EVAL-AD5781SDZ User Guide UG-1555

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the AD5781 18-Bit, ±0.5 LSB INL, Voltage Output DAC with Single and Dual Supplies

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 26

FEATURES Full featured evaluation board for the AD5781 with the

ADP5070 power solution Power Solution generated from single 3.3 V supply. PC control in conjunction with Analog Devices, Inc.,

EVAL-SDP-CB1Z SDP PC software for control

EVALUATION KIT CONTENTS EVAL-AD5781SDZ evaluation board EV-ADR445-REFZ reference board

ADDITIONAL SOFTWARE NEEDED Analysis | Control | Evaluation (ACE) software, available for

download from the Analog Devices website

GENERAL DESCRIPTION This user guide supports the EVAL-AD5781SDZ evaluation board. UG-184 supports previous revisions of the evaluation board.

The EVAL-AD5781SDZ is a full-featured evaluation board, designed for the easy evaluation of all features of the AD5781 voltage output, 18-bit digital-to-analog converter (DAC). The AD5781 pins are accessible at on-board connectors for external connection. The evaluation board can be controlled by two means: via the on-board connector (J12) or via the system demonstration platform (SDP) connector (J14).

The evaluation board also integrates a power solution utilizing the ADP5070 switching regulator and linear regulators (ADP7118 and ADP7182) to generate a bipolar supply of up to −15 V and +15 V from a +3.3 V single supply. Alternatively, the DAC canbe supplied with linear power supplies via the on-board connectors (J11 and J13).

A daughter board connected to the top right of the evaluation board includes a voltage reference to externally apply to the DAC.

The EVAL-SDP-CB1Z SDP board allows the EVAL-AD5781SDZ evaluation board to be controlled through the USB port of a Windows®-based PC with the ACE evaluation software for the AD5781.

The AD5781 is a high precision, 18-bit DAC, designed to meet the requirements of precision control applications. The output range of the AD5781 is configured by two reference voltage inputs. The device is specified to operate with a dual power supply of up to 33 V.

Complete specifications for the AD5781 are available in the AD5781 data sheet available from Analog Devices, which must be consulted in conjunction with this user guide when using the evaluation board.

EVALUATION BOARD PHOTOGRAPH

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Figure 1. EVAL-AD5781SDZ

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TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Kit Contents .................................................................. 1 Additional Software Needed ........................................................... 1 General Description ......................................................................... 1 Evaluation Board Photograph ........................................................ 1 Revision History ............................................................................... 2 Evaluation Board Hardware ........................................................... 3

Power Supplies and Default Link Options ............................... 3 Power Solution (ADP5070)—Single-Supply Option .............. 4 Bench Power Supply—Dual Supply Option ............................. 4 Voltage Reference Daughter Board ........................................... 4 On-Board Connectors ................................................................. 7

Evaluation Board Software ...............................................................8 ACE Software Installation ............................................................8 Operating the ACE Software .......................................................8 Linearity Test Operation ..............................................................8

Evaluation Board Schematics and Artwork ................................ 12 AD5781 Carrier Board .............................................................. 12 ADR445 Reference Voltage Daughter Board ......................... 18 LTZ1000 Reference Voltage Daughter Board ........................ 20 LTC6655 Reference Voltage Daughter Board ........................ 22

Ordering Information.................................................................... 24 Bill of Materials .......................................................................... 24

REVISION HISTORY 4/2020—Revision 0: Initial Version

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EVALUATION BOARD HARDWARE POWER SUPPLIES AND DEFAULT LINK OPTIONS The EVAL-AD5781SDZ evaluation board can be powered using the on-board ADP5070 from a single voltage of 3.3 V to +5 V. The voltage sources available are an external single supply via the J11 connector and a supply sourced from the SDP controller board (EVAL-SDP-CB1Z).

Alternatively, the J13 connector can provide power to the board, instead of the ADP5070, and J13 is intended for use with well-regulated bench supplies (see Figure 2). With any of the possible options, set the link options on the evaluation board

for the required operating setup first, before supplying the evaluation board.

Each supply is decoupled to the relevant ground plane with 10 μF and 0.1 μF capacitors. Each device supply pin is again decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant ground plane.

The analog and digital planes are connected at one location close to the DAC. To avoid ground loop problems, do not connect AGND and DGND elsewhere in the system.

Table 1. Quick Start Jumper Configuration for ADP5070 and Bench Supply Link No. ADP5070 with LDOs ADP5070 Bench Supply LK2 Inserted Inserted RemovedLK5 Removed Inserted InsertedLK6 Removed Inserted Not applicableLK7 Removed Inserted Not applicableLK8 B B BLK9 B B ALK10 B B A

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AD5781

VDD

VSS

VCC

VREF

VCC

DGND

A

B

ADP7118

ADP7182

ADP7118

LK2LK7

LK6

LK5

IOVCC

LK10J11

VOLTAGE REFERENCEDAUGHTER BOARD

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LK8J12 PIN10

+3.3V SDP

A

B

C

Figure 2. Powering the EVAL-AD5781SDZ Evaluation Board

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POWER SOLUTION (ADP5070)—SINGLE-SUPPLY OPTION The EVAL-AD5781SDZ board is populated with an ADP5070 switching regulator. This regulator is preceded by voltage regulators (ADP7118 and ADP7182) that can be bypassed if required. The supplies generated from the ADP5070 alone or with the addition of the voltage regulators are −15 V and +15 V from a +3.3 V to +5V single supply. Link LK6 and Link LK7 must be inserted when the voltage regulators are bypassed.

