Analog Devices EVAL-AD5760 Manual de usuario

Evaluation Board User Guide

UG-436

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 16-Bit Serial Input, Voltage Output DAC with Integrated

Precision Reference Buffer Amplifiers

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 20

FEATURES

Full-featured evaluation board for the AD5760

Link options

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

demonstration platform

PC software for control

EVALUATION BOARD DESCRIPTION

The EVAL-AD5760 is a full-featured evaluation board designed

to allow the user to easily evaluate all features of the AD5760

voltage output, 16-bit digital-to-analog converter (DAC). The

AD5760 pins are accessible at on-board connectors for external

connection. The board can be controlled by two means: via the

on-board connector (J3), or via the system demonstration (SDP)

platform connector (J4). The SDP board allows the evaluation

board to be controlled through the USB port of a Windows®

XP-based (SP2 or later) or Vista-based (32-bit) computer using

the AD5760 evaluation software.

DEVICE DESCRIPTION

The AD5760 is a high precision, 16-bit DAC with integrated

precision reference buffer amplifiers designed to meet the

requirements of precision control applications. The output

range of the AD5760 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 AD5760 are provided in the

AD5760 data sheet, available from Analog Devices, and should

be consulted in conjunction with this user guide when using the

evaluation board.

FUNCTIONAL BLOCK DIAGRAM

AD5760 AD8675

INV

EXT

+10V

+5V

–5V

–10V

EXT

REFP

OUT_BUF

OUT

10851-001

REFN

OUT

PIN HEADER (J3)

SYSTEM

DEMONSTRATION

PLATFORM BOARD

USB

PORT

POWER SUPPLY INPUTS

Figure 1.

UG-436 Evaluation Board User Guide

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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

1/13—Revision 0: Initial Version

Evaluation Board User Guide UG-436

Rev. 0 | Page 3 of 20

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 AD5760. Alternatively, place Link 1 in

Position A to power the digital circuitry from the USB

port via the SDP board (default).

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

the positive analog supply of the AD5760.

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

the negative analog supply of the AD5760.

The analog and digital planes are connected at one location, close

to the AD5760. 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 Table 5.

Default Link Option Setup

The default link options are listed in Table 1. By default, the

board is configured with VREFP = +10 V and VREFN = −10 V for

a ±10 V output range.

Table 1. Default Link Options

Link No. Option

LK1 A

LK2 B

LK3

LK4 Removed

LK5 Removed

LK6 Removed

LK7 Removed

LK8 C

LK9 Inserted

LK11 Inserted

Connector J3 Pin Descriptions

Table 2. Connector J3 Pin Configuration

9 7 5 3 1

Table 3. Connector J3 Pin Descriptions

Pin No. Description

1 SDO

2 RESET

3 DGND

4 CLR

5 DGND

LDAC

7 SDIN

8 DGND

9 SCLK

10 SYNC

ON-BOARD CONNECTORS

There are nine connectors on the AD5760 evaluation board

PCB as outlined in Table 4.

Table 4. On-Board Connectors

Connector Function

J1 Digital power supply connector

J2 Analog power supply connector

J3 Digital interface pin header connector

J4 SDP board connector

VOUT DAC output connector

VOUT_BUF Buffered DAC output connector

VREF +5 V external reference voltage input connector

(+10 V, +5 V, −10 V, and −5 V reference voltages

are generated from this +5 V input or on-board

ADR4550)

VREFN DAC negative reference input connector

VREFP DAC positive reference input connector

UG-436 Evaluation Board User Guide

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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 J1.

LK2 This link selects the positive reference voltage source.

Position A selects an on-board generated +5 V.

Position B selects an on-board generated +10 V.

Position C selects an external voltage applied at Connector VREFP.

LK3 This link is used in conjunction with LK4 to configure the mode of operation of the output amplifier.

Position A configures the amplifier in unity gain. LK4 should be removed.1

Position B configures the amplifier for a gain of 2. LK4 should be inserted.2

LK4 This link is used in conjunction with LK3 to configure the mode of operation of the output amplifier.

When this link is inserted, LK3 should be in Position B to configure the amplifier for a gain of 2.2

When this link is removed, LK3 should be in Position A to configure the amplifier for unity gain.1

LK5 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.

LK6 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.

LK7 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.

LK8 This link selects the negative reference voltage source.

Position A selects an on-board generated −5 V.

Position B selects AGND.

Position C selects an on-board generated −10 V.

Position D selects an external voltage applied at Connector VREFN.

LK9 This link connects the output of Voltage Reference U5 to the reference scaling circuitry.

LK11 This link connects the DAC output to the noninverting input of the output buffer amplifier.

When this link is inserted, the DAC output is connected to the noninverting input of the output amplifier.

When this link is removed, the DAC output is disconnected from the noninverting input of the output buffer amplifier and the

DAC output voltage is accessible at the VOUT connector.

1The RBUF bit of the control register must be set to high to enable the unity gain mode of operation.

2The RBUF bit of the control register must be cleared to low to enable the gain of 2 mode of operation.

Evaluation Board User Guide UG-436

Rev. 0 | