mic920 micrel, inc. mic920ww1.microchip.com/downloads/en/devicedoc/mic920.pdfib input bias current...
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March 2006 1 MIC920
MIC920 Micrel, Inc.
MIC92080MHz Low-Power SC-70 Op Amp
General DescriptionThe MIC920 is a high-speed operational amplifier with a gain-bandwidth product of 80MHz. The part is unity gain stable. It has a very low 550µA supply current, and features the SC-70 package.Supply voltage range is from ±2.5V to ±9V, allowing the MIC920 to be used in low-voltage circuits or applications requiring large dynamic range.The MIC920 is stable driving any capacitative load and achieves excellent PSRR and CMRR, making it much easier to use than most conventional high-speed devices. Low supply voltage, low power consumption, and small packing make the MIC920 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
Features• 80MHz gain bandwidth product• 115MHz –3dB bandwidth• 550µA supply current• SC-70 or SOT-23-5 packages• 3000V/µs slew rate• Drives any capacitive load• Unity gain stable
Applications• Video• Imaging• Ultrasound• Portable equipment• Line drivers
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Pin ConfigurationIN+V–
OUT
IN–13
4 5
2
V+
A37
PartIdentification
SOT-23-5 or SC-70
Pin Description Pin Number Pin Name Pin Function 1 IN+ Noninverting Input 2 V– Negative Supply (Input) 3 IN– Inverting Input
4 OUT Output: Amplifier Output 5 V+ Positive Supply (Input)
Functional PinoutIN+V–
OUT
IN–13
4 5
2
V+
SOT-23-5 or SC-70
Ordering InformationPart Number
Ambient Temperature PackageStandard Marking Pb-Free MarkingMIC920BM5 A37 –40ºC to +85ºC SOT-23-5*MIC920BC5 A37 MIC920YC5 A37 –40ºC to +85ºC SC-70-5
* Contact factory for availability of SOT-23-5 package.Note: Underbar marking may not be to scale.
MIC920 Micrel, Inc.
MIC920 2 March 2006
Absolute Maximum Ratings (Note 1)Supply Voltage (VV+ – VV–) ........................................... 20VDifferentail Input Voltage (VIN+ – VIN–) ........... 4V, Note 3Input Common-Mode Range (VIN+, VIN–) ............VV+ to VV–Lead Temperature (soldering, 5 sec.) ........................ 260°CStorage Temperature (TS) ......................................... 150°CESD Rating, Note 4 ................................................... 1.5kV
Operating Ratings (Note 2)Supply Voltage (VS) .........................................±2.5V to ±9VJunction Temperature (TJ) .......................... –40°C to +85°CPackage Thermal Resistance ..............................................
SOT-23-5 ........................................................... 260°C/W SC-70-5 ............................................................. 450°C/W