The circuit was designed using the ADIsimPower toolset, which selects the components, generates the schematic and bill of materials, and displays the performance specifications. Visit the ADP5070 product page to download the design tools.

The ADP5070 requires a minimum voltage supply of 3.3 V for proper operation. Following the jumper configuration in Table 1 for the ADP5070 alone or the ADP5070 with low dropout regulators (LDOs) options, the evaluation board is supplied via the on-board J11 connector with an external 3.3 V single supply.

The J11 connector can be supplied with a range of 3.3 V to 5 V when Link LK5 is inserted, or with a range of 3.3 V to 18 V when Link LK5 is removed.

Link LK8 must be inserted to Position B if the board is supplied with a voltage larger than 3.3 V via the on-board J11 or J12 connectors.

Link LK1 must be inserted to Position A at all times. Refer to Table 3 for full link options.

BENCH POWER SUPPLY—DUAL SUPPLY OPTION The evaluation board can be powered using a bench supply to allow all output voltage ranges of the AD5781. A headroom and foot room of at least 2.5 V is required on the dual supply. It is important that the voltage across the negative analog supply (VSS) and positive analog supply (VDD) does not exceed the absolute maximum rating of 34 V. Otherwise, device reliability can be affected.

Following the jumper configuration in Table 1 for the bench supply configuration, supply the evaluation board with a dual supply of VSS = −15 V and VDD = 15 V via the J13 connector. The AD5781 also requires users to apply a single supply of 3.3 V to 5 V to the VCC pin and a single supply of 3.3 V to the IOVCC pin that can be sourced via the J11 connector or the on-board J12 connector. Select the position of Link LK8 depending on the preferred source to supply the VCC pin and the IOVCC pin. Link LK8 must be inserted to Position B if the board is supplied with a voltage larger than 3.3 V via the on-board J11 or J12 connectors. Select the position of Link LK1 to Position A at all times. Refer to Table 3 for full link options.

VOLTAGE REFERENCE DAUGHTER BOARD The daughter board inserted into Connector J1, Connector J4, and Connector J9 (available at the top right corner of the EVAL-AD5781SDZ evaluation board) includes a voltage reference. The voltage supplied by the voltage reference is gained up and inverted to provide the positive and negative reference voltages required by the AD5781, which are routed to the EVAL-AD5781SDZ board via the J4 connector.

ADR445 Reference Board

The EVAL-AD5781SDZ evaluation kit provides the EV-ADR445-REFZ reference board to complete the hardware required to evaluate the AD5781.

The ADR445 is a 5 V low noise reference with 3 ppm/°C maximum temperature drift and 2.25 µV p-p noise specifications across the operating temperature range. Figure 3 shows the typical integral nonlinearity (INL) performance.

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ADR445 REFERENCEEXTERNAL SUPPLY ON J13VDD = +15VVSS = –15V3458A DMM, NPLC = 10STEP SIZE = 256TA = 25°C

50000 100000 150000 200000 250000

Figure 3. AD5781 with ADR445 INL Performance

Link JP1 selects the source of the reference voltage between the ADR445 and an external 5 V reference voltage applied at the VR_EXT connector. Refer to Table 2 for the link details.

Table 2. JP1 Link Reference Voltage Selection JP1 Link Position Reference Voltage Selection A ADR445 B 5 V external reference voltage applied at

VR_EXT connector

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LTZ1000 and LTC6655 Reference Boards

The EV-LTZ1000-REFZ and EV-LTC6655-REFZ reference boards, including the LTZ1000 and LTC6655 voltage references respectively, are also available to evaluate the AD5781.

The LTZ1000 reference board components maintain the accuracy of the AD5781. The LTZ1000 is a 7.2 V ultraprecision reference specified with 0.05 ppm/°C temperature drift and ultra-low 1.2 µV p-p noise. The voltage reference is used in conjunction with low drift amplifiers (ADA4077-2) and a low drift, thermally matched resistor for the scaling and gain circuits. Place a cover over the reference board to reduce thermal errors due to air currents flowing over the reference board. Figure 4 shows the typical INL performance using the LTZ1000 reference.

The LTC6655 reference board offers improved noise and temper-ature drift performance over the ADR445 solution. The LTC6655 is a low noise, low drift precision reference with 2 ppm/°C temper-ature drift and 1.25 µV p-p noise. Figure 5 shows the typical INL performance of the AD5781 using the LTC6655 reference.

A minimum external unipolar supply of 3.3 V is required to supply the EVAL-AD5781SDZ with the EV-LTZ1000-REFZ board or with the EV-LTC6655-REFZ board combination. Alternatively, external dual supplies can supply the motherboard and daughter board.

