mcp6n11 instrumentation amplifier

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    2011 Microchip Technology Inc. DS25073A-page 1

    MCP6N11

    Features

    Rail-to-Rail Input and Output

    Gain Set by 2 External Resistors

    Minimum Gain (GMIN) Options:

    1, 2, 5, 10 or 100 V/V

    Common Mode Rejection Ratio (CMRR): 115 dB

    (typical, GMIN = 100)

    Power Supply Rejection Ratio (PSRR): 112 dB

    (typical, GMIN = 100)

    Bandwidth: 500 kHz (typical, Gain = GMIN)

    Supply Current: 800A/channel (typical)

    Single Channel

    Enable/VOSCalibration pin: (EN/CAL)

    Power Supply: 1.8V to 5.5V

    Extended Temperature Range: -40C to +125C

    Typical Applications

    High Side Current Sensor

    Wheatstone Bridge Sensors

    Difference Amplifier with Level Shifting

    Power Control Loops

    Design Aids

    Microchip Advanced Part Selector (MAPS)

    Demonstration Board

    Application Notes

    Block Diagram

    Description

    Microchip Technology Inc. offers the single MCP6N11

    instrumentation amplifier (INA) with Enable/VOSCali-

    bration pin (EN/CAL) and several minimum gain

    options. It is optimized for single-supply operation with

    rail-to-rail input (no common mode crossover distor-

    tion) and output performance.

    Two external resistors set the gain, minimizing gain

    error and drift-over temperature. The reference voltage

    (VREF) shifts the output voltage (VOUT).

    The supply voltage range (1.8V to 5.5V) is low enough

    to support many portable applications. All devices arefully specified from -40C to +125C.

    These parts have five minimum gain options (1, 2, 5, 10

    and 100 V/V). This allows the user to optimize the input

    offset voltage and input noise for different applications.

    Typical Application Circuit

    Package Types

    RF VFG

    VOUT

    Low Power

    VSSVDD

    EN/CAL

    VOUT

    VOS Calibration

    VREF

    RM4

    GM2 I2VREF

    I4

    GM3

    I3

    VTR

    RG

    VIP

    VIM

    GM1

    I1VIP

    VIM

    POR

    10VDD

    IDD

    VBAT+1.8V

    to+5.5V

    VOUT

    VREF

    VFG

    RF

    RG

    200 k

    10 k

    U1

    MCP6N11

    MCP6N11

    SOIC

    VIP

    VIM

    VSS

    VDD

    VOUT

    1

    2

    3

    4

    8

    7

    6

    5 VREF

    EN/CALVFG

    MCP6N11

    23 TDFN *

    VIP

    VIM

    VSS

    VDD

    VOUT

    1

    2

    3

    4

    8

    7

    6

    5 VREF

    EN/CALVFG

    * Includes Exposed Thermal Pad (EP); see Table 3-1.

    EP

    9

    500 kHz, 800 A Instrumentation Amplifier

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    DS25073A-page 2 2011 Microchip Technology Inc.

    Minimum Gain Options

    Table 1 shows key specifications that differentiate

    between the different minimum gain (GMIN) options.

    See Section 1.0 Electrical Characteristics,

    Section 6.0 Packaging Information and Product

    Identification Systemfor further information on GMIN.

    TABLE 1: KEY DIFFERENTIATING SPECIFICATIONS

    Part No.

    GMIN(V/V)

    Nom.

    VOS(mV)

    Max.

    VOS/TA(V/C)

    Typ.

    CMRR (dB)

    Min.

    VDD = 5.5V

    PSRR

    (dB)

    Min.

    VDMH(V)

    Max.

    GBWP

    (MHz)

    Nom.

    Eni(VP-P)

    Nom.

    (f = 0.1 to 10 Hz)

    eni(nV/Hz)

    Nom.

    (f = 10 kHz)

    MCP6N11-001 1 3.0 90 70 62 2.70 0.50 570 950

    MCP6N11-002 2 2.0 45 78 68 1.35 1.0 285 475

    MCP6N11-005 5 0.85 18 80 75 0.54 2.5 114 190

    MCP6N11-010 10 0.50 9.0 81 81 0.27 5.0 57 95

    MCP6N11-100 100 0.35 2.7 88 86 0.027 35 18 35

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    2011 Microchip Technology Inc. DS25073A-page 3

    MCP6N11

    1.0 ELECTRICALCHARACTERISTICS

    1.1 Absolute Maximum Ratings

    VDD VSS .......................................................................6.5V

    Current at Input Pins ...............................................2 mA

    Analog Inputs (VIPand VIM) ..... VSS 1.0V to VDD + 1.0V

    All Other Inputs and Outputs ......... VSS 0.3V to VDD + 0.3V

    Difference Input Voltage....................................... |VDD VSS|

    Output Short Circuit Current .............. ................ ..Continuous

    Current at Output and Supply Pins ............................30 mA

    Storage Temperature .............. ............... ...... -65C to +150C

    Max. Junction Temperature ...................... ............... ... +150C

    ESD protection on all pins (HBM, CDM, MM) . 2 kV, 1.5 kV, 300V

    Notice:Stresses above those listed under Absolute

    Maximum Ratings may cause permanent damage to

    the device. This is a stress rating only and functional

    operation of the device at those or any other

    conditions above those indicated in the operational

    listings of this specification is not implied. Exposure to

    maximum rating conditions for extended periods may

    affect device reliability. See Section 4.2.1.2 Input Voltage Limits and

    Section 4.2.1.3 Input Current Limits.

    1.2 Specifications

    TABLE 1-1: DC ELECTRICAL SPECIFICATIONS

    Electrical Characteristics: Unless otherwise indicated, TA = +25C, VDD = 1.8V to 5.5V, VSS= GND, EN/CAL = VDD,

    VCM = VDD/2, VDM = 0V, VREF = VDD/2, VL = VDD/2, RL = 1 0 kto VLand GDM = GMIN; see Figure 1-6and Figure 1-7.

    Parameters Sym Min Typ Max Units GMIN Conditions

    Input Offset

    Input Offset Voltage,

    Calibrated

    VOS -3.0 +3.0 mV 1 (Note 2)

    -2.0 +2.0 mV 2

    -0.85 +0.85 mV 5

    -0.50 +0.50 mV 10

    -0.35 +0.35 mV 100

    Input Offset Voltage

    Trim Step

    VOSTRM 0.36 mV 1

    0.21 mV 2

    0.077 mV 5

    0.045 mV 10

    0.014 mV 100

    Input Offset Voltage

    Drift

    VOS/TA 90/GMIN V/C 1 to 10 TA= -40C to +125C(Note 3) 2.7 V/C 100

    Power Supply

    Rejection Ratio

    PSRR 62 82 dB 1

    68 88 dB 2

    75 96 dB 5

    81 102 dB 10

    86 112 dB 100

    Note 1: VCM= (VIP+ VIM) / 2, VDM= (VIP VIM) and GDM= 1 + RF/RG.

    2: The VOSspec limits include 1/f noise effects.

    3: This is the input offset drift without VOS re-calibration; toggle EN/CAL to minimize this effect.4: These specs apply to both the VIP, VIMinput pair (use VCM) and to the VREF, VFGinput pair (VREFtakes VCMs place).

    5: This spec applies to the VIP, VIM, VREFand VFGpins individually.

    6: Figure 2-11and Figure 2-19show the VIVRand VDMRvariation over temperature.

    7: See Section 1.5 Explanation of DC Error Specs.

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    Input Current and Impedance (Note 4)

    Input Bias Current IB 10 pA all

    Across Temperature 80 pA TA= +85C

    Across Temperature 0 2 5 nA TA= +125C

    Input Offset Current IOS 1 pA

    Across Temperature 5 pA TA= +85C

    Across Temperature -1 0.05 +1 nA TA= +125C

    Common Mode Input

    Impedance

    ZCM 1013||6 ||pF

    Differential Input

    Impedance

    ZDIFF 1013||3 ||pF

    Input Common Mode Voltage (VCMor VREF) (Note 4)

    Input Voltage Range VIVL VSS 0.2 V all (Note 5, Note 6)

    VIVH VDD + 0.15 V

    Common Mode

    Rejection Ratio

    CMRR 62 79 dB 1 VCM= VIVLto VIVH,

    VDD = 1.8V69 87 dB 2

    75 101 dB 5

    79 107 dB 10

    86 119 dB 100

    70 94 dB 1 VCM= VIVLto VIVH,

    VDD = 5.5V78 100 dB 2

    80 108 dB 5

    81 114 dB 10

    88 115 dB 100

    Common ModeNon-Linearity

    INLCM -1000 115 +1000 ppm 1 VCM= VIVLto VIVH,VDM = 0V,

    VDD = 1.8V (Note 7)-570 27 +570 ppm 2

    -230 11 +230 ppm 5

    -125 6 +125 ppm 10

    -50 2 +50 ppm 100

    -400 42 +400 ppm 1 VCM= VIVLto VIVH,

    VDM = 0V,

    VDD = 5.5V (Note 7)-220 10 +220 ppm 2

    -100 4 +100 ppm 5

    -50 2 +50 ppm 10

    -30 1 +30 ppm 100

    TABLE 1-1: DC ELECTRICAL SPECIFICATIONS (CONTINUED)

    Electrical Characteristics: Unless otherwise indicated, TA = +25C, VDD = 1.8V to 5.5V, VSS= GND, EN/CAL = VDD,

    VCM = VDD/2, VDM = 0V, VREF = VDD/2, VL = VDD/2, RL = 1 0 kto VLand GDM = GMIN; see Figure 1-6and Figure 1-7.

    Parameters Sym Min Typ Max Units GMIN Conditions

    Note 1: VCM= (VIP+ VIM) / 2, VDM= (VIP VIM) and GDM= 1 + RF/RG.

    2: The VOSspec limits include 1/f noise effects.3: This is the input offset drift without VOS re-calibration; toggle EN/CAL to minimize this effect.

    4: These specs apply to both the VIP, VIMinput pair (use VCM) and to the VREF, VFGinput pair (VREFtakes VCMs place).

    5: This spec applies to the VIP, VIM, VREFand VFGpins individually.

    6: Figure 2-11and Figure 2-19show the VIVRand VDMRvariation over temperature.

    7: See Section 1.5 Explanation of DC Error Specs.

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    2011 Microchip Technology Inc. DS25073A-page 5

    MCP6N11

    Input Differential Mode Voltage (VDM) (Note 4)

    Differential Input

    Voltage Range

    VDML -2.7/GMIN V all VREF= (VDD GDMVDM)/2

    (Note 6)VDMH +2.7/GMIN V

    Differential Gain Error gE -1 0.13 +1 % VDM= VDMLto VDMH,

    Differential Gain Drift gE/TA 0.0006 %/C VREF= (VDD GDMVDM)/2

    Differential

    Non-Linearity

    INLDM -500 30 +500 ppm 1 (Note 7)

    -800 40 +800 ppm 2, 5

    -2000 100 +2000 ppm 10, 100

    DC Open-Loop Gain AOL 61 84 dB 1 VDD = 1.8V,

    68 90 dB 2 VOUT = 0.2V to 1.6V

    76 98 dB 5

    78 104 dB 10

    86 116 dB 100

    70 94 dB 1 VDD = 5.5V,

    77 100 dB 2 VOUT = 0.2V to 5.3V

    84 108 dB 5

    90 114 dB 10

    97 125 dB 100

    Output

    Minimum Output

    Voltage Swing

    VOL VSS + 15 mV all VDM = -VDD/(2GDM),

    VDD = 1.8V,

    VREF= VDD/2 1V

    VSS + 25 mV VDM = -VDD/(2GDM),

    VDD = 5.5V,

    VREF= VDD/2 1VMaximum Output

    Voltage Swing

    VOH VDD 15 mV VDM = VDD/(2GDM),VDD = 1.8V,

    VREF= VDD/2 + 1V

    VDD 25 mV VDM = VDD/(2GDM),VDD = 5.5V,

    VREF= VDD/2 + 1V

    Output Short Circuit

    Current

    ISC 8 mA VDD= 1.8V

    30 mA VDD= 5.5V

    Power Supply

    Supply Voltage VDD 1.8 5.5 V all

    Quiescent Current

    per Amplifier

    IQ 0.5 0.8 1.1 mA IO= 0

    POR Trip Voltage VPRL 1.1 1.4 V

    VPRH 1.4 1.7 V

    TABLE 1-1: DC ELECTRICAL SPECIFICATIONS (CONTINUED)

    Electrical Characteristics: Unless otherwise indicated, TA = +25C, VDD = 1.8V to 5.5V, VSS= GND, EN/CAL = VDD,

    VCM = VDD/2, VDM = 0V, VREF = VDD/2, VL = VDD/2, RL = 1 0 kto VLand GDM = GMIN; see Figure 1-6and Figure 1-7.

    Parameters Sym Min Typ Max Units GMIN Conditions

    Note 1: VCM= (VIP+ VIM) / 2, VDM= (VIP VIM) and GDM= 1 + RF/RG.

    2: The VOSspec limits include 1/f noise effects.

    3: This is the input offset drift without VOS re-calibration; toggle EN/CAL to minimize this effect.

    4: These specs apply to both the VIP, VIMinput pair (use VCM) and to the VREF, VFGinput pair (VREFtakes VCMs place).

    5: This spec applies to the VIP, VIM, VREFand VFGpins individually.

    6: Figure 2-11and Figure 2-19show the VIVRand VDMRvariation over temperature.

    7: See Section 1.5 Explanation of DC Error Specs.

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    TABLE 1-2: AC ELECTRICAL SPECIFICATIONS

    Electrical Characteristics: Unless otherwise indicated, TA = 25C, VDD = 1.8V to 5.5V, VSS= GND,

    EN/CAL = VDD, VCM = VDD/2, VDM = 0V, VREF = VDD/2, VL = VDD/2, RL = 1 0 kto VL, CL = 60 pF and GDM = GMIN;

    see Figure 1-6and Figure 1-7.

    Parameters Sym Min Typ Max Units GMIN Conditions

    AC ResponseGain Bandwidth

    Product

    GBWP 0.50 GMIN MHz 1 to 10

    35 MHz 100

    Phase Margin PM 70 all

    Open-Loop Output

    Impedance

    ROL 0.9 k 1 to 10

    0.6 k 100

    Power Supply

    Rejection Ratio

    PSRR 94 dB all f < 10 kHz

    Common Mode

    Rejection Ratio

    CMRR 104 dB 1 to 10 f < 10 kHz

    94 dB 100 f < 10 kHz

    Step Response

    Slew Rate SR 3 V/s 1 to 10 VDD = 1.8V 9 V/s VDD = 5.5V

    2 V/s 100 VDD = 1.8V

    6 V/s VDD = 5.5V

    Overdrive Recovery,

    Input Common Mode

    tIRC 10 s all VCM = VSS 1V (or VDD + 1V) to VDD/2,

    GDMVDM = 0.1V, 90% of VOUTchange

    Overdrive Recovery,

    Input Differential

    Mode

    tIRD 5 s VDM = VDML (0.5V)/GMIN(or VDMH + (0.5V)/GMIN) to 0V,

    VREF = (VDD GDMVDM)/2,

    90% of VOUTchange

    Overdrive Recovery,

    Output

    tOR 8 s GDM = 2GMIN, GDMVDM = 0.5VDDto 0V,

    VREF = 0.75VDD(or 0.25VDD),

    90% of VOUT

    change

    Noise

    Input Noise Voltage Eni 570/GMIN VP-P 1 to 10 f = 0.1 Hz to 10 Hz

    18 VP-P 100

    Input Noise Voltage

    Density

    eni 950/GMIN nV/Hz 1 to 10 f = 100 kHz

    35 nV/Hz 100

    Input Current Noise

    Density

    ini 1 fA/Hz all f = 1 kHz

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    MCP6N11

    TABLE 1-3: DIGITAL ELECTRICAL SPECIFICATIONS

    Electrical Characteristics: Unless otherwise indicated, TA = 25C, VDD = 1.8V to 5.5V, VSS= GND, EN/CAL = VDD,

    VCM= VDD/2, VDM = 0V, VREF = VDD/2, VL = VDD/2, RL = 1 0 kto VL, CL = 60 pF and GDM = GMIN;see Figure 1-6and Figure 1-7.

    Parameters Sym Min Typ Max Units GMIN Conditions

    EN/CAL Low SpecificationsEN/CAL Logic

    Threshold, Low

    VIL VSS 0.2 VDD V all

    EN/CAL Input Current,

    Low

    IENL -0.1 nA EN/CAL = 0V

    GND Current ISS -7 -2.5 A EN/CAL = 0V, VDD = 5.5V

    Amplifier Output Leakage IO(LEAK) 10 nA EN/CAL = 0V

    EN/CAL High Specifications

    EN/CAL Logic

    Threshold, High

    VIH 0.8 VDD VDD V all

    EN/CAL Input Current,

    High

    IENH -0.01 nA EN/CAL = VDD

    EN/CAL Dynamic Specifications

    EN/CAL Input Hysteresis VHYST 0.2 V all

    EN/CAL Low to Amplifier

    Output High-Z Turn-off

    Time

    tOFF 3 10 s EN/CAL = 0.2VDDto VOUT= 0.1(VDD/2),

    VDMGDM= 1 V, VL = 0V

    EN/CAL High to

    Amplifier Output

    On Time

    tON 12 20 28 ms EN/CAL = 0.8VDDto VOUT= 0.9(VDD/2),

    VDMGDM= 1 V, VL = 0V

    EN/CAL Low to

    EN/CAL High low time

    tENLH 100 s Minimum time before externally

    releasing EN/CAL (Note 1)

    Amplifier On to

    EN/CAL Low Setup Time

    tENOL 100 s

    POR Dynamic Specifications

    VDDto Output Off tPHL 10 s all VL = 0V, VDD = 1.8V toVPRL 0.1V step,

    90% of VOUTchange

    VDDto Output On tPLH 140 250 360 ms VL = 0V, VDD = 0V to VPRH + 0.1V step,90% of VOUTchange

    Note 1: For design guidance only; not tested.

    TABLE 1-4: TEMPERATURE SPECIFICATIONS

    Electrical Characteristics: Unless otherwise indicated, all limits are specified for: VDD = 1.8V to 5.5V, VSS = GND.

    Parameters Sym Min Typ Max Units Conditions

    Temperature Ranges

    Specified Temperature Range TA -40 +125 C

    Operating Temperature Range TA -40 +125 C (Note 1)

    Storage Temperature Range TA -65 +150 C

    Thermal Package Resistances

    Thermal Resistance, 8L-SOIC JA 150 C/W

    Thermal Resistance, 8L-TDFN (23) JA 53 C/W

    Note 1: Operation must not cause TJto exceed the Absolute Maximum Junction Temperature specification (+150C).

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    DS25073A-page 8 2011 Microchip Technology Inc.

    1.3 Timing Diagrams

    FIGURE 1-1: Common Mode Input

    Overdrive Recovery Timing Diagram.

    FIGURE 1-2: Differential Mode Input

    Overdrive Recovery Timing Diagram.

    FIGURE 1-3: Output Overdrive Recovery

    Timing Diagram.

    FIGURE 1-4: POR Timing Diagram.

    FIGURE 1-5: EN/CAL Timing Diagram.

    VOUT

    tIRC

    VDM

    VCM

    (1V)/GDM

    VOUT

    tIRD

    VCM

    VDM

    VDD/2

    VOUT

    tOR

    VCM

    VDM

    VDD/2

    1.8V

    VPRL 0.1V

    High-ZVOUT

    VDD

    tPHLtPLH

    VPRH + 0.1V

    0V

    High-ZVOUT

    EN/CAL

    tOFFtON

    tENLH

    tENOL

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    MCP6N11

    1.4 DC Test Circuits

    1.4.1 INPUT OFFSET TEST CIRCUIT

    Figure 1-6 is used for testing the INAs input offset

    errors and input voltage range (VE, VIVLand VIVH; see

    Section 1.5.1 Input Offset Related Errors and

    Section 1.5.2 Input Offset Common Mode Non-

    linearity). U2is part of a control loop that forces VOUTto equal VCNT; U1can be set to any bias point.

    FIGURE 1-6: Test Circuit for Common

    Mode (Input Offset).

    When MCP6N11 is in its normal range of operation, theDC output voltages are (where VEis the sum of input

    offset errors and gEis the gain error):

    EQUATION 1-1:

    Table 1-5gives the recommended RFand RGvalues

    for different GMINoptions.

    1.4.2 DIFFERENTIAL GAIN TEST CIRCUIT

    Figure 1-7is used for testing the INAs differential gain

    error, non-linearity and input voltage range (gE, INLDM,

    VDMLand VDMH; see Section 1.5.3 Differential Gain

    Error and Non-linearity). RFand RGare 0.01% for

    accurate gain error measurements.

    FIGURE 1-7: Test Circuit for Differential

    Mode.

    The output voltages are (where VEis the sum of input

    offset errors and gEis the gain error):

    EQUATION 1-2:

    To keep VREF, VFGand VOUTwithin their ranges, set:

    EQUATION 1-3:

    Table 1-6shows the recommended RFand RG. They

    produce a 10 kload; VLcan usually be left open.

    TABLE 1-5: SELECTING RFAND RGGMIN(V/V)

    Nom.

    RF()

    Nom.

    RG()

    Nom.

    GDM(V/V)

    Nom.

    GDMVOS(V)

    Max.

    BW

    (kHz)

    Nom.

    1 100k 499 201.4 0.60 2.5

    2 0.40 5.0

    5 100k 100 1001 0.85 2.5

    10 0.50 5.0

    100 0.35 35

    RL

    VCM 100 nF

    VDD

    2.2 F

    VREF

    VL

    12.7 kVM

    100 nF CCNT

    U1

    MCP6N11

    U2

    MCP6H01

    VCNT

    63.4 k

    RG

    RF

    RCNT63.4 k

    VOUT

    10 nF

    1 k

    1 k

    GDM 1 RF RG+=

    VOU T VCN T=

    VM VRE F GDM1 gE+( )VE+=

    TABLE 1-6: SELECTING RFAND RG

    GMIN(V/V)

    Nom.

