Analog Devices EVAL-AD5781 Manuale utente

Evaluation Board User Guide

UG-184

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 a 18-Bit Serial Input, Voltage Output DAC

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 16

FEATURES

Full-featured evaluation board for the AD5781

Link options

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

development platform

PC software for control

EVALUATION BOARD DESCRIPTION

The EVAL-AD5781 is a full-featured evaluation board, designed

to allow the user to easily evaluate all features of the AD5781

voltage output, 18-bit DAC. The AD5781 pins are accessible at

on-board connectors for external connection. The board can be

controlled by two means, via the on-board connector (J6) or via

the system development platform connector (J3). The SDP

board allows the evaluation board to be controlled through the

USB port of a Windows® XP (SP2 or later) or Vista (32-bit)

based PC using the AD5781 evaluation software.

DEVICE DESCRIPTION

The AD5781 is a high precision, 18-bit digital-to-analog con-

verter (DAC), designed to meet the requirements of precision

control applications. The output range of the AD5781 is confi-

gured 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 and should

be consulted in conjunction with this user guide when using the

evaluation board.

FUNCTIONAL BLOCK DIAGRAM

POWER SUPPLY INPUTS

SYSTEM DEVELOPMENT

PLATFORM BOARD

PIN HEADER (J6)

USB

PORT

AD5781

POSITIVE

REFERENCE

NEGATIVE

REFERENCE

OUT

9092-001

Figure 1.

UG-184 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

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

Evaluation Board Description......................................................... 1

Device Description........................................................................... 1

Functional Block Diagram .............................................................. 1

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

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

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

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

On-Board Connectors ................................................................. 3

Evaluation Board Software...............................................................5

Software Installation .....................................................................5

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

Main Window ................................................................................6

Evaluation Board Performance........................................................8

Evaluation Board Schematics and Artwork...................................9

Ordering Information.................................................................... 15

Bill of Materials........................................................................... 15

REVISION HISTORY

8/10—Revision 0: Initial Version

Evaluation Board User Guide UG-184

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The following external supplies must be provided:

•5 V between the VCC and DGND inputs for the digital

supply of the AD5781. Alternatively, place Link 1 in

Position A to power the digital circuitry from the USB

port (default).

•7.5 V to 16.5 V between the VDD and AGND inputs for the

positive analog supply of the AD5781.

•−2.5 V to −16.5 V between the VSS and AGND inputs for

the negative analog supply of the AD5781.

The analog and digital planes are connected at one location,

close to the AD5781. To avoid ground loop problems, it is

recommended not to connect AGND and DGND elsewhere

in the system.

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.

LINK OPTIONS

The link options on the evaluation board should be set for the

required operating setup before using the board. The functions

of the link options are described in Tabl e 5.

Default Link Option Setup

The default link options are listed in Table 1 .

Table 1. Default Link Options

Link No. Option

LK1 A

LK3 A

LK4 Removed

LK5 Removed

LK6 Removed

LK8 A

LK9 C

Connector J6 Pin Descriptions

Table 2. Connector J6 Pin Configuration

9 7 5 3 1

10 8 6 4 2

Table 3. Connector J6 Pin Descriptions

Pin No. Description

1 SDO

2 RESET

3 DGND

4 CLR

5 IOVCC

6 LDAC

7 SDIN

8 DGND

9 SCLK

10 SYNC

ON-BOARD CONNECTORS

There are nine connectors on the AD5781 evaluation board

PCB as outlined in Table 4.

Table 4. On-Board Connectors

Connector Function

J1 Analog power supply connector

J2 Digital power supply connector

J3 SDP board connector

J6 Digital interface pin header connector

VOUT DAC output connector

VOUT_BUF Buffered DAC output connector

VREF 5 V voltage reference input connector (+10 V

and −10 V reference voltages are generated

from 5 V input)

VREFN DAC negative reference input connector

VREFP DAC positive reference input connector

UG-184 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

Table 5. Link Options

Link No. Description

LK1 This link selects the source of the digital power supply.

Position A selects the source from the SDP board.

Position B selects the source from Connector J2.

LK3 This link selects the voltage source for the IOVCC pin.

Position A connects IOVCC to VCC.

Position B selects an externally applied voltage at Pin 5 of J6.

LK4 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.

LK5 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.

LK6 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.

LK8 This link selects the positive reference source.

Position A selects an on-board generated 10 V, derived from 5 V applied at Connector VREF.

Position B selects an external voltage applied at Connector VREFP.

LK9 This link selects the negative reference source.

Position A selects an external voltage applied at Connector VREFN.

Position B selects AGND.

Position C selects an on-board generated −10 V, derived from 5 V applied at Connector VREF.

Evaluation Board User Guide UG-184

Rev. 0 | Page 5 of 16

EVALUATION BOARD SOFTWARE

SOFTWARE OPERATION

SOFTWARE INSTALLATION

To launch the software, complete the following steps:

The AD5781 evaluation kit includes self-installing software on a

CD. The software is compatible with Windows XP (SP2) and

Vista (32-bit). If the setup file does not run automatically, you

can run setup.exe from the CD.

1. From the Start menu, select Analog Devices – AD5781 >

AD5781 Evaluation Software. The main window of the

software is displayed (see Figure 3).

Install the evaluation software before connecting the evaluation

board and SDP board to the USB port of the PC to ensure that

the evaluation system is correctly recognized when connected to

the PC.

2. If the evaluation system is not connected to the USB port

when the software is launched, a connectivity error is

displayed (see Figure 2). Connect the evaluation board to

the USB port of the PC, wait a number of seconds, and

click Rescan. Follow the instructions.

1. After installation from the CD is complete, power up the

AD5781 evaluation board as described in the Power

Supplies section. Connect the SDP board (Connector A) to

the AD5781 evaluation board and then to the USB port of

your PC using the supplied cable.

9092-002

2. When the evaluation system is detected, proceed

through any dialog boxes that appear. This completes

the installation.

Figure 2. Connectivity Error Alert

09092-003

Figure 3. Main Window

UG-184 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

MAIN WINDOW

The main window is divided into three tabs: Configure,

Program Voltage, and Measure DAC Output.

Configure

The Configure section allows access to the control register,

clearcode register, software control register, and DAC register

and also allows control of the RESET, CLR, and LDAC pins.

Program Voltage

The Program Voltage section programs the DAC register with

a value calculated from the entered values: the positive voltage

reference (VREFP), the negative voltage reference (VREFN),

and the desired output voltage (see Figure 4).

09092-004

Figure 4. Program Voltage Window

Measure DAC Output

The Measure DAC Output section allows the PC to control an

Agilent 3458A multimeter to measure and log the DAC output

voltage.

The multimeter is controlled over a general-purpose interface

bus (GPIB). Once connected to the PC, the multimeter should

first be configured via its front panel before taking a measure-

ment. Figure 6 shows the measurement options. The software

runs through a sequence of steps, programming the DAC

begins with the software programming the DAC with the Start

Code value, incrementing the programmed value at each step

by the Code Step value, and finishing when the programmed

value reaches the Stop Code value. A delay between measure-

ments can be inserted if required. The GPIB address of the

multimeter must be specified.

To begin the measurement, click the START button. The

measurement can be halted at anytime by clicking the STOP

button. When the measurement is completed, a dialog box

appears to allow the data to be saved as a spreadsheet file

with three columns of data. The first column is DAC code,

the second column is DAC voltage in volts, and the third

column is INL error in LSBs, as shown in Figure 5. A graph

of both DAC output voltage vs. DAC code and INL error vs.

DAC code is displayed on-screen (see Figure 6). In the

measurement example shown in Figure 6 measurements are

taken in 256 code steps beginning at Code 0 and finishing

at Code 261,888, in total 1023 measurements. With the number

of power line cycles (NPLC) setting on the multimeter set to 1,

the measurement takes ~75 sec to complete. To complete an all

codes measurement requiring 262,144 measurement points

takes ~6 hours to complete.

09092-006

Figure 5. Saved Data Format

If an Agilent 3458A multimeter is not connected to the PC,

the software steps through the codes without taking any

measurements.

Evaluation Board User Guide UG-184

Rev. 0 | Page 7 of 16

09092-005

Figure 6. Measure DAC Output Window

UG-184 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD PERFORMANCE

The following data demonstrates the measured linearity performance of the AD5781 evaluation board circuit. The board is powered from

VDD = +15 V, VSS = −15 V, and VREF = +5 V.

0.5

0.4

0.3

0.2

0.1

–0.4

–0.3

–0.2

–0.1

–0.5 0 50k 100k 150k 200k 250k

INL ERROR (LSB)

DAC CODE

09092-007

Figure 7. INL Error vs. DAC Code

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

–0.05

–0.10

–0.15

–0.20

–0.25

–0.30

–0.50

–0.45

–0.40

–0.35

20k

40k

60k

80k

100k

120k

140k

160k

180k

200k

220k

240k

262,143

DNL ERROR (LSBs)

DAC CODE

09092-008

Figure 8. DNL Error vs. DAC Code

Evaluation Board User Guide UG-184

Rev. 0 | Page 9 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

09092-009

Figure 9. Schematic of the AD5781 Circuitry

UG-184 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

09092-010

Figure 10. Schematic of the Voltage Reference Scaling Circuitry

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