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LTZ1000 REFERENCEEXTERNAL SUPPLY ON J13VDD = +15VVSS = –15V3458A DMM, NPLC = 10STEP SIZE = 256TA = 25°C

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Figure 4. AD5781 with LTZ1000 INL Performance

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LTC6655 REFERENCEEXTERNAL SUPPLY ON J13VDD = +15VVSS = –15V3458A DMM, NPLC = 10STEP SIZE = 256TA = 25°C

Figure 5. AD5781 with LTC6655 INL Performance

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Table 3. Link Options Link No. Description LK1 This link selects the source of the digital power supply from Connector J11. Position A must be selected at all times.

Position A selects the source from the SDP board. Position B selects the source from Connector J12.

LK2 This link selects whether or not the power solution on the board is used to supply the AD5781. When this link is inserted, the ADP5070 dc-to-dc switch is used to supply the AD5781 in single supply. When this link is removed, the ADP5070 dc-to-dc switch is bypassed.

LK3 This link selects the state of the LDAC pin.

When this link is inserted, LDAC is at logic low.

When this link is removed, LDAC is at logic high.

LK4 This link selects the state of the RESET pin.

When this link is inserted, RESET is at logic low.

When this link is removed, RESET is at logic high.

LK5 This link selects the voltage source for the digital supply VCC pin. When this link is inserted, the digital supply is sourced from an external 3.3 V single supply (Connector J11) with Link LK1 on position A. Note that the J11 connector can be supplied with a range of 3.3 V to 5.5 V when Link LK5 is inserted. When this link is removed, the digital supply is sourced from the adjusted voltage generated by the ADP5070 and regulated by the ADP7118. Note that the J11 connector can be supplied with a range of 3.3 V to 18 V when Link LK5 is removed.

LK6 This link selects whether the ADP7118 regulator is included in the VDD source circuit. When this link is inserted, the ADP7118 regulator is bypassed. When this link is removed, the ADP7118 regulator adjusts the positive analog supply generated by the ADP5070 power solution.

LK7 This link selects whether the ADP7182 regulator is included in the VSS source circuit. When this link is inserted, the ADP7182 regulator is bypassed. When this link is removed, the ADP7182 regulator adjusts the negative analog supply generated by the ADP5070 power solution.

LK8 This link selects the voltage source for the IOVCC pin. Position A selects an externally applied voltage at Pin 10 of Connector J12. Position B selects the source from the SDP board. This position must be used when VCC is larger than 3.3V. Position C connects IOVCC to VCC.

LK9 This link selects the voltage source for the negative analog supply VSS. Position A selects the source from the voltage externally applied at VSS of Connector J13. Position B selects the source from the negative voltage generated by the ADP5070 and adjusted by an ADP7182 regulator, depending on the position of Link LK7.

LK10 This link selects the voltage source for the positive analog supply VDD. Position A selects the source from the voltage externally applied at VDD of Connector J13. Position B selects the source from the positive voltage generated by the ADP5070 and adjusted by an ADP7118 regulator, depending on the position of Link LK6.

LK11 This link selects the state of the CLR pin.

When this link is inserted, CLR is at logic low.

When this link is removed, CLR is at logic high.

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ON-BOARD CONNECTORS Table 4 shows the connectors on the EVAL-AD5781SDZ.

Table 4. On-Board Connectors Connector Function J1 to J9 Voltage reference daughter board connectors J11 Digital power supply connector J12 Digital interface pin header connector J13 Analog power supply connector J14 SDP board connector VO DAC output connector VO_BUF Buffered DAC output connector VR_EXT 5 V voltage reference input connector

Connector J12 Pin Descriptions

Figure 6 and Table 5 show the Connector J12 pins.

2 4 6 8 10

1 3 5 7 9

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Figure 6. Connector J12 Pin Configuration

Table 5. Connector J12 Pin Descriptions Pin No. Description 1 CLR

2 LDAC

3 RESET

4 SCLK 5 SDIN 6 SDO 7 SYNC

8 DGND 9 DGND 10 IOVCC

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EVALUATION BOARD SOFTWARE ACE SOFTWARE INSTALLATION The ACE software configures the AD5781 over a USB port. The ACE software and complete software instructions are available for download from the Analog Devices website. The ACE installer includes the drivers for the SDP-B board and plugins for various Analog Devices evaluation boards, including the EVAL-AD5781SDZ.

After the ACE software is installed, connect the evaluation board to the SDP-B controller board, and plug the USB cable from the PC to the SDP-B controller board. Allow a few seconds for the operating system to recognize the SDP-B board.

OPERATING THE ACE SOFTWARE To operate the ACE software, take the following steps:

1. From the Start menu, navigate to All Programs > AnalogDevices > ACE. The software opens, displaying the Starttab, and recognizes the EVAL-AD5781SDZ (see Figure 7).

2. Double-click the EVAL-AD5781SDZ icon in the Attached Hardware pane to open the AD5781 chip tab (see Figure 7,Figure 8, and Figure 9).

3. Double-click the EVAL-AD5781SDZ icon under Attached Hardware, as shown in Figure 7, to open the AD5781 tab(see Figure 9). This tab displays the block diagram andallows the configuration of the DAC input registers andcontrol registers. The hardware registers and the fields inthe Configuration pane shown in Figure 9 are not altereduntil the user clicks Apply Changes. The GPIO values arenot altered until the user clicks Apply GPIOs.

4. Click Proceed to Memory Map (Label 9 in Figure 11) toopen the AD5781 Memory Map tab and allow access to allregisters (see Figure 10). The hardware registers in theAD5781 are not altered until the user clicks Apply Changes.