    RF()Nom.

    RG()Nom.

    GDM(V/V)

    Nom.

    1 0 Open 1.000

    2 4.99k 4.99k 2.000

    5 8.06k 2.00k 5.030

    10 9.09k 1.00k 10.09

    100 10.0k 100 101.0

    RL

    6.34 k

    1 k

    1 k

    VCM + VDM/2

    +

    100 nF

    VOUT

    RF

    RG

    VM

    100 nF

    VDD

    2.2 F

    6.34 k

    VREF

    VFG

    VL

    VCM VDM/2

    0.01%

    0.01%

    U1

    MCP6N11

    GDM 1 RF RG+=

    VM

    VOU T

    VRE F

    =

    VOU T VRE F GDM1 gE+( ) VDM VE+( )+=

    GDM1 gE+( ) VDM VE+( )=

    VRE F VDD GDMVDM( ) 2=

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    1.5 Explanation of DC Error Specs

    1.5.1 INPUT OFFSET RELATED ERRORS

    The input offset error (VE) is extracted from input offset

    measurements (see Section 1.4.1 Input Offset Test

    Circuit), based on Equation 1-1:

    EQUATION 1-4:

    VEhas several terms, which assume a linear response

    to changes in VDD, VSS, VCM, VOUTand TA(all of which

    are in their specified ranges):

    EQUATION 1-5:

    Equation 1-2shows how VEaffects VOUT.

    1.5.2 INPUT OFFSET COMMON MODE

    NON-LINEARITY

    The input offset error (VE) changes non-linearly with

    VCM. Figure 1-8shows VEvs. VCM, as well as a linearfit line (VE_LIN) based on VOSand CMRR. The op amp

    is in standard conditions (VOUT = 0, VDM = 0, etc.).VCM is swept from VIVL to VIVH. The test circuit is in

    Section 1.4.1 Input Offset Test Circuitand VE is

    calculated using Equation 1-4.

    FIGURE 1-8: Input Offset Error vs.

    Common Mode Input Voltage.

    Based on the measured VE data, we obtain the

    following linear fit:

    EQUATION 1-6:

    The remaining error (VE) is described by the CommonMode Non-Linearity spec:

    EQUATION 1-7:

    The same common mode behavior applies to VEwhen

    VREFis swept, instead of VCM, since both input stages

    are designed the same:

    EQUATION 1-8:

    1.5.3 DIFFERENTIAL GAIN ERROR ANDNON-LINEARITY

    The differential errors are extracted from differential

    gain measurements (see Section 1.4.2 Differential

    Gain Test Circuit), based on Equation 1-2. These

    errors are the differential gain error (gE) and the input

    offset error (VE, which changes non-linearly with VDM):

    EQUATION 1-9:

    These errors are adjusted for the expected output, then

    referred back to the input, giving the differential input

    error (VED) as a function of VDM:

    EQUATION 1-10:

    VEVM VRE F

    GDM1 gE+( )---------------------------------=

    Where:

    PSRR, CMRRandAOLare in units of V/V

    TAis in units of C

    VDM= 0

    VE VOS

    VDD VSS

    PSRR---------------------------------

    VCM

    CMRR-----------------

    VRE F

    CMRR-----------------+ + +=

    VOU TAOL

    ----------------- TAVOSTA

    -------------+ +

    V1

    V3

    VE, VE_LIN(V)

    VCM(V)

    VIVL VIVHVDD/2

    V2

    VE_LIN

    VE

    VE

    Where:

    VE_ LI N VOS

    VCM VDD 2

    CMRR-----------------------------------+=

    VOS V2=

    1

    CMRR-----------------

    V3 V1

    VIV H VIV L------------------------------=

    Where:

    INLCM

    max VE

    VIV H VIV L------------------------------=

    VE VE VE_ LI N

    =

    VE_ LI N VOSVRE F VDD 2

    CMRR-------------------------------------+=

    INLCMma x VE

    VIV H VIV L------------------------------=

    GDM 1 RF RG+=

    VM GDM1 gE+( ) VDM V+ E( )=

    VEDVM

    GDM------------ VDM=

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    MCP6N11

    Figure 1-9shows VEDvs. VDM, as well as a linear fit

    line (VED_LIN) based on VEand gE. The op amp is in

    standard conditions (VOUT = 0, etc.). VDM is sweptfrom VDMLto VDMH.

    FIGURE 1-9: Differential Input Error vs.

    Differential Input Voltage.

    Based on the measured VED data, we obtain the

    following linear fit:

    EQUATION 1-11:

    Note that the VE value measured here is not asaccurate as the one obtained in Section 1.5.1 Input

    Offset Related Errors.

    The remaining error (VED) is described by theDifferential Mode Non-Linearity spec:

    EQUATION 1-12:

    V1

    V3

    VED, VED_LIN(V)

    VDM(V)

    VDML VDMH0

    V2

    VED_LIN

    VED

    VED

    Where:

    VED _L IN 1 gE+( )VE gEVDM+=

    gE

    V3 V1

    VDM H VDM L----------------------------------- 1=

    VEV2

    1 gE+----------------=

    Where:

    INLDM

    max VED

    VDM H VDM L-----------------------------------=

    VED VED VED _L IN=

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    NOTES:

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    MCP6N11

    2.0 TYPICAL PERFORMANCE CURVES

    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    2.1 DC Voltages and Currents

    FIGURE 2-1: Normalized Input Offset

    Voltage, with GMIN= 1 to 10.

    FIGURE 2-2: Normalized Input Offset

    Voltage, with GMIN= 100.

    FIGURE 2-3: Normalized Input Offset

    Voltage Drift, with GMIN= 1 to 10.

    FIGURE 2-4: Normalized Input Offset

    Voltage Drift, with GMIN= 100.

    Note: The graphs and tables provided following this note are a statistical summary based on a limited number of

    samples and are provided for informational purposes only. The performance characteristics listed herein

    are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified

    operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

    30%

    35%

    es

    330 SamplesTA =

    25%

    30%

    rrence TA +25C

    VDD = 1.8V and 5.5VRTO

    20%fOccu

    GMIN = 1=

    10%

    15%

    tageof MIN

    5%

    10%

    Percent

    0%

    P

    -2.

    -1.

    -1.

    -0.

    -0.

    0.

    0.

    0.

    1.

    1.

    2.

    Normalized Input Offset Voltage; GMINVOS(mV)

    14%

    s330 SamplesGMIN = 100

    10%rrence

    MIN

    TA = +25CVDD = 1.8V and 5.5VRTO

    8%Occu

    6%

    ageo

    2%

    4%

    erce

    n

    0%

    -18

    -16

    -14

    -12

    -10 -8 -6 -4 -2 0 2 4 6 81

    012141618

    Normalized Input Offset Voltage; GMINVOS(mV)

    25%

    es No VOS Re-calibration

    330 Samples

    20%

    urren GMIN = 1 to 10

    VDD = 5.5VRTO

    15%

    ofOc

    10%

    ntage

    5%

    Perce

    0%

    600

    500

    400

    300

    200

    100 0

    100

    200

    300

    400

    500

    600

    - - - - - -Normalized Input Offset Voltage Drift;

    GMIN(VOS/TA) (V/C)

    16%

    18%

    ces No VOS Re-calibration

    330 Samples

    12%

    14%

    curren GMIN = 100

    VDD = 5.5VRTO

    8%

    10%

    ofOc

    6%ntage

    2%Per

    c

    1200

    1000

    -800

    -600

    -400

    -200 0

    200

    400

    600

    800

    1000

    1200

    - -Normalized Input Offset Voltage Drift;

    GMIN(VOS/TA) (V/C)

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-5: Normalized Input Offset

    Voltage vs. Power Supply Voltage, with

    VCM= 0V and GMIN= 1 to 10.

    FIGURE 2-6: Normalized Input Offset

    Voltage vs. Power Supply Voltage, withVCM= 0V and GMIN= 100.

    FIGURE 2-7: Normalized Input Offset

    Voltage vs. Power Supply Voltage, with

    VCM= VDDand GMIN= 1 to 10.

    FIGURE 2-8: Normalized Input Offset

    Voltage vs. Power Supply Voltage, with

    VCM= VDDand GMIN= 100.

    FIGURE 2-9: Normalized Input Offset

    Voltage vs. Output Voltage, with GMIN= 1 to 10.

    FIGURE 2-10: Normalized Input Offset

    Voltage vs. Output Voltage, with GMIN= 100.

    -0.5

    0.0

    0.5

    1.0

    1.5

    2.0

    2.5

    dInputOffsetVoltage;

    GMINV

    OS(m

    V)

    -40C

    -2.5

    -2.0

    -1.5

    -1.0

    0.00.51.01.52.02.53.03.54.04.55.05.56.06.5

    NormalizedG

    Power Supply Voltage

    Representative PartVCM = VSSGMIN = 1 to 10RTO

    +25C+85C

    +125C

    20

    25

    ge

    ;

    15

    tVolt

    5

    tOffse

    S

    (mV)

    -5dInpu

    MIN

    VO

    -15

    -10

    malize

    Representative PartVCM = VSS

    -40C25C

    -25

    -20Nor GMIN = 100

    RTO

    85C125C

    0.0

    0.5

    1.0

    1.5

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    6.0

    6.5

    Power Supply Voltage

    -

    -0.2

    0.0

    0.2

    0.4

    0.6

    0.8

    1.0

    1.2

    dInputOffsetVoltage;

    MINV

    OS

    (mV)

    Representative PartVCM = VDDGMIN = 1 to 10RTO

    -40C+25C+85C+125C

    -1.2

    -1.0

    -0.8

    -0.6

    - .

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5

    Normalize

    Power Supply Voltage

    -2

    0

    2

    4

    6

    8

    10

    dInputOffsetVoltage;

    GMINV

    OS(m

    V)

    Representative PartVCM = VDDGMIN = 100RTO

    -10

    -8

    -6

    -4

    0.00.51.01.52.02.53.03.54.04.55.05.56.06.5

    NormalizedG

    Power Supply Voltage

    -40C+25C+85C+125C

    -0.5

    0.0

    0.5

    1.0

    1.5

    2.0

    dInputOffsetVoltage;

    MINV

    OS

    (mV)

    Representative PartGMIN = 1 to 10RTO

    VDD = 5.5V

    VDD = 1.8V

    -2.0

    -1.5

    -1.0

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

    Normalize

    Output Voltage (V)

    -1

    0

    1

    2

    3

    4

    5

    6

    dInputOffsetVoltage;

    MINV

    OS

    (mV)

    Representative PartGMIN = 100RTO

    VDD = 5.5V

    VDD = 1.8V

    -6

    -5

    -4

    -3

    -

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

    Normalize

    Output Voltage (V)

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-11: Input Common Mode

    Voltage Headroom vs. Ambient Temperature.