Electrical Characteristics (±5V)V+ = +5V, V– = –5V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.Symbol Parameter Condition Min Typ Max UnitsVOS Input Offset Voltage 0.43 5 mVVOS VOS Temperature Coefficient 1 µV/°CIB Input Bias Current 0.26 0.6 µAIOS Input Offset Current 0.04 0.3 µAVCM Input Common-Mode Range CMRR > 72dB –3.25 +3.25 VCMRR Common-Mode Rejection Ratio –2.5V < VCM < +2.5V 75 85 dBPSRR Power Supply Rejection Ratio ±3.5V < VS < ±9V 95 104 dBAVOL Large-Signal Voltage Gain RL = 2k, VOUT = ±2V 65 82 dB RL = 100Ω, VOUT = ±1V 85 dBVOUT Maximum Output Voltage Swing positive, RL = 2kΩ +3.0 3.6 V negative, RL = 2kΩ –3.6 –3.0 V positive, RL = 200Ω +1.5 3.0 V negative, RL = 200Ω, Note 5 –2.5 –1.0 VGBW Unity Gain-Bandwidth Product CL = 1.7pF 67 MHzPM Phase Margin 32 °BW –3dB Bandwidth Av = 1, RL = 1kΩ, CL = 1.7pF 100 MHzSR Slew Rate C=1.7pF, Gain=1, VOUT=5V, peak to peak, 1350 V/µs positive SR = 1190V/µsISC Short-Circuit Output Current source 45 63 mA sink 20 45 mAIS Supply Current No Load 0.55 0.80 mA
Input Voltage Noise f = 10kHz 11 V/√Hz
Input Current Noise f = 10kHz 0.7 A/√Hz
Electrical CharacteristicsV+ = +9V, V– = –9V, VCM = 0V, RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless notedSymbol Parameter Condition Min Typ Max UnitsVOS Input Offset Voltage 0.3 5 mVVOS Input Offset Voltage 1 µV/°C Temperature CoefficientIB Input Bias Current 0.23 0.60 µAIOS Input Offset Current 0.04 0.3 µAVCM Input Common-Mode Range CMRR > 75dB –7.25 +7.25 VCMRR Common-Mode Rejection Ratio –6.5V < VCM < +6.5V 60 91 dBPSRR Power Supply Rejection Ratio ±3.5V < VS < ±9V 95 104 dB
March 2006 3 MIC920
MIC920 Micrel, Inc.
Symbol Parameter Condition Min Typ Max UnitsAVOL Large-Signal Voltage Gain RL = 2k, VOUT = ±2V 75 84 dB RL = 100Ω, VOUT = ±1V 93 dBVOUT Maximum Output Voltage Swing positive, RL = 2kΩ 6.5 7.5 V negative, RL = 2kΩ –7.5 –6.2 VGBW Unity Gain-Bandwidth Product CL = 1.7pF 80 MHzPM Phase Margin 30 °BW –3dB Bandwidth AV = 1, RL = 1kΩ, CL = 1.7pF 115 MHzSR Slew Rate C=1.7pF, Gain=1, VOUT=5V, peak to peak, 3000 V/µs negative SR = 2500V/µsISC Short-Circuit Output Current source 50 65 mA sink 30 50 mAIS Supply Current No Load 0.55 0.8 mA
Input Voltage Noise f = 10kHz 10 V/√Hz
Input Current Noise f = 10kHz 0.8 A/√Hz
Note 1. Exceeding the absolute maximum rating may damage the device.Note 2. The device is not guaranteed to function outside its operating rating.Note 3. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is
likely to change).Note 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.Note 5. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in “Typical Characteristics.”
MIC920 Micrel, Inc.
MIC920 4 March 2006
Test Circuits
2k10k
10k10k
0.1µF
0.1µF
0.1µF
10µF
50Ω
50
50Ω
0.1µF
10µFAll resistors:1% metal film
Output
Input
Input
V+
V–
MIC920 4
53
12
BNC
BNC
BNC
PSRR vs. Frequency
R2 4k
S2S1
0.1µF
10µF
0.1F
10µF10pF
10pF
V+
V–
MIC920 4
53
12
BNC
R4 27k
R3 27kR1
20Ω
R520Ω
100pF
ToDynamicAnalyzer
Noise Measurement
0.1µF
10µF
0.1µF
10µF
V+
V–
MIC920 4
53
12
BNCR7c 2k
R7b 200ΩR7a 100Ω
Input
R6
5k
R2
5k
R3200k
R4250Ω
R55k
Output
R1 5kBNC
All resistors 1%
V V R2R1
R2 R R4OUT ERROR= + + + +
1 5R7
CMRR vs. Frequency
V+
VIN
V–
MIC920 4
53
12
300Ω
50Ω
VOUTFET Probe
1k CL
0.1µµF
10µF
0.1µF
10µF
Closed Loop Frequency Response Measurement
March 2006 5 MIC920
MIC920 Micrel, Inc.
Typical Characteristics
0.9
0.95
1
1.05
1.1
1.15
1.2
1.25
-40 -20 0 20 40 60 80 100
)Vm(
EGATL
OVTE SFF
O
TEMPERATURE (°C)
Offset Voltagevs. Temperature
V± = ±2.5V
V± = ±5V
V± = ±9V
0.30
0.35
0.40
0.45
0.50
0.55
0.60
-40 -20 0 20 40 60 80 100
)Am(
TNE
RR
UC
YL PPU S
TEMPERATURE (°C)
Supply Currentvs. Temperature
V± = ±2.5V
V± = ±9VV± = ±5V
0.400.420.440.460.480.500.520.540.560.580.600.62
2.5 3.8 5.1 6.4 7.7 9
)Am(
TNE
RR
UC
YL PPU S
SUPPLY VOLTAGE (V)
Supply Currentvs. Supply Voltage
–40°C
+85°C
+25°C
00.20.40.60.8
11.21.41.61.8
22.2
-900 -540 -180 180 540 900
)Vm(
EGATL
OVTES FF
O
COMMON-MODE VOLTAGE (V)
Offset Voltage vs.Common-Mode Voltage
–40°C
+85°C
+25°C
V± = ±2.5V
00.20.40.60.8
11.21.41.61.8
22.2
04.3-27.2-4 0.2-6 3.1-86.0-0 86. 063. 140.227.204. 3
)Vm(
EGATL
O VTESFF
O
COMMON-MODE VOLTAGE (V)
Offset Voltage vs.Common-Mode Voltage
–40°C
+85°C
+25°C
V± = ±5V
00.20.40.60.8
11.21.41.61.8
22.2
04.7-29.5-4 4.4-6 9.2-84.1-0 84.169.244.429.504.7
)Vm(
EGATL
OVTESFF
O
COMMON-MODE VOLTAGE (V)
Offset Voltage vs.Common-Mode Voltage
–40°C
+85°C
+25°C
V± = ±9V
404448525660646872768084
2.0 3.4 4.8 6.2 7.6 9.0
)Am(
TNE
RR
UC
TIU
CRI
C-TR
OHS
SUPPLY VOLTAGE (V)
Short-Circuit Current vs.Supply Voltage (Sourcing)
–40°C
85°C
25°C
504744413835322926232017
2.0 3.4 4.8 6.2 7.6 9.0
)Am(
TNE
RR
UC
TIU
CRI
C-TR
OHS
SUPPLY VOLTAGE (V)
Short-Circuit Current vs.Supply Voltage (Sinking)
–40°C
85°C25°C
0123456789
1011
0 8- 61-42-23-04-84-65-46-27-08-
) V(E
GAT LO V
TU
OTU
O
OUTPUT CURRENT (mA)
Output Voltage vs.Output Current (Sourcing)
–40°C
85°C
25°C
V± = ±9V
-10-9-8-7-6-5-4-3-2-101
05 54 04 53 03 5 2 02 5 1 01 5 0
)V(E
GATLOV
TU
OTU
O
OUTPUT CURRENT (mA)
Output Voltage vs.Output Current (Sinking)
–40°C
85°C
25°C V± = ±9V
-5.0-4.5-4.0-3.5-3.0-2.5-2.0-1.5-1.0-0.5
00.5
0.545.040.6 35.1 30.7 25.2 20.815.3 10.95.40
)V(E
GAT LOV
TUPTUO
OUTPUT CURRENT (mA)
Output Voltage vs.Output Current (Sinking)
25°C
85°C
–40°C
V± = ±5V
00.51.01.52.02.53.03.54.04.55.05.5
0 8- 61-42-23-04-84-65-46 -27 -08-
)V(E
GATLOV
TU PT
UO
OUTPUT CURRENT (mA)
Output Voltage vs.Output Current (Sourcing)
–40°C
85°C
25°C
V± = ±5V
MIC920 Micrel, Inc.