For a details on the GUI options, see Table 6, Figure 11, and Figure 12.

LINEARITY TEST OPERATION To operate the linearity test for the AD5781, see the AD5791 ACE Remote Control page on the Analog Devices website, and follow the instructions to operate the hardware and software, set up the Python environment, and begin communication between the ACE software and the Python script.

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Figure 7. Start Tab for the EVAL-AD5781SDZ ACE Software

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Figure 8. AD5781 Tab for the EVAL-AD5781SDZ ACE Software

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Figure 9. AD5781 Chip Tab the for EVAL-AD5781SDZ ACE Software

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Figure 10. AD5781 Memory Map Tab for the EVAL-AD5781SDZ ACE Software

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Figure 11. Main Window for the EVAL-AD5781SDZ ACE Software

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Note that the first write to the device configures the control register and initializes the AD5781.

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Figure 12. Configuration Pane in the ACE Software

Table 6. GUI Options1 Label GUI Element Description

1 Apply Changes Click to submit any changes on the GUI to the hardware of the evaluation boards. 2 Reset Chip Issues a hardware reset and reverts the software and hardware registers to their default settings. 3 Configuration Configure the DAC by writing to the internal Control Register. Click Apply Changes to submit any

changes in the settings. 4 Apply GPIOs Submits any changes on the GPIOs. 5 Input Register The user can input data to write to the input register. 6 DAC Register Graphical representation of the DAC register. 7 Internal Amplifier Status Graphical representation of the configuration of the internal amplifier. 8 Output Ground

Configuration Graphical representation of the output ground configuration. To modify the open/close status, click the switch, and then click Apply Changes to submit the change.

9 Proceed to Memory Map Click to open the AD5781 Memory Map tab (see Figure 10).

1 See Figure 11.

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EVALUATION BOARD SCHEMATICS AND ARTWORK AD5781 CARRIER BOARD

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Figure 15. LDO Schematics (ADP7118 and ADP7182) from the Power Solution Circuitry

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AD

8675

AR

Z

0.1UF

0

AD

5781

BR

UZ

DNI

220PF

AD

8676

BR

MZ

AG

ND

0.1UF

10UF

10PFDNI

AG

ND

AG

ND

10UF

DNI

AD

8676

BR

MZ

0.1UF

0.1UF

10UF

AG

ND

10UF1

10UF

10UF1

10UF

0.1UF

0.1UF 0.1UF

0.1UF

0.1UF

AG

ND

0.1UF

AD

8676

BR

MZ

0 0 000 0

AG

ND

10K

AG

ND

10K

10K

10K

10UF

U1

R12

R11

R10

R9

R18

R16

R15

R14

R13

R17

U2

U2

C29

C26

C24

C32

C30

C21

C18

C16C14

R19

C25 C31

C33C27

C28

U2C20

C19

C17

C22

C15

U3

C23

C13

SD

O

VO

UT_

BU

F

VS

S_D

AC

VO

UT

VD

D_D

AC

SD

O_T

P

VS

S_D

AC

RE

FN

SY

NC

_N_T

P

SD

IN_T

P

SC

LK_T

P

VC

C_D

AC

VS

S_D

AC

VD

D_D

AC

RE

FP

SC

LK LDA

C_N

_TP

CLR

_N_T

P

RE

SE

T_N

SY

NC

_N

LDA

C_N

CLR

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SD

IN

IOV

CC

_DA

CIO

VC

C_D

AC

RE

SE

T_N

_TP

VD

D_D

AC

18

3 4

17162

59

14

11

12 13

20

68

10

1

15

7

19

1

3 2

7

56

NP

NP

NP

NP

N P

NP

NPNP

48

4

7

6

81

2 3

IN IN IN

OU

T

INININ

IN

OU

T

OU

T OU

T

IN

V–

V+

ININININININ

IN

IN

IN

INO

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N1

V+

V–

OU

T

RFB

AG

ND

VS

S

VR

EFN

S

VR

EFN

F

DG

ND

SY

NC

_N

SC

LK

SD

IN

SD

O

IOV

CC

VC

C

LDA

C_N

CLR

_N

RE

SE

T_N

VD

D

VR

EFP

F

VR

EFP

S

VO

UT

INV

IN

20451-015

Figure 16. Schematic of the AD5781 Circuitry

UG-1555 EVAL-AD5781SDZ User Guide

Rev. 0 | Page 16 of 26

AGND

FX8-120S-SV(21)