    FIGURE 2-12: Normalized Input Offset

    Voltage vs. Common Mode Voltage, withVDD = 1.8V and GMIN= 1 to 10.

    FIGURE 2-13: Normalized Input Offset

    Voltage vs. Common Mode Voltage, with

    VDD = 1.8V and GMIN= 100.

    FIGURE 2-14: Normalized Input Offset

    Voltage vs. Common Mode Voltage, with

    VDD = 5.5V and GMIN= 1 to 10.

    FIGURE 2-15: Normalized Input Offset

    Voltage vs. Common Mode Voltage, withVDD = 5.5V and GMIN= 100.

    FIGURE 2-16: Normalized CMRR and

    PSRR vs. Ambient Temperature.

    0.4

    0.5

    m1 Wafer Lot

    VIVH VDD

    0.2

    0.3

    eadro

    0.1

    .

    nge

    H

    ) VDD = 1.8V

    -0.1

    .

    ageR( VDD = 5.5V

    -0.3

    -0.2

    utVolt

    -0.5

    -0.4Inp VIVL VSS

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    -0.5

    0.0

    0.5

    1.0

    1.5

    2.0

    dInputOffsetVoltage;

    GMINV

    OS

    (mV)

    VDD = 1.8VRepresentative PartGMIN = 1 to 10RTO

    -2.0

    -1.5

    -1.0

    -0.5 0.0 0.5 1.0 1.5 2.0 2.5

    NormalizedG

    Input Common Mode Voltage (V)

    +125C+85C+25C-40C

    -5

    0

    5

    10

    15

    dInputOffsetVoltage;

    GMINV

    OS

    (mV)

    VDD = 1.8VRepresentative PartGMIN = 100RTO

    -15

    -10

    -5

    -0.5 0.0 0.5 1.0 1.5 2.0 2.5

    NormalizedG

    Input Common Mode Voltage (V)

    +125C+85C+25C-40C

    -0.5

    0.0

    0.5

    1.0

    1.5

    2.0

    dInputOffsetVoltage;

    GMINV

    OS(m

    V)

    VDD = 5.5VRepresentative PartGMIN = 1 to 10RTO

    +125C+85

    -2.0

    -1.5

    -1.0

    -0.50.00.51.01.52.02.53.03.54.04.55.05.56.0

    NormalizedG

    Input Common Mode Voltage (V)

    +85C+25C-40C

    -5

    0

    5

    10

    15

    dInputOffsetVoltage;

    GMINV

    OS

    (mV)

    VDD = 5.5VRepresentative PartGMIN = 100RTO

    -15

    -10

    -5

    -0.50.00.51.01.52.02.53.03.54.04.55.05.56.0

    NormalizedG

    Input Common Mode Voltage (V)

    +125C+85C+25C-40C

    105

    110

    B) CMRR / GMIN, VDD = 1.8V:

    G = 1 100

    CMRR / GMIN, VDD = 5.5V:G = 1 to 10

    100

    PSRR;

    MIN

    (d,

    GMIN = 2 to 10 GMIN = 100

    90MRR,

    RR/

    80izedC

    MIN,P

    70

    75

    ormal

    RR/

    PSRR / G :

    60

    65NCM GMIN = 1 to 10

    GMIN = 100

    -50 -25 0 25 50 75 100 125Ambient Temperature (C)

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-17: Normalized DC Open-Loop

    Gain vs. Ambient Temperature.

    FIGURE 2-18: The MCP6N11 Shows No

    Phase Reversal vs. Common Mode Voltage.

    FIGURE 2-19: Normalized Differential

    Mode Voltage Range vs. Ambient Temperature.

    FIGURE 2-20: Normalized Differential Input

    Error vs. Differential Voltage, with GMIN= 1.

    FIGURE 2-21: Normalized Differential Input

    Error vs. Differential Voltage, with

    GMIN= 2 to 100.

    FIGURE 2-22: The MCP6N11 Shows No

    Phase Reversal vs. Differential Voltage, with

    VDD = 5.5V.

    105

    110

    in;

    100

    oopG

    )

    VDD = 5.5VVDD = 1.8V

    90pen

    -L

    IN(d

    B

    80DC

    OL/G

    70

    75

    alize

    GMIN = 1 to 10

    60

    65Nor MIN

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    5.5

    6.0Representative PartV = 5.5V

    4.55.0

    (V)

    G = 100

    3.5

    .

    ltage GDM = 1

    2.0

    2.5

    .

    tputV

    VIM = -0.20V

    1.0

    1.5

    .

    Ou VIM = VDD + 0.15V

    0.0

    0.5

    -1.0-0.50.00.51.01.52.02.53.03.54.04.55.05.56.06.5

    Non-inverting Input Voltage; VIP(V)

    3.8

    4.0

    ut)

    1 Wafer LotGMINVDMH = -GMINVDML

    3.4

    3.6

    ialInp

    DMH

    ( RTO

    3.2

    .

    ferenti

    ;G

    MIN

    2.8

    .

    edDi

    Rang

    2.4

    2.6

    rmali

    ltage

    2.0

    2.2NV Note: For GMIN = 1,VDMH = minimum of plot value and VDD

    -50 -25 0 25 50 75 100 125

    Axis Title

    -2

    -1

    01

    2

    3

    4

    5

    izedDiffer

    entialInput

    ror;G

    MINVE

    D

    (mV)

    Representative PartVED = (VOUT VREF)/GDM VDMGMIN = 1RTO

    VDD = 1.8V

    VDD = 5.5V

    -5

    -4

    -3

    -5 -4 -3 -2 -1 0 1 2 3 4 5

    NormalEr

    Normalized Differential Input Voltage;GMINVDM(V)

    4

    5

    ut Representative Part

    V = V V /G V

    2

    3

    tialIn

    mV) GMIN = 2 to 100

    RTO

    0

    1

    ifferen

    INV

    ED

    (

    -2

    -1

    izedD

    ror;G

    M

    -

    -3ormalEr

    -5

    - - - - -

    N

    Normalized Differential Input Voltage;GMINVDM(V)

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    putVoltage(V)

    Representative PartVDD = 5.5VVREF = (VDD GDMVDM)/2

    0.0

    0.5

    1.0

    1.5

    -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7

    Ou

    Differential Input Voltage (V)

    GMIN = 1GMIN = 2GMIN = 5GMIN = 10GMIN = 100

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-23: Input Bias and Offset

    Currents vs. Ambient Temperature, with

    VDD = +5.5V.

    FIGURE 2-24: Input Bias Current vs.

    Input Voltage (below VSS).

    FIGURE 2-25: Input Bias and Offset

    Currents vs. Common Mode Input Voltage, with

    TA = +85C.

    FIGURE 2-26: Input Bias and Offset

    Currents vs. Common Mode Input Voltage, with

    TA = +125C.

    FIGURE 2-27: Output Voltage Headroom

    vs. Output Current.

    FIGURE 2-28: Output Voltage Headroom

    vs. Ambient Temperature.

    1.E-10

    1.E-09

    1.E-08

    ,OffsetCurrents(A) VDD = 5.5V

    VCM = VDD

    IB100p

    1n

    10n

    1.E-12

    1.E-11

    25 45 65 85 105 125

    InputBia

    Ambient Temperature (C)

    | IOS |

    1p

    10p

    1 E 09

    1.E-08

    1.E-07

    1.E-06

    1.E-05

    1.E-04

    1.E-03

    urrentMagnitude(A)

    +125C+85C+25C-40

    1m

    100

    10

    1

    100n

    10n

    1n

    1.E-12

    1.E-11

    1.E-10

    1.E-09

    -1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0

    InputCu

    Input Voltage (V)

    -40 C1n

    100p

    10p

    1p

    -20

    0

    20

    40

    60

    80

    100

    s,OffsetCurrents(pA) Representative Part

    TA = +85CVDD = 5.5V

    IB

    IOS

    -100

    -80

    -60

    -40

    0.0

    0.5

    1.0

    1.5

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    6.0

    InputBias

    Common Mode Input Voltage (V)

    1 0

    -0.5

    0.0

    0.5

    1.0

    1.5

    2.0

    2.5

    s,OffsetCurrents(nA) Representative Part

    TA = +125CVDD = 5.5V

    IB

    IOS

    -2.5

    -2.0

    -1.5

    -1.0

    0.0

    0.5

    1.0

    1.5

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    6.0

    InputBias

    Common Mode Input Voltage (V)

    1000

    V)

    om(

    VDD = 5.5V

    eadr DD

    = .

    ltage VDD VOH

    putVo VOL VSS

    10

    Out

    0.1 1 10Output Current Magnitude (mA)

    9

    10

    8

    (mV)

    VDD VOH

    6room VDD = 5.5V

    4tHea

    2

    3

    Outpu VDD = 1.8V

    0

    1VOL VSS

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-29: Output Short Circuit Current

    vs. Power Supply Voltage.

    FIGURE 2-30: Supply Current vs. Power

    Supply Voltage.

    FIGURE 2-31: Supply Current vs. Common

    Mode Input Voltage.

    -10

    0

    10

    20

    30

    40

    50

    ortCircuitCurrent(mA)

    +125C+85C+25C-40C

    -50

    -40

    -30

    -20

    0.00.51.01.52.02.53.03.54.04.55.05.56.06.5

    OutputSho

    Power Supply Voltage (V)

    400

    500

    600

    700

    800

    900

    1000

    1100

    plyCurrent(A)

    +125C+85C+25C40

    0

    100

    200

    300

    0.00.51.01.52.02.53.03.54.04.55.05.56.06.5

    Sup

    Power Supply Voltage (V)

    -40C

    1000

    1100

    800

    900

    A) VDD = 5.5V

    600

    700

    rren

    t(

    VDD = 1.8V

    400

    500

    plyCu

    200

    300Sup

    0

    100

    -0.50.00.51.01.52.02.53.03.54.04.55.05.56.0

    Common Mode Input Voltage (V)

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    2.2 Frequency Response

    FIGURE 2-32: CMRR vs. Frequency.

    FIGURE 2-33: PSRR vs. Frequency.

    FIGURE 2-34: Normalized Open-Loop

    Gain vs. Frequency.

    FIGURE 2-35: Normalized Gain Bandwidth

    Product and Phase Margin vs. Ambient

    Temperature.

    FIGURE 2-36: Closed-Loop Output

    Impedance vs. Frequency.

    FIGURE 2-37: Gain Peaking vs.

    Normalized Capacitive Load.