MIC920 6 March 2006
-50-40-30-20-10
01020304050
1E+6 1E+7 1E+82E+8
)Bd(NIA
GP
OOL-
DESO L
C
FREQUENCY (Hz)
Closed-Loop Gainvs. Frequency
V± = ±9VAv = 1
1M 10M 100M
1000pF800pF
600pF
100pF
200pF
400pF
1.7pF
-50-40-30-20-10
01020304050
1E+6 10E+6 100E+6200E+6
)Bd(NIA
GP
OOL-
DESOL
C
FREQUENCY (Hz)
Closed-Loop Gainvs. Frequency
V± = ±5VAv = 1
1M 100M10M
1000pF800pF
600pF
400pF 200pF
0100pF
50
55
60
65
70
75
80
85
)zH
M(HT
DIW
DN AB
NI AG
Gain Bandwidth and PhaseMargin vs. Supply Voltage
25
27
29
31
33
35
37
0 1 2 3 4 5 6 7 8 9 10
(NI
GRA
MESA
HP° )
SUPPLY VOLTAGE (±V)
Phase Margin
Gain Bandwidth0
10
20
30
40
50
60
70
)zH
M(HT
DIW
DN AB
NI AG
Gain Bandwidth and PhaseMargin vs. Load
20
25
30
35
40
45
50
0 200 400 600 800 1000(
NIG
RAM
ESAHP
° )CAPACITIVE LOAD (pF)
Phase Margin
GainBandwidth
V± = ±5V
0102030405060708090
)zH
M(HT
DIW
DNA B
NIAG
Gain Bandwidth and PhaseMargin vs. Load
20
25
30
35
40
45
50
55
0 200 400 600 800 1000
(NI
GRA
MESA
HP° )
CAPACITIVE LOAD (pF)
Phase Margin
GainBandwidth
V± = ±9V
-25-20-15-10-505
10152025
1E+6 10E+6 100E+6200E+6
)Bd(NIA
G
FREQUENCY (Hz)
Closed-Loop FrequencyResponse
Av =–1R+ = RI = 475Ω
±9.0V
±2.5V
±5.0V
100M1M 10M
-50-40-30-20-10
01020304050
1x106 10x106 100x106200x106
)Bd(NIA
GP
OOL-
NEPO
FREQUENCY (Hz)
Open-Loop Gainvs. Frequency
V± = ±5V
100M10M1M
1.7pF50pF
121pF
471pF200pF
1000pF
-50-40-30-20-10
01020304050
1x106 10x106 100x106200x106
)Bd(NIA
GP
OO L-
NEPO
FREQUENCY (Hz)
Open-Loop Gainvs. Frequency
V± = ±9V
100M10M1M
1.7pF50pF
121pF
471pF200pF
1000pF
-100-80-60-40-20
020406080
100
)Bd(
HT
DIW
DN
AB
NIA
G
Open-Loop FrequencyResponse
-225-180-135-90-4504590135180225
(NI
GR
AM
ES
AH
P°)
CAPACITIVE LOAD (pF)
Phase
Gain
V± = ±5V
100Ω
100Ω
No Load
100k 1M 10M 100M
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
-40 -20 0 20 40 60 80 100
(T
NER
RU
CSAIB
µ)A
TEMPERATURE (°C)
Bias Current vs.Temperature
±9V
±5V
-25-20-15-10-505
10152025
1E+6 10E+6 100E+6200E+6
)Bd(NIA
G
FREQUENCY (Hz)
Closed-Loop FrequencyResponse
Av = 2RF = RI = 475Ω
±9.0V
±2.5V
±5.0V
100M1M 10M
-100-80-60-40-20
020406080
100
)Bd(HT
DIW
DNAB
NIAG
Open-Loop FrequencyResponse
-225-180-135-90-4504590135180225
(NI
GRA
MESA
HP° )
CAPACITIVE LOAD (pF)
Phase
Gain
V± = ±9V
100Ω
100Ω
No Load
100k 1M 10M 100M
March 2006 7 MIC920
MIC920 Micrel, Inc.