AGND

AGND

24LC64-I/SN

U4

J14

SCLK

+3.3V

SYNC_N

LDAC_N

TP_10TP_11

TP_1TP_2TP_3

CLR_N

SDIN

SDO

+3.3V

RESET_N

TP_12

TP_4 7

4

8

56321

65

116

1

5

6259

72497348

87

89

3029 92

9032

88

3191

3837

85

39

8483

3433

82

64

35

41 8042 79

57

60

1002199

26 9527

7 1148 1139 112

10 111110

1213 10814 10715 10616 105

18 10319 10220 101

22

94

24 9725 96

120119

70

68676655

5453

5150

2

7447

764577447843

118117

115

109

104

98

93

86

81

75

69

6358

52

46

40

36

28

23

17

11

6

43

56

71

61

IN

VSS

VCC

WP

A2A1A0

SCLSDA

OUT OUTOUTOUT

OUT

OUTOUT

IN

ININ

IN

IN

IN

IN

IN

SPI_SEL_A

CLKOUT

NCNC

GNDGND

VIO(+3.3V)GND

PAR_D22PAR_D20PAR_D18PAR_D16PAR_D15

GNDPAR_D12PAR_D10

PAR_D8PAR_D6

GNDPAR_D4PAR_D2PAR_D0

PAR_WR_NPAR_INT

GNDPAR_A2PAR_A0

PAR_FS2PAR_CLK

GNDSPORT_RSCLK

SPORT_DR0SPORT_RFSSPORT_TFSSPORT_DT0

SPORT_TSCLKGND

SPI_MOSISPI_MISO

SPI_CLKGND

SDA_0SCL_0GPIO1GPIO3GPIO5

GNDGPIO7

TMR_BTMR_D

NCGND

NCNCNC

WAKE_NSLEEP_N

GNDUART_TXBMODE1RESET_IN_N

UART_RXGNDRESET_OUT_NEEPROM_A0NCNCNCGNDNCNCTMR_CTMR_AGPIO6GNDGPIO4GPIO2GPIO0SCL_1SDA_1GNDSPI_SEL1/SPI_SS_NSPI_SEL_C_NSPI_SEL_B_NGNDSERIAL_INTSPI_D3SPI_D2SPORT_DT1SPORT_DR1SPORT_TDV1SPORT_TDV0GNDPAR_FS1PAR_FS3PAR_A1PAR_A3GNDPAR_CS_NPAR_RD_NPAR_D1PAR_D3PAR_D5GNDPAR_D7PAR_D9PAR_D11PAR_D13PAR_D14GNDPAR_D17PAR_D19PAR_D21PAR_D23GNDUSB_VBUSGNDGNDNCVIN

2045

1-01

6

Figure 17. Schematic of the SDP Board Connector

2045

1-01

7

Figure 18. Component Placement Schematic

EVAL-AD5781SDZ User Guide UG-1555

Rev. 0 | Page 17 of 26

2045

1-01

8

Figure 19. Top Printed Circuit Board (PCB) Layer Schematic

2045

1-01

9

Figure 20. Bottom PCB Layer Schematic

UG-1555 EVAL-AD5781SDZ User Guide

Rev. 0 | Page 18 of 26

ADR445 REFERENCE VOLTAGE DAUGHTER BOARD

AG

ND

10kΩ

DN

I

DNI

0.1µF

DN

ID

NI

AD

A40

77-2

BR

Z

10kΩ

DNI

DN

I

DN

I

10kΩ

10kΩ

10kΩ

10kΩ

10kΩ

DN

I

10kΩ

0.1µ

F

DNI

DN

I

10µF

AD

A40

77-2

BR

Z

10kΩ

AG

ND

AG

ND

DN

I

AG

ND

10kΩ

AG

ND

AG

ND

AD

R44

5BR

Z

DN

I

AG

ND

0.1µF

0.1µF

10kΩ

DN

I

10kΩ

AD

A40

77-2

BR

Z10kΩ

0.1µ

F

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

MIL

L-M

AX

SO

CK

ET

(F)

MIL

L-M

AX

SO

CK

ET

(F)

VD

D

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

VS

S

MIL

L-M

AX

SO

CK

ET

(F)

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

RD

NI

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

M20

-999

0345

10kΩ

AG

ND

350-

10-1

03-0

0-00

6000

MIL

L-M

AX

SO

CK

ET

(M)

10µF

0.1µF

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

C6

J9

JP1

J2

R7

U2

U2

VR

_EX

T

J7

J1

J6J5

R25

R23

R20

R24

C8

C7

R8R5

R4

R6

C5

C2

C1 C3

J4

R1

R22

U2

R21

R2

R3

U1

J8

C4

J3

VR

EFN

VR

EFP

VS

S

VD

D

VS

S

VD

D

1

64

2

21

3

21 3

248

12 3

5

54

2

1

32131

21

321

NP NP

321

2

573

31 2

8

7

3

6

3

1

3

NC

NC

TRIM

VIN

GN

D

TPTP

VO

UT

V–

V+

BA

204551-020

Figure 21. Schematic of the EV-ADR445-REFZ

EVAL-AD5781SDZ User Guide UG-1555

Rev. 0 | Page 19 of 26

2045

1-02

1

Figure 22. EV-ADR445-REFZ Component Placement Schematic

2045

1-02

2

Figure 23. EV-ADR445-REFZ Top PCB Layer Schematic

2045

1-02

3

Figure 24. EV-ADR445-REFZ Bottom PCB Layer Schematic

UG-1555 EVAL-AD5781SDZ User Guide

Rev. 0 | Page 20 of 26

LTZ1000 REFERENCE VOLTAGE DAUGHTER BOARD

SIN

GLE

GN

D S

TAR

PO

INT

FOR

ALL

CO

NN

EC

TIO

NS

HE

RE

MIL

L-M

AX

SO

CK

ET

(F)

25K

10UF

10UF

10UF

10UF

10UF

0.1UF

0.1UF

0.1UF

0.1UF

0.1UF

1ME

G

DN

I

AG

ND

AG

ND

2N39

04TF

AD

A40

77-2

BR

Z

10K

/10K

0.1U

F

1K

0.1U

F

LTZ1

000A

CH

#PB

F

AG

ND

DN

I

1K

68K

68K

AD

A40

77-2

BR

Z

AD

A40

77-2

BR

Z

0.1U

FDN

I

AG

ND

0.1UF

1N27

0

AD

A40

77-2

BR

ZA

DA

4077

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RZ

0.1U

F

120

AD

A40

77-2

BR

Z1.