    40

    50

    60

    70

    80

    90

    100

    CMRR(dB)

    G = 1

    VDD = 5.5V

    0

    10

    20

    30

    1.E+03 1.E+04 1.E+05 1.E+06

    Frequency (Hz)

    GMIN = 2GMIN = 5

    GMIN = 10GMIN = 100

    1k 10k 100k 1M

    110

    120VDD = 5.5V

    90

    100

    70

    80

    (dB)

    50PSR

    20

    30GMIN = 1GMIN = 2G = 5

    0

    10GMIN = 10

    GMIN = 100

    1.E+03 1.E+04 1.E+05 1.E+06

    Frequency (Hz)

    1k 10k 100k 1M

    -90

    -60

    100

    120

    nn

    -

    -12080pGai

    ()p

    Gai

    N

    (dB)

    AOL/GMIN

    -18040en-Lo

    L/G

    MIN

    en-Lo

    OL/G

    MI

    | AOL/GMIN |

    -240

    -

    0edO

    se;A

    edO

    ude;

    -300

    -270

    -40

    -20

    rmaliPh

    rmali

    Magnit

    GMIN = 1GMIN = 2

    =

    -360

    -330

    -80

    -60 NNMIN

    GMIN = 10

    GMIN = 100

    1.E+4 1.E+5 1.E+6 1.E+7

    Frequency (Hz)

    10k 100k 1M 10M

    140

    150

    0.45

    0.50

    )

    1300.40

    )ndwith

    (MHz

    1100.30

    .

    argin(

    ainBa

    P/G

    MI

    GMIN = 1GMIN = 2 GBWP

    900.20

    .

    aseM

    izedG

    ;GB

    GMIN = 5GMIN = 10

    GMIN = 100 PM

    70

    80

    0.10

    0.15 Ph

    ormal

    roduc

    50

    60

    0.00

    0.05NP

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    1.E+04

    ce

    10k

    pedan

    G /G = 10 GMIN = 1 to 10

    1.E+03

    putIm

    )

    1k

    opOu( GMIN = 100

    . +

    ed-Lo

    +Clo

    GDM/GMIN = 1.

    1.E+03 1.E+04 1.E+05 1.E+06 1.E+07

    Frequency (Hz)

    1k 10k 100k 1M 10M

    7

    G = G = 1 GMIN = 10

    5B)

    = 2= 5

    = 10

    GDM = 20= 50

    4ing(d = 100

    3nPea GMIN = 100

    GDM = 200= 500

    2Gai

    1

    1.E+1 1.E+2 1.E+3Normalized Capacitive Load; CL(GMIN/GDM) (F)

    10p 100p 1n

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    2.3 Noise

    FIGURE 2-38: Normalized Input Noise

    Voltage Density vs. Frequency.

    FIGURE 2-39: Normalized Input NoiseVoltage Density vs. Input Common Mode

    Voltage, with f = 100 Hz.

    FIGURE 2-40: Normalized Input Noise

    Voltage Density vs. Input Common Mode

    Voltage, with f = 10 kHz.

    FIGURE 2-41: Normalized Input Noise

    Voltage vs. Time, with GMIN= 1 to 10.

    FIGURE 2-42: Normalized Input NoiseVoltage vs. Time, with GMIN= 100.

    1000

    ge

    1mRTO

    100eVolt

    /Hz)

    100

    tNois

    Neni(V GMIN = 100

    dInpu

    ty;G

    MI

    1

    maliz

    Densi

    1GMIN = 10

    GMIN = 5G = 2

    0.1Nor

    100n

    GMIN = 1

    1.E-1 1.E+0 1.E+1 1.E+2 1.E+3 1.E+4 1.E+5 1.E+6

    Frequency (Hz)

    0.1 100 1k1 10 100k 1M10k

    14

    e

    10Voltag

    Hz)

    =

    8Noise

    ni(V/

    VDD = 1.8VVDD = 5.5V

    MIN GMIN = 10GMIN = 5

    =

    6Input

    ;G

    MINe MIN

    GMIN = 1

    4

    alized

    ensity

    0NorD f = 100 Hz

    RTO

    -0.50.00.51.01.52.02.53.03.54.04.55.05.56.0

    Common Mode Input Voltage (V)

    4.0

    e

    3.0

    .

    Voltag

    Hz)

    2.5

    Noise

    ni(V/

    VDD = 1.8VVDD = 5.5V

    GMIN = 100GMIN = 10GMIN = 5

    1.5

    .

    Input

    ;G

    MINe GMIN = 2

    GMIN = 1

    1.0

    alized

    ensity

    0.0

    .

    No

    rD f = 10 kHz

    RTO

    -0.50.00.51.01.52.02.53.03.54.04.55.05.56.0

    Common Mode Input Voltage (V)

    0.4

    0.5Representative PartGMIN = 1 to 10

    Analog NPBW = 0.1 HzSample Rate = 4 SPS

    0.3

    oise;

    )

    RTO

    0.1

    .

    nput

    t)(mV

    -0.1

    .

    lizedI

    MINeni(

    -0.3

    -0.2

    Norm

    -0.5

    -0.4

    0 5 10 15 20 25 30 35

    Time (min)

    2.0Representative PartGMIN = 100

    Analog NPBW = 0.1 HzSample Rate = 4 SPS

    1.0

    .

    oise;

    )

    RTO

    0.5

    nput

    t)(mV

    -0.5

    .

    lizedI

    MINeni(

    -1.0

    Norm

    -2.0

    -1.5

    0 5 10 15 20 25 30 35

    Time (min)

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    MCP6N11

    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    2.4 Time Response

    FIGURE 2-43: Small Signal Step

    Response.

    FIGURE 2-44: Large Signal StepResponse.

    FIGURE 2-45: Slew Rate vs. Ambient

    Temperature.

    FIGURE 2-46: Maximum Output Voltage

    Swing vs. Frequency.

    FIGURE 2-47: Common Mode InputOverdrive Recovery Time vs. Normalized Gain.

    FIGURE 2-48: Differential Input Overdrive

    Recovery Time vs. Normalized Gain.

    )

    VDD = 5.5VGDM = GMIN

    V/div RF + RG = 10 k

    e(10

    =

    Voltag MIN

    GMIN = 100

    utput

    0 2 4 6 8 10 12 14 16 18 20

    Time (s)

    5.0

    5.5

    )

    VDD = 5.5VGDM = GMIN

    4.0

    4.5

    V/div RF + RG = 10 k

    3.0

    3.5

    e(10

    2.0

    2.5

    Voltag GMIN = 1 to 10

    GMIN = 100

    1.0

    1.5

    utput

    0.0

    0.5

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0Time (s)

    9

    10

    8)

    6e(V/

    4ewRa GMIN = 1 to 1 0

    GMIN = 100

    DD .VDD = 1.8V

    2

    3Sl

    0

    1

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    10

    ing

    geSw VDD = 5.5V

    tVolta

    -P) VDD = 1.8V

    Outpu(V

    P

    GMIN = 1 to 10GMIN = 100

    imum

    0Max

    1.E+4 1.E+5 1.E+6Frequency (Hz)

    10k 100k 1M

    1000

    es)

    GDMVDM = 1V

    Volta

    tIRC

    (

    VDD = 5.5V

    Mode

    overy;

    VDD = 1.8V

    10mmon

    eRec

    putC

    erdri

    GMIN = 100

    1

    InOGMIN = 1

    GMIN = 10

    1 10 100Normalized Gain; GDM/GMIN

    1000

    ges)

    eVolt

    tIRD

    (

    V = 5.5V100

    lMod

    overy;

    VDD = 1.8V

    .

    erenti

    eRec

    utDiff

    verdri

    GMIN = 100

    1

    InO

    GMIN = 1

    GMIN = 10

    1 10 100

    Normalized Gain; GDM/GMIN

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-49: Output Overdrive Recovery

    Time vs. Normalized Gain.

    FIGURE 2-50: The MCP6N11 Shows No

    Phase Reversal vs. Common Mode InputOverdrive, with VDD = 5.5V.

    FIGURE 2-51: The MCP6N11 Shows No

    Phase Reversal vs. Differential Input Overdrive,

    with VDD = 5.5V.

    100

    1000

    tOverdriveRecovery;

    tOR

    (s

    )

    GMIN = 10

    GDM = 2GMINVREF = 0.75VDD

    GMIN = 1VDD = 1.8V

    VDD = 5.5V

    1

    1 10 100

    Outpu

    Normalized Gain; GDM/GMIN

    GMIN = 100

    6

    ut VDD = 5.5V

    G V = +0.1VVCM

    4,Outp

    .f = 10 kHz

    3Mode

    es(V)

    2

    mmon

    Voltag

    1

    putCo VOUT, GMIN = 1

    VOUT, GMIN = 100

    -1

    In

    0 10 20 30 40 50 60 70 80 90 100

    Time (s)

    4VDD = 5.5V VIP

    2es(V)

    1Volta V

    OUT

    , GMIN

    = 1VOUT, GMIN = 100

    -1utput

    -2

    nput,

    -4

    -3I

    VIM

    0 10 20 30 40 50 60 70 80 90 100

    Time (s)

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    MCP6N11

    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    2.5 Enable/Calibration and POR Responses

    FIGURE 2-52: EN/CAL and Output Voltage

    vs. Time, with VDD = 1.8V.

    FIGURE 2-53: EN/CAL and Output Voltage

    vs. Time, with VDD = 5.5V

    FIGURE 2-54: EN/CALHysteresis vs.

    Ambient Temperature.

    FIGURE 2-55: EN/CAL Turn On Time vs.

    Ambient Temperature.

    FIGURE 2-56: Power Supply On and Off

    and Output Voltage vs. Time.

    FIGURE 2-57: POR Trip Voltages and

    Hysteresis vs. Temperature.

    0.6

    0.8

    1.0

    1.2

    1.4

    1.6

    1.8

    2.0

    ,OutputVoltage(V

    )VDD = 1.8VVL = 0V

    INAturns off

    CalibrationStarts

    INAturns on

    -0.2

    0.0

    0.2

    0.4

    0 10 20 30 40 50 60 70 80 90 100

    EN/CAL

    Time (ms)

    EN/CAL VOUT

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    6.0

    ,OutputVoltage(V)

    VDD = 5.5VVL = 0V

    INAturns off

    CalibrationStarts

    INAturns on

    -0.5

    0.0

    0.5

    1.0

    1.5

    0 10 20 30 40 50 60 70 80 90 100

    EN/CAL

    Time (ms)

    EN/CAL VOUT

    0.55

    0.60

    0.45

    0.50

    s(V)

    VDD = 5.5V

    0.35

    0.40

    teresi

    0.25

    .

    LHy

    0.10

    0.15

    .

    EN/C

    VDD = 1.8V

    0.00

    0.05

    .

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    30

    s)

    25

    ;tO

    N(

    VDD = 5.5V

    20

    Time

    VDD = 1.8V

    urnO

    CALT

    0

    EN

    -50 -25 0 25 50 75 100 125

    Ambient Temperature (C)

    1.6

    1.8

    (V)

    VL = 0V

    1 2

    1.4

    oltag

    1.0

    .

    utput

    On

    0.6

    .

    ply,O

    VDD VOUT

    0.2

    0.4

    erSup

    -0.2

    0.0Pow Calibrating

    0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

    Time (s)

    0.08

    0.10

    0.12

    0.14

    0.16

    0.18

    1.2

    1.3

    1.4

    1.5

    1.6

    1.7

    Hysteresis(V)

    TripVoltages(V)

    VPRH VPRL

    VPRH

    0.00

    0.02

    0.04

    .

    0.8

    0.9

    1.0

    .

