Analog Devices EVAL-AD5678DBZ Manuale utente

EVAL-AD5678DBZ User Guide

UG-987

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 AD5678 4 × 12-Bit and 4 × 16-Bit, Octal-Channel,

Voltage Output DAC

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 13

FEATURES

Full featured evaluation board in conjunction with the

nanoDAC® motherboard (EVAL-MBnanoDAC-SDZ)

On-board references

Various link options

PC control in conjunction with Analog Devices, Inc., system

demonstration platform (SDP)

PACKAGE CONTENTS

EVAL-AD5678DBZ evaluation board

EVAL-MBnanoDAC-SDZ motherboard

SOFTWARE NEEDED

EVAL-AD5678DBZ evaluation software

HARDWARE NEEDED

EVAL-SDP-CB1Z (SDP-B) board, must be purchased

separately

DOCUMENTS NEEDED

Electronic version of the AD5678 data sheet

Electronic version of the EVAL-AD5678DBZ user guide

GENERAL DESCRIPTION

This user guide details the operation of the evaluation board for

the AD5678 octal channel, voltage output, digital-to-analog

converter (DAC).

The evaluation board is designed to help users quickly prototype

new AD5678 circuits and reduce design time. The AD5678

operates from a single 2.7 V to 5.5 V supply.

For full data, see the AD5678 data sheet, which must be consulted

in conjunction with this user guide when using the evaluation

board.

The evaluation board interfaces to the USB port of a PC via the

SDP-B board. Software is available for download from the EVAL-

AD5678DBZ evaluation board page to allow the user to program

the AD5678.

EVAL-AD5678DBZ, EVAL-MBnanoDAC-SDZ, AND SDP-B BOARDS

14523-001

Figure 1.

UG-987 EVAL-AD5678DBZ User Guide

Rev. A | Page 2 of 13

TABLE OF CONTENTS

Features .............................................................................................. 1

Package Contents.............................................................................. 1

Software Needed ............................................................................... 1

Hardware Needed ............................................................................. 1

Documents Needed.......................................................................... 1

General Description ......................................................................... 1

EVAL-AD5678DBZ, EVAL-MBnanoDAC-SDZ, and SDP-B

Boards................................................................................................. 1

Revision History ............................................................................... 2

Evaluation Board Hardware ............................................................ 3

Motherboard Power Supplies...................................................... 3

Link Options ..................................................................................3

Evaluation Board Software Quick Start Procedures.....................4

Installing the Software ..................................................................4

Running the Software ...................................................................4

Software Operation .......................................................................5

Evaluation Board Schematics and Artwork...................................7

EVAL-MBnanoDAC-SDZ Motherboard ...................................7

EVAL-AD5678DBZ Daughter Board ...................................... 10

Ordering Information.................................................................... 12

Bill of Materials........................................................................... 12

REVISION HISTORY

11/2017—Rev. 0 to Rev. A

Change to Table 5 ........................................................................... 12

3/2017—Revision 0: Initial Version

EVAL-AD5678DBZ User Guide UG-987

Rev. A | Page 3 of 13

EVALUATION BOARD HARDWARE

MOTHERBOARD POWER SUPPLIES

The EVAL-MBnanoDAC-SDZ motherboard supports single

and dual power supplies.

The EVAL-AD5678DBZ evaluation board can be powered either

from the SDP port or externally by the J5 and J6 connectors, as

described in Table 1.

Both the AGND and DGND inputs are provided on the board.

The AGND and DGND planes are connected at one location on

the EVAL-MBnanoDAC-SDZ. It is recommended that AGND

and DGND not be connected elsewhere in the system to avoid

ground loop problems.

All supplies are decoupled to ground with 10 µF tantalum and

0.1 µF ceramic capacitors.

Table 1. Power Supply Connectors

Connector No. Label Voltage

J5, Pin 1 (J5-1)

VDD

Analog positive power supply, V

Single supply 5 V, dual supply 5 V.

J5, Pin 2 (J5-2) AGND Analog ground.

J5, Pin 3 (J5-3) VSS Analog negative power supply, VSS.

Dual supply −5 V.

J6, Pin 1 (J6-1) VLOGIC Digital supply from 1.8 V to VDD.

J6, Pin 2 (J6-2)

DGND

Digital ground.

LINK OPTIONS

A number of link options are incorporated in the E VA L -

MBnanoDAC-SDZ and must be set for the required operating

conditions before using the board. Table 2 describes the positions of

the links to control the evaluation board via the SDP-B board

using a PC and external power supplies. The functions of these

link options are described in detail in Table 3. The positions listed

in Table 2 and Table 3 match the evaluation board imprints (see

Figure 12).

Table 2. Link Options Setup for SDP-B Control (Default)

Link No. Position

REF1 EXT

REF2 EXT

REF3 EXT

REF4

EXT

LK5 C

LK6 3.3V

LK7 B

Table 3. Link Functions

Link Number Function

REF1 to REF4 These links select the reference source.

Position EXT selects an off-board voltage reference via the appropriate EXT_REF_x connector.

Position VDD selects VDD as the reference source.

Position 4.096V selects the on-board 4.096 V reference as the reference source.

Position 2.5V selects the on-board 2.5 V reference as the reference source.

Position 5V selects the on-board 5 V reference as the reference source, V

= 5.5 V.

LK5 This link selects the positive DAC analog voltage source.

Position A selects the internal voltage source from the SDP-B board.

Position B selects the internal voltage source 3.3 V from the ADP121 on the motherboard.

Position C selects an external supply voltage, VDD.

LK6

This link selects the VLOGIC voltage source.

Position 3.3V selects the digital voltage source from the SDP-B board, 3.3 V.

Position VLOGIC selects an external digital supply voltage, VLOGIC.

LK7

This link selects the negative DAC analog voltage source.

Position A selects VSS.

Position B selects AGND.

UG-987 EVAL-AD5678DBZ User Guide

Rev. A | Page 4 of 13

10954-003

EVALUATION BOARD SOFTWARE QUICK START PROCEDURES

INSTALLING THE SOFTWARE

The EVAL-AD5678DBZ evaluation software is compatible with

Windows® Vista (64-bit/32-bit), and Windows 7 (64-bit/32-bit).

The software must be installed before connecting the SDP-B board

to the USB port of the PC to ensure that the SDP-B board is

recognized by the PC.

To install the software, take the following steps:

1. Start the Windows operating system. Download the

installation software from the EVAL-AD5678DBZ

evaluation board page.

2. Run the setup.exe file from the installer folder if it does not

open automatically.

3. After installation is completed, power up the evaluation

board as described in the Motherboard Power Supplies

section.

4. Connect the evaluation board to the SDP-B board and the

SDP-B board into the PC using the USB cable included in

the evaluation kit.

5. When the software detects the evaluation board, click

through any dialog boxes that appear to finalize the

installation.

RUNNING THE SOFTWARE

To run the program, take the following steps:

1. Connect the evaluation board to the SDP-B board and

connect the USB cable between the SDP-B board and the PC.

2. Power up the evaluation board as described in the

Motherboard Power Supplies section.

3. From the Start menu, click All Programs, Analog Devices,

AD5678 Evaluation Software.

4. If the SDP-B board is not connected to the USB port when

the software is launched, a connectivity error displays (see

Figure 2). Connect the evaluation board to the USB port of

the PC and wait a few seconds. When the SDP-B board is

detected, the display is updated (see Figure 3).

Alternatively, the software can be used without an evaluation

board. The software runs in simulation mode displaying expected

outputs based on the input data. The main window of the AD5678

evaluation software then opens, as shown in Figure 4.

14523-002

Figure 2. Connectivity Error

14523-003

Figure 3. Hardware Select

EVAL-AD5678DBZ User Guide UG-987

Rev. A | Page 5 of 13

14523-004

Figure 4. AD5678 Evaluation Software Main Window

SOFTWARE OPERATION

The software for the AD5678 allows the user to program values

to the DAC REGISTER of the DAC.

Write to Input Register

Click Write to Input Register to load the code of the input data

control to the input register of the selected DAC in the DAC

selection box.

Update DAC Register from Input Register

Click Update DAC Register from Input Register to copy the

value in the input register to the corresponding DAC register.

The DAC outputs are automatically updated with the appropriate

voltage.

Write to Input and DAC Registers

Click Write to Input and DAC Registers to load the code of the

input data control to the input register and DAC register of the

selected DAC. The DAC outputs are automatically updated with

the appropriate voltage.

LDAC Control

Click Pulse LDAC to bring the LDAC pin low and then back

high. This action copies the data from the input register to the

DAC register, and the output updates accordingly.

Alternatively, the LDAC pin can be set to logic high or logic low

by selecting the corresponding LDAC HIGH or LDAC LOW

option.

Power-Down Control

Each DAC can be powered down individually. Click the POWER-

DOWN LOGIC blue progressive disclosure option to access the

Powerdown Configuration window, as shown in Figure 5. The

selected DAC can operate in normal operation or one of the three

different power-down, pull-down termination options. When the

power-down setting for each DAC is selected, click OK to write

the appropriate values to the AD5678.

14523-005

Figure 5. Powerdown Configuration Window

UG-987 EVAL-AD5678DBZ User Guide

Rev. A | Page 6 of 13

Reference Control

The DAC has an on-chip reference with an internal gain of 2.

Click the blue progressive option on the REFERENCE INPUT

block to access the Reference Input window, as shown in Figure 6,

which allows the user to select between the on-chip reference or

external reference voltage.

14523-006

Figure 6. Reference Input Window

When using an external reference, write the actual value of the

reference voltage in the External Reference (V) input box to make

sure that the software reflects the voltage output correctly.

LDAC Mask Register

Each DAC can be configured to respond to or override the LDAC

pin settings in the LDAC control. Click the blue progressive

disclosure option on the INTERFACE LOGIC block to access

the LDAC Register window, as shown in Figure 7. When the

LDAC selections are completed, click OK to write the appropriate

values to the AD5678. The LDAC REGISTER indicator lights

up accordingly when an LDAC mask of a DAC is enabled.

14523-007

Figure 7. LDAC Register Window

EVAL-AD5678DBZ User Guide UG-987

Rev. A | Page 7 of 13

EVALUATION BOARD SCHEMATICS AND ARTWORK

EVAL-MBnanoDAC-SDZ MOTHERBOARD

EXT_VDD

VLOGIC

GND

EXT_VSS

SDP

STANDARD

CONNECTOR

PARALLEL

PORT

SPORT

SPI

I2C

GENERAL

INPUT/OUTPUT

TIMERS

*NC ON BLACKFIN SDP 120

119

118

GND

117

GND

116

VIO(+3.3V)

115

GND

114

PAR_D22*

113

PAR_D20*

112

PAR_D18*

111

PAR_D16*

110

PAR_D15

109

GND

108

PAR_D12

107

PAR_D10

106

PAR_D8

105

PAR_D6

104

GND

103

PAR_D4

102

PAR_D2

101

PAR_D0

100

PAR_WR

PAR_INT

GND

PAR_A2

PAR_A0

PAR_FS2

PAR_CLK

GND

SPORT_RSCLK

SPORT_DR0

SPORT_RFS

SPORT_TFS

SPORT_DT0

SPORT_TSCLK

GND

SPI_SEL_A

SPI_MOSI

SPI_MISO

SPI_CLK

GND

SDA_0

SCL_0

GPIO1

GPIO3

GPIO5

GND

GPIO7

TMR_B

TMR_D

CLK_OUT

GND

WAKE

SLEEP

GND

UART_TX

BMODE1

60 RESET_IN

59 UART_RX

58 GND

57 RESET_OUT

56 EEPROM_A0

55 NC

54 NC

53 NC

52 GND

51 NC

50 NC

49 TMR_C*

48 TMR_A

47 GPIO6

46 GND

45 GPIO4

44 GPIO2

43 GPIO0

42 SCL_1

41 SDA_1

40 GND

39 SPI_SEL1/SPI_SS

38 SPI_SEL_C

37 SPI_SEL_B

36 GND

35 SPORT_INT

34 SPI_D3*

33 SPI_D2*

32 SPORT_DT1

31 SPORT_DR1

30 SPORT1_TDV*

29 SPORT0_TDV*

28 GND

27 PAR_FS1

26 PAR_FS3

25 PAR_A1

24 PAR_A3

23 GND

22 PAR_CS

21 PAR_RD

20 PAR_D1

19 PAR_D3

18 PAR_D5

17 GND

16 PAR_D7

15 PAR_D9

14 PAR_D11

13 PAR_D13

12 PAR_D14

11 GND

10 PAR_D17*

9PAR_D19*

8PAR_D21*

7PAR_D23*

6GND

5USB_VBUS

4GND

3GND

2NC

1VIN

J10

1A0

2A1

3A2

4VSS

VCC 7

WP 6

SCL 5

SDA

24LC32

100kΩ

DNP

DGND AGND

BEAD

1.6Ω

C11

4.7µF

C10

0.1µF

+C7

10µF

1VIN

2GND

3EN 4

VOUT

ADP121-AUJZ33

1µF C4

1µF

LK5

J6-1

J6-2

0.1µF

10µF

LK6

J5-1

J5-2

J5-3

0.1µF +

10µF

LK7

R7 100Ω

R5 100Ω

R6 100Ω

R8 100Ω

R9 100Ω

R10 100Ω

R11 100Ω

R12 100Ω

R13 100Ω

R14 100Ω

0.1µF

+C9

10µF

R15

100Ω

R16

DNP

GAIN

SCL

SDA

CS WR

DB0

DB2

DB4

DB6

DB8

DB10

DB1

DB3

DB5

DB7

DB9

DB11

+3.3V

DGND

+5V

USB_VBUS

+3.3V

VDD

+3.3V

DGND

VLOGIC

DGND

+3.3V

DGNDDGND

VSS

+5V

CLR

LDAC

SCLK

SDO

SDIN

SYNC

EXT_VDD

+5V DGND

DGND

14523-008

Figure 8. EVAL-MBnanoDAC-SDZ Motherboard SDP-B Connector and Power Supply

UG-987 EVAL-AD5678DBZ User Guide

Rev. A | Page 8 of 13

EX_REF_1 EX_REF_2 EX_REF_3 EX_REF_4

VREF_1 VREF_2 VREF_3 VREF_4

REF3

REF4

REF1

REF2

+5VREF

+2_5VREF

+4_096VREF

VREF1

+5VREF

+2_5VREF

+4_096VREF

VREF2

+5VREF

+2_5VREF

+4_096VREF

VREF3

+5VREF

+2_5VREF

+4_096VREF

VREF4

VDD VDD VDD VDD

14523-009

+2.5V +4.096V

C16

1µF

C15

1µF

OUTPUT

2VS

3SLEEP

GND

REF198

C17

1µF

+5V

+2.5V +4.096V

2VIN

5TRIM

VOUT

GND

ADR445ARMZ

2VIN

GND

TRIM

7COMP

VOUT

ADR431BRZ

+5VREF+2_5VREF +4_096VREF

VDD VDD

VDD

Figure 9. EVAL-MBnanoDAC-SDZ Motherboard Reference Voltage Selector Circuit

DAUGHTER BOARD CONNECTOR

SPI PMOD CONNNECTOR GPIO PMOD CONNNECTOR

I2C PMOD CONNNECTOR

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

SDIN SDO SCLK SYNC SCL LDAC CLR PD GAIN SDA

1 2

3 4

5 6

7 8

J8-1

J8-2

J8-3

J8-4

J8-5

J8-6

J7-1

J7-2

J7-3

J7-4

J7-5

J7-6

J3-1

J3-2

J3-3

J3-4

J3-5

J3-6

J4-1

J4-2

J4-3

J4-4

J4-5

J4-6

J4-7

J4-8

VDD

VREF1

VREF2

VREF3

VREF4

VLOGIC

SDASCL

SYNC

SCLK

SDO

SDIN LDAC

CLR

GAIN

DB6

DB7

DB8

DB9

DB0

DB1

DB2

DB3

VOUT_0

VOUT_1

VOUT_2

VOUT_3

VOUT_4

VOUT_5

VOUT_6

VOUT_7

SCL

SDA

DGND

VLOGIC

SCL

SDA

DGND

VLOGIC

SYNC

SDO

SDIN

SCLK

DGND

VLOGIC

GAIN

DGND

LDAC

CLR

VLOGIC

DGND

CS WR

DB11 DB5

DB10 DB4

AGND

14523-010

Figure 10. EVAL-MBnanoDAC-SDZ Motherboard Connectors to Daughter Board and Serial Interface

VOUT_0

VOUT_1

VOUT_2

VOUT_3

VOUT_4

VOUT_5

VOUT_6

VOUT_7

U10-A

AD8608ARUZ

–

U10-B

AD8608ARUZ

–

U10-C

AD8608ARUZ

–

13 14

U10-D

AD8608ARUZ

2–

U7-A

AD8616ARZ

6–

U7-B

AD8616ARZ

V+

V–

U7-C AD8616ARZ

2–

3+6

V–

V+

U11

AD8655

2–

3+6

V–

V+

U12

AD8655

VOUT_0

VOUT_1

VOUT_2

VOUT_3

VOUT_4

VOUT_5

VOUT_6

VOUT_7

VDD

VSS

VDD

VSS

14523-011

Figure 11. EVAL-MBnanoDAC-SDZ Motherboard Output Amplifier Circuit

EVAL-AD5678DBZ User Guide UG-987

Rev. A | Page 9 of 13

14523-012

Figure 12. EVAL-MBnanoDAC-SDZ Motherboard Component Placement

14523-013

Figure 13. EVAL-MBnanoDAC-SDZ Motherboard Top Side Routing

UG-987 EVAL-AD5678DBZ User Guide

Rev. A | Page 10 of 13

14523-014

Figure 14. EVAL-MBnanoDAC-SDZ Motherboard Bottom Side Routing

EVAL-AD5678DBZ DAUGHTER BOARD

VDD

14 GND

VOUT_A 13

VOUT_B 5

VOUT_C 12

VOUT_D 6

VOUT_E 11

VOUT_F 7

VOUT_G 10

VOUT_H

15 DIN

16 SCLK

2SYNC

9CLR

1LDAC

VREFIN/OUT

AD5678BRUZ-2

R1 DNP

R2 DNP

R3 DNP

R4 DNP

R5 DNP

R6 DNP

R7 DNP

R8 DNP

DNP

0.1µF

+C10

10µF

J3-1

J3-2

J3-3

J3-4

J3-5

J3-6

J4-1

J4-2

J4-3

J4-4

J4-5

J4-6

J4-7

J4-8

3 4

5 6

7 8

910

11 12

13 14

15 16

SDIN

SCLK

SYNC

VOUT_0

VOUT_1

VOUT_2

VOUT_3

VOUT_4

VOUT_5

VOUT_6

VOUT_7

VDD

VREF1

LDAC

CLR

VDD

VREF1

VREF2

VREF3

VREF4

VLOGIC

SDASCL

SYNC

SCLK

SDO

SDIN LDAC

CLR

GAIN

VOUT_0

VOUT_1

VOUT_2

VOUT_3

VOUT_4

VOUT_5

VOUT_6

VOUT_7

DB6

DB7

DB8

DB9

DB0

DB1

DB2

DB3

DGND

CS WR

DB11 DB5

DB10 DB4

AGND

14523-015

Figure 15. EVAL-AD5678DBZ Daughter Board Schematics

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