0
500
1000
1500
2000
2500
3000
3500
0 200 400 600 800 1000
/V(ETA
RWELS
µ)s
LOAD CAPACITANCE (pF)
Positive Slew RateV± = ±9V
0
500
1000
1500
2000
2500
3000
0 200 400 600 800 1000
/V(ETA
RWELS
µ) s
LOAD CAPACITANCE (pF)
Negative Slew RateV± = ±9V
0
200
400
600
800
1000
1200
1400
0 200 400 600 800 1000
/V(ETA
RWELS
µ) s
LOAD CAPACITANCE (pF)
Positive Slew RateV± = ±5V
0
200
400
600
800
1000
1200
0 200 400 600 800 1000
/V(ETA
RWELS
µ) s
LOAD CAPACITANCE (pF)
Negative Slew RateV± = ±5V
0102030405060708090
100
100x100 1x103 10x103 100x103 1x106 10x106
)Bd(R
RM
C
FREQUENCY (Hz)
Common-ModeRejection Ratio
V± = ±9V
100 1k 10k 100k 1M 10M0
102030405060708090
100
100x100 1x103 10x103 100x103 1x106 10x106
)Bd(R
RM
C
FREQUENCY (Hz)
Common-ModeRejection Ratio
V± = ±5V
100 1k 10k 100k 1M 10M
0
20
40
60
80
100
120
)Bd(R
RSP
FREQUENCY (kHz)
Negative PSRRvs. Frequency
V± = ±5V
0.1 1 10 100 1k 10k
0
20
40
60
80
100
120
)Bd(R
RSP
FREQUENCY (kHz)
Negative PSRRvs. Frequency
V± = ±9V
0.1 1 10 100 1k 10k
0
20
40
60
80
100
120
)Bd(R
RSP
FREQUENCY (kHz)
Positive PSRRvs. Frequency
V± = ±5V
0.1 1 10 100 1k 10k0
20
40
60
80
100
120
)Bd(R
RSP
FREQUENCY (kHz)
Positive PSRRvs. Frequency
V± = ±9V
0.1 1 10 100 1k 10k
0
10
20
30
40
50
60
70
10 100 1000 10000 100000
zH/Vn(
EGATL
OVESI
ON
2/ 1)
FREQUENCY (Hz)
Voltage Noise Densityvs. Frequency
0
0.5
1.0
1.5
2.0
2.5
10 100 1000 10000 100000
zH/Ap(
TNE
RR
UC
ESIO
N2/1)
FREQUENCY (Hz)
Current Noise Densityvs. Frequency
MIC920 Micrel, Inc.
MIC920 8 March 2006
Functional Characteristics
TIME (100ns/div)
VCC = ±9.0VCL = 1.7µFAv = 1.0V/V
Small Signal Response
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
TIME (100ns/div)
VCC = ±5.0VCL = 1.7µFAv = 1.0V/V
Small Signal Response
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
TIME (100ns/div)
Small Signal Response
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
VCC = ±9.0VCL = 100pFAv = +1
TIME (100ns/div)
Small Signal Response
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
VCC = ±5.0VCL = 100pFAv = +1V/V
Small Signal Response
TIME (100ns/div)
VCC = ±9.0VCL = 1000pFAv = +1V/V
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
Small Signal Response
TIME (100ns/div)
INP
UT
(50m
V/d
iv)
OU
TPU
T(5
0mV
/div
)
VCC = ±5.0VCL = 1000pFAv = +1V/V
March 2006 9 MIC920
MIC920 Micrel, Inc.