    -50 -25 0 25 50 75 100 125

    PO

    POR

    Ambient Temperature (C)

    VPRL

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    Note: Unless otherwise indicated, TA= +25C, VDD= 1.8V to 5.5V, VSS= GND, EN/CAL = VDD, VCM= VDD/2, VDM = 0V,

    VREF = VDD/2, VL = VDD/2, RL= 10 kto VL, CL= 60 pF and GDM= GMIN; see Figure 1-6and Figure 1-7.

    FIGURE 2-58: Quiescent Current in

    Shutdown vs. Power Supply Voltage.

    FIGURE 2-59: Output Leakage Current vs.

    Output Voltage.

    0.0

    nt; EN/CAL = 0V

    -0.5

    Curr

    -1.0Suppl

    A)

    -1.5owerIS

    S

    (

    -2.0ative

    +125C+85C

    -2.5Neg

    +25C-40C

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5

    Power Supply Voltage (V)

    1.E-07

    )EN/CAL = 0VVDD = 5.5V

    100n

    1.E-08

    ent(A

    +125C10n

    1.E-09eC

    ur

    +85C1n

    1.E-10eaka

    100p

    1.E-11utput

    10p

    1.E-12

    O +25C

    1

    0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

    Output Voltage (V)

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    MCP6N11

    3.0 PIN DESCRIPTIONS

    Descriptions of the pins are listed in Table 3-1.

    3.1 Analog Signal InputsThe non-inverting and inverting inputs (VIP, and VIM)

    are high-impedance CMOS inputs with low bias

    currents.

    3.2 Analog Feedback Input

    The analog feedback input (VFG) is the inverting input

    of the second input stage. The external feedback

    components (RFand RG) are connected to this pin. It is

    a high-impedance CMOS input with low bias current.

    3.3 Analog Reference Input

    The analog reference input (VREF) is the non-invertinginput of the second input stage; it shifts VOUT to its

    desired range. The external gain resistor (RG) is

    connected to this pin. It is a high-impedance CMOS

    input with low bias current.

    3.4 Analog Output

    The analog output (VOUT) is a low-impedance voltage

    output. It represents the differential input voltage

    (VDM = VIP VIM), with gain GDM and is shifted by

    VREF. The external feedback resistor (RF) is connected

    to this pin.

    3.5 Power Supply PinsThe positive power supply (VDD) is 1.8V to 5.5V higher

    than the negative power supply (VSS). For normal

    operation, the other pins are between VSSand VDD.

    Typically, these parts are used in a single (positive)

    supply configuration. In this case, VSSis connected to

    ground and VDD is connected to the supply; VDDwill

    need bypass capacitors.

    3.6 Digital Enable and VOSCalibration

    Input

    This input (EN/CAL) is a CMOS, Schmitt-triggered

    input that controls the active, low power and VOScalibration modes of operation. When this pin goes low,

    the part is placed into a low power mode and the output

    is high-Z. When this pin goes high, the amplifiers input

    offset voltage is corrected by the calibration circuitry,

    then the output is re-connected to the VOUTpin, which

    becomes low impedance, and the part resumes normal

    operation.

    3.7 Exposed Thermal Pad (EP)

    There is an internal connection between the Exposed

    Thermal Pad (EP) and the VSS pin; they must be

    connected to the same potential on the Printed Circuit

    Board (PCB).This pad can be connected to a PCB ground plane to

    provide a larger heat sink. This improves the package

    thermal resistance (JA).

    TABLE 3-1: PIN FUNCTION TABLE

    MCP6N11Symbol Description

    SOIC TDFN1 1 VFG Feedback Input

    2 2 VIM Inverting Input

    3 3 VIP Non-inverting Input

    4 4 VSS Negative Power Supply

    5 5 VREF Reference Input

    6 6 VOUT Output

    7 7 VDD Positive Power Supply

    8 8 EN/CAL Enable/VOSCalibrate Digital Input

    9 EP Exposed Thermal Pad (EP); must be connected to VSS

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    NOTES:

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    MCP6N11

    4.0 APPLICATIONS

    The MCP6N11 instrumentation amplifier (INA) is

    manufactured using Microchips state of the art CMOS

    process. It is low cost, low power and high speed,

    making it ideal for battery-powered applications.

    4.1 Basic Performance

    4.1.1 STANDARD CIRCUIT

    Figure 4-1shows the standard circuit configuration for

    these INAs. When the inputs and output are in their

    specified ranges, the output voltage is approximately:

    EQUATION 4-1:

    FIGURE 4-1: Standard Circuit.

    For normal operation, keep:

    VIP, VIM, VREFand VFGbetween VIVLand VIVH

    VIP VIM(i.e., VDM) between VDMLand VDMH VOUTbetween VOLand VOH

    4.1.2 ARCHITECTURE

    Figure 4-2shows the block diagram for these INAs.

    FIGURE 4-2: MCP6N11 Block Diagram.

    The input offset voltage (VOS) is corrected by the

    voltage VTR. Each time a VOSCalibration event occurs,

    VTR is updated to the best value (at that moment).

    These events are triggered by either powering up

    (monitored by the POR) or by toggling the EN/CAL pin

    high. The current out of GM3(I3) is constant and very

    small (assumed to be zero in the following discussion).

    The input signal is applied to GM1. Equation 4-2shows

    the relationships between the input voltages (VIPand

    VIM) and the common mode and differential voltages

    (VCMand VDM).

    EQUATION 4-2:

    The negative feedback loop includes GM2, RM4, RFand

    RG. These blocks set the DC open-loop gain (AOL) and

    the nominal differential gain (GDM):

    EQUATION 4-3:

    AOLis very high, so I4is very small and I1+ I20. Thismakes the differential inputs to GM1and GM2equal in

    magnitude and opposite in polarity. Ideally, this gives:

    EQUATION 4-4:

    For an ideal part, changing VCM, VSSor VDDproduces

    no change in VOUT. VREFshifts VOUTas needed.

    The different GMINoptions change GM1, GM2and the

    internal compensation capacitor. This results in the

    performance trade-offs shown in Table 1.

    VOUT VREF + GDMVDMWhere:

    GDM = 1 + RF / RG

    VOUT

    VIP

    VDD

    VIM

    VREF

    VFGRF

    RG

    U1

    MCP6N11

    RF VFG

    VOUT

    Low Power

    VSSVDD

    EN/CAL

    VOUT

    VOS Calibration

    VREF

    RM4

    GM2 I2VREF

    I4

    GM3

    I3

    VTR

    RG

    VIP

    VIM

    GM1

    I1VIP

    VIM

    POR

    VIP VCM VDM 2+=

    VIM VCM VDM 2=

    VCM VIP VIM+( ) 2=

    VDM VIP VIM=

    AOL GM2RM4=

    GDM 1 RF RG+=

    VFG VRE F( ) VDM=

    VOU T VDMGDM VRE F+=

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    4.1.3 DC ERRORS

    Section 1.5 Explanation of DC Error Specs

    defines some of the DC error specifications. These

    errors are internal to the INA, and can be summarized

    as follows:

    EQUATION 4-5:

    The non-linearity specs (INLCM and INLDM) describe

    errors that are non-linear functions of VCMand VDM,

    respectively. They give the maximum excursion from

    linear response over the entire common mode and

    differential ranges.

    The input bias current and offset current specs (IBand

    IOS), together with a circuits external input resistances,

    give an additional DC error. Figure 4-3 shows the

    resistors that set the DC bias point.

    FIGURE 4-3: DC Bias Resistors.

    The resistors at the main input (RIPand RIM) and its

    input bias currents (IBP

    and IBM

    ) give the following

    changes in the INAs bias voltages:

    EQUATION 4-6:

    The best design results when RIPand RIMare equal

    and small:

    EQUATION 4-7:

    The resistors at the feedback input (RR, RFand RG)

    and its input bias currents (IBR and IBF) give the

    following changes in the INAs bias voltages:

    EQUATION 4-8:

    The best design results when GDMRRand RFare equaland small:

    EQUATION 4-9:

    Where:

    VOU T VRE F GDM1 gE+( ) VDM VED+( )+=

    GDM1 gE+( ) VE VE+( )+

    Where:

    PSRR, CMRRandAOLare in units of V/V

    TAis in units of C

    VE VOS

    VDD VSS

    PSRR---------------------------------

    VCM

    CMRR-----------------

    VRE F

    CMRR-----------------+ + +=

    VOU T

    AOL----------------- TA

    VOS

    TA-------------+ +

    VED INLDMVDM H VDM L( )

    VE INLCMVIV H VIV L( )

    VOUT

    VIP

    VDD

    VIM

    VREF

    RF

    RG

    RIP

    RIM

    RR

    IBP

    IBM VFG

    IBF

    IBR

    U1

    MCP6N11

    Where:

    CMRR is in units of V/V

    VIP IBPRIP IBIOS

    2--------

    RIP= =

    VIM IBMRIM IBIOS

    2--------+

    RIM= =

    VCM

    VIP VIM+

    2---------------------------------=

    IBRIP RIM+

    2-------------------------

    I OS2

    -----------R IP RIM+

    2----------------------------

    +=

    VDM VIP VIM=

    IB R IP RIM+( ) IOS

    2-------- RIP RIM+( )=

    VOU T GDM VDM

    VCM

    CMRR-----------------+

    =

    Where:

    RIP= RIM

    RTOL = tolerance of RIPand RIM

    VOU T GDMVDM

    GDM 2IBRT OL IOS( )RIP

    Where:

    IB2meets the IBspec, but is not equal to IB

    IOS2meets the IOSspec, but is not equal to IOS

    VRE F IBRRR IB2IOS2

    2----------

    RR= =

    VFG VRE F,

    VOU T IB2 RF GDMRR( ) IOS2

    2---------- RF GDMRR+( )+

    due to highAOL

    Where:

    GDMRR= RF

    RTOL = tolerance of RR, RFand RG

    VOU T 2IB2RT OL IOS2+( )( )RF

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    4.1.4 AC PERFORMANCE

    The bandwidth of these amplifiers depends on GDMand GMIN:

    EQUATION 4-10:

    The bandwidth at the maximum output swing is called

    the Full Power Bandwidth (fFPBW). It is limited by the

    Slew Rate (SR) for many amplifiers, but is close to fBWfor these parts:

    EQUATION 4-11:

    CMRR is constant from DC to about 1 kHz.

    4.1.5 NOISE PERFORMANCE

    As shown in Figures 2-41 and 2-42, the 1/f noise

    causes an apparent wander in the DC output voltage.Changing the measurement time or bandwidth has little

    effect on this noise.

    We recommend re-calibrating VOS periodically, to

    reduce 1/f noise wander. For example, VOScould be

    re-calibrated at least once every 15 minutes; more

    often when temperature or VDDchange significantly.

    4.2 Functional Blocks

    4.2.1 RAIL-TO-RAIL INPUTS

    Each input stage uses one PMOS differential pair at the

    input. The output of each differential pair is processed

    using current mode circuitry. The inputs show no

    crossover distortion vs. common mode voltage.