5K

1N27

0

15K

10K

DN

ID

NI

DN

I

DN

I

DN

I

10K

MIL

L-M

AX

SU

PP

LY S

OC

KE

T (M

) CO

NN

ETO

R

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

MIL

L-M

AX

SO

CK

ET

(F)

MIL

L-M

AX

SO

CK

ET

(F)

VD

D

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

R

VS

S

MIL

L-M

AX

HE

AD

ER

(M) C

ON

NE

CTO

RM

ILL-

MA

X H

EA

DE

R (M

) CO

NN

EC

TOR

C5C1

Q1

C7C3

C24

R49

R44

C22

R42R41

D2

U5

R20R40

R39

C23

C13

R8

C12

R48

D1

R43

R45

R46

C2

C4

C6

C8

J4

J5J6

J1

J2 J3

J7J8

C50

C51

U2

U2

U2

U1

U1

U1

J9

VD

D

VS

S

VD

D

VR

EFN

VR

EFP

1

23 1

CA

1 2

3 4

5

67

8

P N

12

3

CA

P N

P N

P N

P N

2 3

1 2 3

1 2 3

1 2 3

1 2 3 1 2 3

1 2 3

1 2 35 67

321

8 4

8 4

5 67

3 21

1 2 3

IN

IN IN

V-

V+

V-

V+

20451-024

Figure 25. Schematic of the EV-LTZ1000-REFZ

EVAL-AD5781SDZ User Guide UG-1555

Rev. 0 | Page 21 of 26

2045

1-02

5

Figure 26. EV-LTZ1000-REFZ Component Placement Schematic

2045

1-02

6

Figure 27. EV-LTZ1000-REFZ Top PCB Layer Schematic

2045

1-02

7

Figure 28. EV-LTZ1000-REFZ Bottom PCB Layer Schematic

UG-1555 EVAL-AD5781SDZ User Guide

Rev. 0 | Page 22 of 26

LTC6655 REFERENCE VOLTAGE DAUGHTER BOARD

MIL

L-M

AX

SOC

KET

(F)

MIL

L-M

AX

HEA

DER

(M) C

ON

NEC

TOR

MIL

L-M

AX

SOC

KET

(F)

MIL

L-M

AX

HEA

DER

(M) C

ON

NEC

TOR

MIL

L-M

AX

HEA

DER

(M) C

ON

NEC

TOR

MIL

L-M

AX

SOC

KET

(F)

MIL

L-M

AX

HEA

DER

(M) C

ON

NEC

TOR

MIL

L-M

AX

HEA

DER

(M) C

ON

NEC

TOR

MIL

L-M

AX

SOC

KET

(M)

C13

C12

R11

C9

R10

R9

C10

C11

2187 63

PAD

4

5

U1

6721

8 53 4

U3

48U

2

12 3

U2

765

U2

321J9

321J7

321J8

321J3

321J2

321J1

321J6

321J5

R22

R25

R23

R20

R24

R21

C8

C7

R8

R7

R3

R5

R2

R1

R4

R6

C6

C5

NPC2

NPC4

C1 C3

321J4

AG

ND

AD

A40

77-2

BR

Z

VREF

P

DN

I

10K

AG

ND

AG

ND

DNI

0.1u

F

2.2u

F

AG

ND

VREF

N

10K

1uF

1uF

LTC

6655

BH

MS8

-5#P

BF

10K

AD

A40

77-2

BR

Z

DN

I

AG

ND D

NI

10K

DN

I

0.1u

F

DN

I

10K

DN

I

10K

10K

10K

10K

10K

DNI

10K

DNI

AG

ND

10K

AG

ND

10K

10K

AD

A40

77-2

BR

Z

10uF

VDD

10K

0.1u

F AG

ND

100K

10K

AG

ND

VSS

10uF10uF

0.1uF 0.1uF

AG

ND

DN

I

AD

P711

8AR

DZ

DN

I

AG

ND

AG

ND

1000

0PF

AG

ND

VDD

VSS

1uF

AG

ND

DN

I

DN

I

DN

I

350-

10-1

03-0

0-00

6000

VOU

TVI

N

PAD

VIN

SSEN

GN

D

SEN

SE/A

DJ

VOU

TG

ND

V OU

T_F

V OU

T_S

GN

DG

ND

GN

DV I

N

SHD

N

V-V+

20451-028

Figure 29. Schematic of the EV-LTC6655-REFZ

EVAL-AD5781SDZ User Guide UG-1555

Rev. 0 | Page 23 of 26

2045

1-02

9

Figure 30. EV-LTC6655-REFZ Component Placement Schematic

2045

1-03

0

Figure 31. EV-LTC6655-REFZ Top PCB Layer Schematic

2045

1-03

1

Figure 32. EV-LTC6655-REFZ Bottom PCB Layer Schematic

UG-1555 EVAL-AD5781SDZ User Guide

Rev. 0 | Page 24 of 26

ORDERING INFORMATION BILL OF MATERIALS

Table 7. AD5781 Carrier Board Reference Designator Part Description Part Number C1, C3, C5, C14, C16, C18, C21, C24, C26, C30, C32