Large Signal Response
TIME (10ns/div)
V = ±5VCL = 1.7pF
Av = 1Positive SR = 1350V/µsecNegative SR = 1190V/sec
OU
TPU
T(2
V/d
iv)
Large Signal Response
TIME (10ns/div)
V = ±9VCL = 1.7pF
Av = 1Positive SR = 3000V/µsec
Negative SR = 2500V/µsec
OU
TPU
T(2
V/d
iv)
Large Signal Reponse
TIME (50ns/div)
V = ±5VCL = 100pF
Av = 1Positive SR = 373V/µsecNegative SR = 290V/sec
OU
TPU
T(2
V/d
iv)
Large Signal Response
TIME (50ns/div)
V = ±9VCL = 100pF
Av = 1Positive SR = 672V/µsecNegative SR = 424V/sec
OU
TPU
T(2
V/d
iv)
Large Signal Response
TIME (100ns/div)
V = ±5VCL = 1000pF
Av = 1Positive SR = 75V/µsecNegative SR = 41V/sec
Out
put
(2V
/div
)
Large Signal Response
TIME (100ns/div)
V = ±9VCL = 1000pF
Av = 1Positive SR = 97V/µsecNegative SR = 60V/sec
OU
TPU
T(2
V/d
iv)
MIC920 Micrel, Inc.
MIC920 10 March 2006
Applications InformationThe MIC920 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable, capable of driving high capacitance loads.Driving High CapacitanceThe MIC920 is stable when driving high capacitance, making it ideal for driving long coaxial cables or other high-capaci-tance loads. Most high-speed op amps are only able to drive limited capacitance.
Note: increasing load capacitance does reduce the speed of the device. In applications where the load capacitance reduces the speed of the op amp to an unacceptable level, the effect of the load capacitance can be reduced by add-ing a small resistor (<100Ω) in series with the output.
Feedback Resistor SelectionConventional op amp gain configurations and resistor selec-tion apply, the MIC920 is NOT a current feedback device.Also, for minimum peaking, the feedback resistor should have low parasitic capacitance, usually 470Ω is ideal. To use the part as a follower, the output should be connected to input via a short wire.Layout ConsiderationsAll high speed devices require careful PCB layout. The follow-ing guidelines should be observed: Capacitance, par-ticularly on the two inputs pins will degrade performance; avoid large copper traces to the inputs. Keep the output signal away from the inputs and use a ground plane.It is important to ensure adequate supply bypassing capaci-tors are located close to the device.
Power Supply BypassingRegular supply bypassing techniques are recommended. A 10µF capacitor in parallel with a 0.1µF capacitor on both the positive and negative supplies are ideal. For best perfor-mance all bypassing capacitors should be located as close to the op amp as possible and all capacitors should be low ESL (equivalent series inductance), ESR (equivalent series resis-tance). Surface-mount ceramic capacitors are ideal.Thermal ConsiderationsThe SC70-5 package and the SOT-23-5 package, like all small packages, have a high thermal resistance. It is important to ensure the IC does not exceed the maximum operating junction (die) temperature of 85°C. The part can be operated up to the absolute maximum temperature rating of 125°C, but between 85°C and 125°C performance will degrade, in par-ticular CMRR will reduce.An MIC920 with no load, dissipates power equal to the qui-escent supply current × supply voltage
PD(no load) = VV+ – VV- IS( )
When a load is added, the additional power is dissipated in the output stage of the op amp. The power dissipated in the device is a function of supply voltage, output voltage and output current.
PD(output stage) = VV+ – VOUT IOUT( )
Total Power Dissipation = PD(no load) + PD(output stage)
Ensure the total power dissipated in the device is no greater than the thermal capacity of the package. The SC70-5 pack-age has a thermal resistance of 450°C/W.
Max. Allowable Power Dissipation =
TJ(max) – TA(max)
450°C/W
March 2006 11 MIC920
MIC920 Micrel, Inc.
Package Information
SOT-23-5 (M5)
SC-70 (C5)
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USATEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2001 Micrel, Inc.