    With this topology, the inputs (VIP and VIM) operate

    normally down to VSS 0.2V and up to VDD + 0.15V at

    room temperature (see Figure 2-11). The input offset

    voltage (VOS) is measured at VCM = VSS 0.2V and

    VDD + 0.15V (at +25C), to ensure proper operation.

    4.2.1.1 Phase Reversal

    The input devices are designed to not exhibit phase

    inversion when the input pins exceed the supply

    voltages. Figures 2-18and 2-50show an input voltage

    exceeding both supplies with no phase inversion.

    The input devices also do not exhibit phase inversion

    when the differential input voltage exceeds its limits;

    see Figures 2-22and 2-51.

    4.2.1.2 Input Voltage Limits

    In order to prevent damage and/or improper operation

    of these amplifiers, the circuit must limit the voltages at

    the input pins (see Section 1.1 Absolute Maximum

    Ratings ). This requirement is independent of the

    current limits discussed later on.

    The ESD protection on the inputs can be depicted as

    shown in Figure 4-4. This structure was chosen to

    protect the input transistors against many (but not all)

    overvoltage conditions, and to minimize input bias

    current (IB).

    FIGURE 4-4: Simplified Analog Input ESDStructures.

    Where:

    fBW= -3 dB bandwidth

    fGBWP= Gain bandwidth product

    fBW

    fGBWP

    GDM---------------

    0.50 MHz( ) GMI N GDM( ),

    0.35 MHz( ) GMI N GDM( ),

    GMIN= 1, , 10

    GMIN= 100

    Where:

    VO = Maximum output voltage swing

    VOH VOL

    fFP BWSR

    VO----------

    fBW , for these parts

    Bond

    Pad

    Bond

    Pad

    Bond

    Pad

    VDD

    VIP

    VSS

    InputStage

    Bond

    PadVIM

    ofINA Input

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    The input ESD diodes clamp the inputs when they try

    to go more than one diode drop below VSS. They also

    clamp any voltages that go too far above VDD; their

    breakdown voltage is high enough to allow normal

    operation, but not low enough to protect against slow

    overvoltage (beyond VDD) events. Very fast ESD

    events (that meet the spec) are limited so that damage

    does not occur.

    In some applications, it may be necessary to prevent

    excessive voltages from reaching the op amp inputs.

    Figure 4-5 shows one approach to protecting these

    inputs. D1and D2may be small signal silicon diodes,

    Schottky diodes for lower clamping voltages or diode-

    connected FETs for low leakage.

    FIGURE 4-5: Protecting the Analog Inputs

    Against High Voltages.

    4.2.1.3 Input Current Limits

    In order to prevent damage and/or improper operation

    of these amplifiers, the circuit must limit the currents

    into the input pins (see Section 1.1 Absolute Maxi-

    mum Ratings ). This requirement is independent of

    the voltage limits previously discussed.

    Figure 4-6 shows one approach to protecting theseinputs. The resistors R1 and R2 limit the possible

    current in or out of the input pins (and into D1and D2).

    The diode currents will dump onto VDD.

    FIGURE 4-6: Protecting the Analog Inputs

    Against High Currents.

    It is also possible to connect the diodes to the left of the

    resistor R1and R2. In this case, the currents through

    the diodes D1and D2need to be limited by some other

    mechanism. The resistors then serve as in-rush current

    limiters; the DC current into the input pins (VIPand VIM)

    should be very small.

    A significant amount of current can flow out of the

    inputs (through the ESD diodes) when the common

    mode voltage (VCM) is below ground (VSS); see

    Figure 2-25.

    4.2.1.4 Input Voltage Ranges

    Figure 4-7 shows possible input voltage values

    (VSS = 0V). Lines with a slope of +1 have constant VDM(e.g., the VDM = 0 line). Lines with a slope of -1 have

    constant VCM(e.g., the VCM = VDD/2 line).

    For normal operation, VIPand VIMmust be kept within

    the region surrounded by the thick blue lines. The

    horizontal and vertical blue lines show the limits on the

    individual inputs. The blue lines with a slope of +1 show

    the limits on VDM; the larger GMINis, the closer they areto the VDM = 0 line.

    The input voltage range specs (VIVLand VIVH) change

    with the supply voltages (VSSand VDD, respectively).

    The differential input range specs (VDML and VDMH)

    change with minimum gain (GMIN). Temperature also

    affects these specs.

    To take full advantage of VDML and VDMH, set VREF(see Figure 1-6 and Figure 1-7) so that the output

    (VOUT) is centered between the supplies (VSS and

    VDD).

    FIGURE 4-7: Input Voltage Ranges.

    VDD

    V1

    D1

    V2

    D2

    U1

    MCP6N11

    min(R1, R2) >VSS min(V1, V2)

    2 mA

    VDD

    V1R1

    D1

    V2R2

    D2

    U1

    MCP6N11

    min(R1, R2) >max(V1, V2) VDD

    2 mA

    VIP

    VIM

    VDM=0

    VIVH

    VIVL

    0

    VIVH

    VIVL

    0

    VDM=VD

    MH

    VCM=

    VDD/2

    VDM=VD

    MH

    VDD

    VDD

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    4.2.2 ENABLE/VOSCALIBRATION

    (EN/CAL)

    These parts have a Normal mode, a Low Power mode

    and a VOSCalibration mode.

    When the EN/CAL pin is high and the internal POR

    (with delay) indicates that power is good, the part

    operates in its Normal mode.When the EN/CAL pin is low, the part operates in its

    Low Power mode. The quiescent current (at VSS) drops

    to -2.5 A (typical), the amplifier output is put into a

    high-impedance state. Signals at the input pins can

    feed through to the output pin.

    When the EN/CAL pin goes high and the internal POR

    (with delay) indicates that power is good, the amplifier

    internally corrects its input offset voltage (VOS) with the

    internal common mode voltage at mid-supply (VDD/2)

    and the output tri-stated (after tOFF). Once VOSCalibra-

    tion is completed, the amplifier is enabled and normal

    operation resumes.

    The EN/CAL pin does not operate normally when leftfloating. Either drive it with a logic output, or tie it high

    so that the part is always on.

    4.2.3 POR WITH DELAY

    The internal POR makes sure that the input offset

    voltage (VOS) is calibrated whenever the supply

    voltage goes from low voltage (< VPRL) to high voltage

    (> VPRH). This prevents corruption of the VOStrim reg-

    isters after a low-power event.

    After the POR goes high, the internal circuitry adds a

    fixed delay (tPLH), before telling the VOS Calibration

    circuitry (see Figure 4-2) to start. If the EN/CAL pin is

    toggled during this time, the fixed delay is restarted(takes an additional time tPLH).

    4.2.4 PARITY DETECTOR

    A parity error detector monitors the memory contents

    for any corruption. In the rare event that a parity error is

    detected (e.g., corruption from an alpha particle), a

    POR event is automatically triggered. This will cause

    the input offset voltage to be re-corrected, and the op

    amp will not return to normal operation for a period of

    time (the POR turn on time, tPLH).

    4.2.5 RAIL-TO-RAIL OUTPUT

    The Minimum Output Voltage (VOL

    ) and Maximum

    Output Voltage (VOH) specs describe the widest output

    swing that can be achieved under the specified load

    conditions.

    The output can also be limited when VIPor VIMexceeds

    VIVLor VIVH, or when VDMexceeds VDMLor VDMH.

    4.3 Applications Tips

    4.3.1 MINIMUM STABLE GAIN

    There are different options for different Minimum Stable

    Gains (1, 2, 5, 10 and 100 V/V; see Table 1-1). The

    differential gain (GDM) needs to be greater than or

    equal to GMINin order to maintain stability.

    Picking a part with higher GMINhas the advantages of

    lower Input Noise Voltage Density (eni), lower Input

    Offset Voltage (VOS) and increased Gain Bandwidth

    Product (GBWP); see Table 1. The Differential Input

    Voltage Range (VDMR) is lower for higher GMIN, but the

    output voltage range would limit VDMRanyway, when

    GDM 2.

    4.3.2 CAPACITIVE LOADS

    Driving large capacitive loads can cause stability

    problems for amplifiers. As the load capacitance

    increases, the feedback loops phase margin

    decreases, and the closed-loop bandwidth is reduced.

    This produces gain peaking in the frequency response,with overshoot and ringing in the step response. Lower

    gains (GDM) exhibit greater sensitivity to capacitive

    loads.

    When driving large capacitive loads with these

    instrumentation amps (e.g., > 100 pF), a small series

    resistor at the output (RISOin Figure 4-8) improves the

    feedback loops phase margin (stability) by making the

    output load resistive at higher frequencies. The

    bandwidth will be generally lower than the bandwidth

    with no capacitive load.

    FIGURE 4-8: Output Resistor, RISO

    stabilizes large capacitive loads.

    Figure 4-9 gives recommended RISO values for

    different capacitive loads and gains. The x-axis is the

    normalized load capacitance (CL GMIN/GDM), where

    GDMis the circuits differential gain (1 + RF / RG) and

    GMINis the minimum stable gain.

    RISOVOUT

    CL

    V1

    VDD

    V2

    VREF

    VFGRF

    RG

    U1

    MCP6N11

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    FIGURE 4-9: Recommended RISOValues

    for Capacitive Loads.

    After selecting RISOfor your circuit, double check the

    resulting frequency response peaking and step

    response overshoot on the bench. Modify R ISOs value

    until the response is reasonable.

    4.3.3 GAIN RESISTORS

    Figure 4-10shows a simple gain circuit with the INAs

    input capacitances at the feedback inputs (VREF and

    VFG). These capacitances interact with RGand RFto

    modify the gain at high frequencies. The equivalent

    capacitance acting in parallel to RGis CG = CDM + CCMplus any board capacitance in parallel to RG. CGwill

    cause an increase in GDMat high frequencies, which

    reduces the phase margin of the feedback loop (i.e.,

    reduce the feedback loop's stability).

    FIGURE 4-10: Simple Gain Circuit with

    Parasitic Capacitances.

    In this data sheet, RF + RG = 10 kfor most gains (0for GDM = 1); see Table 1-6. This choice gives good

    Phase Margin. In general, RF (Figure 4-10) needs to

    meet the following limits to maintain stability:

    EQUATION 4-12:

    4.3.4 SUPPLY BYPASS

    With these INAs, the power supply pin (VDDfor single

    supply) should have a local bypass capacitor (i.e.,

    0.01 F to 0.1 F) within 2 mm for good high frequency

    performance. Surface mount, multilayer ceramic

    capacitors, or their equivalent, should be used.

    These INAs require a bulk capacitor (i.e., 1.0 F or

    larger) within 100 mm, to provide large, slow currents.

    This bulk capacitor can be shared with other nearby

    analog parts as long as crosstalk through the supplies

    does not prove to be a problem.