Capacitors, 3528, 10 μF TAJB106K016RNJ

C2, C41, C42 Capacitors, 1206, 50 V, 2.2 μF, ±10% UMK316BJ225KL-T C4, C6, C13, C15, C17, C22, C25, C27 to C29, C31, C33

Capacitors, 0603, 25 V, 0.1 μF, ±10% C1608X8R1E104K

C34, C40 Capacitors, 0603, 6.3 V, 1 μF, ±20% JMK107B7105MA C35 Capacitor, 0805, 10 V, 10 μF, ±20% TACH106M010XTA C36, C37 Capacitors, 1206, 50 V, 4.7 μF, ±20% C3216X7R1H475M160AC C38 Capacitor, 0603, 16 V, 0.022 μF, ±10% 0603YC223KAT2A C39 Capacitor, 0603, 16 V, 0.082 μF, ±10% CL10B823KO8NNNC C43, C44 Capacitors, 0603, 10 V, 2.2 μF, ±10% GRM188R71A225KE15D C45, C47 Capacitors, 0603, 16 V, 1 μF, ±10% CGA3E1X7R1C105K080AC C46, C48 Capacitors, 0805, 25 V, 2.2 μF, ±10% GCM21BR71E225KA73L C8 Capacitor, 0603, 50 V, 27 pF, ±5% 2238 867 15279 C9 Capacitor, 0603, 50 V, 22 pF, ±5% CC0603JRNP09BN220 D2 Schottky diode DFLS130-7 D3 Schottky diode BAT54LPS J1 to J9 3-position female headers, single-row connectors, 2.54 mm pitch 310-13-103-41-001000 J11 2-position terminal block (3.81 mm pitch) 1727010 J12 10-position male header connector (3.81 mm pitch) M20-9980546 J13 3-pin terminal block (3.81 mm pitch) 1727023 J14 120-way connector, 0.6 mm pitch FX8-120S-SV(21) J4 3-position, male header single row connector, 2.54 mm pitch 350-10-103-00-006000 L1, L2, L3 Surface mount power inductors 7427920415 L6 Surface mount power inductor LPS6235-153MRB L7 Surface mount power inductor XFL4020-152MEB L8 Surface mount power inductor LPS4018-222MRB L9 Surface mount power inductor LPS6235-682MRB LK1, LK9, LK10 3-pin single inline (SIL) header M20-9990345 LK2 to LK7, LK11 2-contact headers, two rows, through hole 69157-102 LK8 6-pin header 61300621121 R0, R13 to R19, R37, R39 Resistors, 0 Ω, 0.0625 W, 1%, 0603 MC0603WG00000T5E-TC R9 to R12 Resistors, 10 kΩ, 0.0625 W, 1%, 0603 MC0063W0603110K R20, R26 Resistors, 30.1 kΩ, 0.1 W, 1%, 0603 ERJ-3EKF3012V R21 Resistor, 18.7 kΩ, 0.1 W, 1%, 0603 ERJ-3EKF1872V R22 Resistor, 4.7 Ω, 0.1 W, 1%, 0603 ERJ-3RQF4R7V R23 Resistor, 63.4 kΩ, 0.0625 W, 1%, 0402 ERJ-2RKF6342X R24 Resistor, 3.57 kΩ, 0.1 W, 1%, 0402 ERJ-2RKF3571X R25 Resistor, 22 kΩ, 0.1 W, 1%, 0603 CRCW060322K0FKEA R27 Resistor, 2.8 kΩ, 0.1 W, 1%, 0402 ERJ-2RKF2801X R28 Resistor, 54.9 kΩ, 0.1 W, 1%, 0402 ERJ-2RKF5492X R29, R31, R34 Resistors, 10 Ω, 0.1 W, 1%, 0603 ERJ-3EKF10R0V R30 Resistor, 1 Ω, 0.0625 W, 5%, 0402 CRCW04021R00JNED R32, R35 Resistors, 105 kΩ, 0.1 W, 1%, 0603 ERJ-3EKF1053V R33, R36 Resistors, 10 kΩ, 0.1 W, 1%, 0603 ERJ-3EKF1002V R42 Resistor, 49.9 kΩ, 0.1 W, 1%, 0603 ERJ-3EKF4992V TP1 to TP7, TP9, TP10 Red test points TP-104-01-02 U1 18-bit, ±0.5 LSB INL, voltage output DAC AD5781BRUZ U2 Ultraprecision, 36 V, 2.8 nV/√Hz, dual, rail-to-rail output op amp AD8676BRMZ

EVAL-AD5781SDZ User Guide UG-1555

Rev. 0 | Page 25 of 26

Reference Designator Part Description Part Number U3 36 V precision, 2.8 nV/√Hz rail-to-rail output op amp AD8675ARZ U4 64 kb I2C serial electrically erasable programmable read only memory