    1.E+03

    1.E+04

    m

    mendedR

    ISO

    ()

    10k

    1k

    1.E+02

    1.E-10 1.E-09 1.E-08 1.E-07 1.E-06

    Rec

    Normalized Load Capacitance;CL GMIN/GDM(F)

    100

    100p 1n 10n 100n 1

    GMIN = 1 to 10GMIN = 100

    VOUT

    V1

    VDD

    V2

    VREF

    VFGRF

    RGCDMCCM

    CCM

    U1

    MCP6N11

    Where:

    0.25

    GDM GMIN

    fGBWP= Gain Bandwidth Product

    CG = CDM+ CCM+ (PCB stray capacitance)

    RF 0=For GDM= 1:

    RF

    GDM2

    2fGBWPCG------------------------------ 1:

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    4.4 Typical Applications

    4.4.1 HIGH INPUT IMPEDANCE

    DIFFERENCE AMPLIFIER

    Figure 4-11shows the MCP6N11 used as a difference

    amplifier. The inputs are high impedance and give good

    CMRR performance.

    FIGURE 4-11: Difference Amplifier.

    4.4.2 DIFFERENCE AMPLIFIER FOR

    VERY LARGE COMMON MODE

    SIGNALS

    Figure 4-12 shows the MCP6N11 INA used as a

    difference amplifier for signals with a very large

    common mode component. The input resistor dividers

    (R1and R2) ensure that the voltages at the INAs inputs

    are within their range of normal operation. The

    capacitors C1, with the parasitic capacitances C2(the

    resistors parasitic capacitance plus the INAs input

    common mode capacitance, CCM), set the same

    division ratio, so that high-frequency signals (e.g., a

    step in voltage) have the same gain. Select the INA

    gain to compensate for R1and R2s attenuation. SelectR1and R2s tolerances for good CMRR.

    FIGURE 4-12: Difference Amplifier with

    Very Large Common Mode Component.

    4.4.3 HIGH SIDE CURRENT DETECTOR

    Figure 4-13shows the MCP6N11 INA used as to detect

    and amplify the high side current in a battery powered

    design. The INA gain is set at 21 V/V, so VOUTchanges

    210 mV for every 1 mA of IDDcurrent. The best GMINoption to pick would be a gain of 10 (MCP6N11-010).

    FIGURE 4-13: High Side Current Detector.

    4.4.4 WHEATSTONE BRIDGE

    Figure 4-14 shows the MCP6N11 single

    instrumentation amp used to condition the signal from

    a Wheatstone bridge (e.g., strain gage). The overall

    INA gain is set at 201 V/V. The best GMINoption to pick,

    for this gain, is 100 V/V (MCP6N11-100).

    FIGURE 4-14: Wheatstone BridgeAmplifier.

    VOUT

    VIP

    VDD

    VIM

    VREF

    VFGRF

    RG

    U1

    MCP6N11

    VOUT

    VDD

    VREF

    VFGRF

    RG

    R2R1

    V2

    C1 C2

    R2R1V1

    C1 C2

    U1

    MCP6N11

    IDD = (VBAT VDD)(10)

    =(VOUT VREF)

    (10) (21.0 V/V)

    10VDD

    IDD

    VBAT+1.8V

    to+5.5V

    VOUT

    VREF

    VFG

    RF

    RG

    200 k

    10 k

    U1

    MCP6N11

    VOUT

    VREF

    VFG

    RF

    RG

    200 k

    1 k

    VDD

    RW1RW2

    RW2RW1U1

    MCP6N11

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    MCP6N11

    5.0 DESIGN AIDS

    Microchip provides the basic design aids needed for

    the MCP6N11 instrumentation amplifiers.

    5.1 Microchip Advanced Part Selector

    (MAPS)

    MAPS is a software tool that helps efficiently identify

    Microchip devices that fit a particular design

    requirement. Available at no cost from the Microchip

    website at www.microchip.com/maps, the MAPS is an

    overall selection tool for Microchips product portfolio

    that includes Analog, Memory, MCUs and DSCs. Using

    this tool, a customer can define a filter to sort features

    for a parametric search of devices and export

    side-by-side technical comparison reports. Helpful links

    are also provided for Data sheets, Purchase and

    Sampling of Microchip parts.

    5.2 Analog Demonstration Board

    Microchip offers a broad spectrum of Analog

    Demonstration and Evaluation Boards that are

    designed to help customers achieve faster time

    to market. For a complete listing of these boards

    and their corresponding users guides and technical

    information, visit the Microchip web site at

    www.microchip.com/analog tools.

    5.3 Application Notes

    The following Microchip Application Notes are

    available on the Microchip web site at www.microchip.

    com/appnotesand are recommended as supplemental

    reference resources. AN884:Driving Capacitive Loads With Op

    Amps, DS00884

    AN990:Analog Sensor Conditioning Circuits

    An Overview, DS00990

    AN1228:Op Amp Precision Design: Random

    Noise, DS01228

    Some of these application notes, and others, are listed

    in the design guide:

    Signal Chain Design Guide, DS21825

    http://www.microchip.com/mapshttp://www.microchip.com/mapshttp://www.microchip.com/mapshttp://www.microchip.com/mapshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.microchip.%20com/appnoteshttp://www.microchip.%20com/appnoteshttp://www.microchip.%20com/appnoteshttp://www.microchip.%20com/appnoteshttp://www.micro%20chip.com/analog%20toolshttp://www.micro%20chip.com/analog%20toolshttp://www.microchip.com/mapshttp://www.microchip.com/maps
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    MCP6N11

    6.0 PACKAGING INFORMATION

    6.1 Package Marking Information

    Legend: XX...X Customer-specific information

    Y Year code (last digit of calendar year)

    YY Year code (last 2 digits of calendar year)

    WW Week code (week of January 1 is week 01)

    NNN Alphanumeric traceability code

    Pb-free JEDEC designator for Matte Tin (Sn)

    * This package is Pb-free. The Pb-free JEDEC designator ( )can be found on the outer packaging for this package.

    Note: In the event the full Microchip part number cannot be marked on one line, it will

    be carried over to the next line, thus limiting the number of available

    characters for customer-specific information.

    3e

    3e

    8-Lead SOIC (150 mil) (MCP6N11)

    8-Lead TDFN (23) (MCP6N11) Example

    Device Code

    MCP6N11-001 AAQ

    MCP6N11-002 AAR

    MCP6N11-005 AAS

    MCP6N11-010 AAT

    MCP6N11-100 AAU

    Note: Applies to 8-Lead 2x3 TDFN

    Note: The example is for a

    MCP6N11-001 part.

    NNN

    6N11001E

    SN^^ 1121

    256

    3e

    AAQ

    121

    25

    Example

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    Note: For the most current package drawings, please see the Microchip Packaging Specification located at

    http://www.microchip.com/packaging

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    MCP6N11

    Note: For the most current package drawings, please see the Microchip Packaging Specification located at

    http://www.microchip.com/packaging

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    MCP6N11

    Note: For the most current package drawings, please see the Microchip Packaging Specification located at

    http://www.microchip.com/packaging

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    Note: For the most current package drawings, please see the Microchip Packaging Specification located at

    http://www.microchip.com/packaging

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    MCP6N11

    APPENDIX A: REVISION HISTORY

    Revision A (October 2011)

    Original Release of this Document.

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    MCP6N11

    PRODUCT IDENTIFICATION SYSTEM

    To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

    Device: MCP6N11 Single Instrumentation Amplifier MCP6N11T Single Instrumentation Amplifier

    (Tape and Reel)

    Gain Option: 001 = Minimum gain of 1 V/V002 = Minimum gain of 2 V/V005 = Minimum gain of 5 V/V010 = Minimum gain of 10 V/V100 = Minimum gain of 100 V/V

    Temperature Range: E = -40C to +125C

    Package: MNY = 23 TDFN, 8-lead *SN = Plastic SOIC (150mil Body), 8-lead

    * Y = nickel palladium gold manufacturing designator. Onlyavailable on the TDFN package.

    Examples:

    a) MCP6N11T-001E/MNY: Tape and Reel,Minimum gain = 1,Extended temperature,

    8LD 23 TDFN.

    b) MCP6N11-002E/SN: Minimum gain = 2,Extended temperature,8LD SOIC.

    PART NO. X /XX

    PackageGainOption

    Device

    X

    TemperatureRange

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    Information contained in this publication regarding device

    applications and the like is provided only for your convenience

    and may be superseded by updates. It is your responsibility to

    ensure that your application meets with your specifications.

    MICROCHIP MAKES NO REPRESENTATIONS OR

    WARRANTIES OF ANY KIND WHETHER EXPRESS OR

    IMPLIED, WRITTEN OR ORAL, STATUTORY OR

    OTHERWISE, RELATED TO THE INFORMATION,

    INCLUDING BUT NOT LIMITED TO ITS CONDITION,

    QUALITY, PERFORMANCE, MERCHANTABILITY OR

    FITNESS FOR PURPOSE. Microchip disclaims all liability

    arising from this information and its use. Use of Microchip

    devices in life support and/or safety applications is entirely at

    the buyers risk, and the buyer agrees to defend, indemnify and

    hold harmless Microchip from any and all damages, claims,

    suits, or expenses resulting from such use. No licenses are

    conveyed, implicitly or otherwise, under any Microchip

    intellectual property rights.

    Trademarks

    The Microchip name and logo, the Microchip logo, dsPIC,

    KEELOQ, KEELOQlogo, MPLAB, PIC, PICmicro, PICSTART,

    PIC32logo, rfPIC and UNI/O are registered trademarks of

    Microchip Technology Incorporated in the U.S.A. and other

    countries.

    FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,

    MXDEV, MXLAB, SEEVAL and The Embedded Control

    Solutions Company are registered trademarks of Microchip

    Technology Incorporated in the U.S.A.

    Analog-for-the-Digital Age, Application Maestro, chipKIT,

    chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,

    dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,

    Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,

    MPLINK, mTouch, Omniscient Code Generation, PICC,

    PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,

    rfLAB, Select Mode, Total Endurance, TSHARC,

    UniWinDriver, WiperLock and ZENA are trademarks of

    Microchip Technology Incorporated in the U.S.A. and other

    countries.

    SQTP is a service mark of Microchip Technology Incorporated

    in the U.S.A.

    All other trademarks mentioned herein are property of their

    respective companies.

    2011, Microchip Technology Incorporated, Pr inted in the

    U.S.A., All Rights Reserved.

    Printed on recycled paper.

    ISBN: 978-1-61341-685-3

    Note the following details of the code protection feature on Microchip devices:

    Microchip products meet the specification contained in their particular Microchip Data Sheet.

    Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

    intended manner and under normal conditions.

    There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

    knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchips DataSheets. Most likely, the person doing so is engaged in theft of intellectual property.

    Microchip is willing to work with the customer who is concerned about the integrity of their code.

    Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

    mean that we are guaranteeing the product as unbreakable.

    Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

    products. Attempts to break Microchips code protect ion feature may be a violation of the Digital Millennium Copyright Act. If such acts

    allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

    Microchip received ISO/TS-16949:2009 certification for its worldwideheadquarters, design and wafer fabrication facilities in Chandler andTempe, Arizona; Gresham, Oregon and design centers in Californiaand India. The Companys quality system processes and proceduresare for its PICMCUs and dsPICDSCs, KEELOQcode hoppingdevices, Serial EEPROMs, microperipherals, nonvolatile mem