(EEPROM) 24LC64-I/SN

U5 1 A/0.6 A dc to dc switching regulator with independent positive and negative outputs

ADP5070ACPZ-R7

U6 20 V, 200 mA, low noise, CMOS LDO linear regulator, 3.3 V fixed output voltage

ADP7118ARDZ-3.3

U7 20 V, 200 mA, low noise, CMOS LDO linear regulator ADP7118ARDZ U8 −200 mA, low noise linear regulator ADP7182ACPZN VO, VO_BUF Straight PCB mount Subminiature Version B (SMB) jacks, 50 Ω 1-1337482-0 Not Applicable Shorting links on LK1, LK9, and LK10, 2.54mm pitch, contact center QPC02SXGN-RC

Table 8. ADR445 Daughter Board Reference Designator Part Description Part Number C1, C3, C5, C6 Capacitors, 0603, X8R, 25 V, 0.1 μF, ±10% C1608X8R1E104K C2, C4 Capacitors, 3528, 16 V, 10 μF, ±10% TAJB106K016RNJ J1 to J9 3-position male header, single-row connectors, 2.54 mm pitch 350-10-103-00-006000 J4 3-position female header, single-row connector, 2.54 mm pitch 310-13-103-41-001000 JP1 3-position header connector M20-9990345 + M7567-05 R1 to R8 Resistors, 10 kΩ, 0.125 W, 0.01%, 0805 ERA-6AEB103V U1 Ultralow noise, 5 V voltage reference ADR445BRZ U2 High precision dual amplifier ADA4077-2BRZ VR_EXT Straight PCB mount SMB jack, 50 Ω 1-1337482-0

Table 9. LTZ1000 Daughter Board Reference Designator Part Description Part Number C1, C3, C5, C7, C13, C22, C23, C24 Capacitors, 0603, 25 V, 0 μF, ±10% C1608X8R1E104K C2, C4, C6, C8, C12 Capacitors, 3528, 16 V, 1 μF, ±10% TAJB106K016RNJ D1, D2 Radio frequency (RF)/pin diodes 1N270 J1 to J9 3-position male header single row connectors, 2.54 mm pitch 350-10-103-00-006000 J4 3-position female header single row connector, 2.54 mm pitch 310-13-103-41-001000 Q1 Single ,bipolar junction transistor 2N3904TF R20 Resistor, 120 Ω, 0.6 W, 0.01%, through hole Y1453120R000T9 R39, R40 Resistors, 68 kΩ, 0.1 W, 0.1%, 0805 PCF0805-13-68K-B-T1 R41 Resistor, 15 kΩ, 0.6 W, 0.01%, through hole Y145315K0000T9 R42 Resistor, 1 kΩ, 0.6 W, 0.01%, through hole Y14531K00000T9 R43 Resistor, 10 kΩ, 0.6 W, 1%, through hole MRS25000C1002FRP00 R44 Resistor, 1 MΩ, 0.6 W, 1%, through hole MRS25000C1004FCT00 R45 Resistor, 10 kΩ, 0.6 W, 0.005%, through hole Y145310K0000V9L R46 Resistor, 25 kΩ, 0.6 W, 0.01%, through hole Y145325K0000T9 R48 Resistor, 10 kΩ/10 kΩ, 0.1W, 0.01%, 1505 Y1685V0001TT9 R49 Resistor, 1 kΩ, 0.6 W, 1%, through hole MRS25000C1001FRP00 R8 Resistor, 1.5 kΩ, 0.25 W, 1%, through hole CMF-551501FT-1 U1, U2 High precision dual amplifiers ADA4077-2BRZ U5 Ultraprecision reference LTZ1000ACH#PBF

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Table 10. LTC6655 Daughter Board Reference Designator Part Description Part Number C1, C3, C11 Capacitors, 0603, 25 V, 0.1 μF, ±10% C1608X8R1E104K080AA C2,C4 Capacitors, 3528, 16 V, 10 μF, ±10% TAJB106K016RNJ C5 Capacitor, 0603, 16 V, 1 μF, ±10% GRM188R61C105KA93D C6 Capacitor, 0805, 10 V, 1 μF, ±10% CL21B106KPQNNNE C9 Capacitor, 0603, 25 V, 1 nF, ±10% C1608X7R1E103K C10 Capacitor, 0805, 25 V, 2.2 μF, ±10% GRM21BR71E225KA73L C12, C13 Capacitors, 0603, 10 V, 1 μF, ±10% GRM188R71A105KA61D J1 to J9 3-position male headers, single-row connectors, 2.54 mm pitch 350-10-103-00-006000 J4 3-position female header, single-row connector, 2.54 mm pitch 310-13-103-41-001000 R1, R2, R3, R4, R5, R6, R7, R8 Resistors, 0805, 10 kΩ, 0.125 W, 0.1% ERA-6AEB103V R10, R11 Resistors, 0603, 10 kΩ, 0.1 W, 1% ERJ-3EKF1002V R9 Resistor, 0603, 100 kΩ, 0.1 W, 1% ERJ-3EKF1003V U1 Low dropout regulator ADP7118ARDZ U2 High precision dual amplifiers ADA4077-2BRZ U3 Low noise, low drift precision reference LTC6655BHMS8-5#PBF

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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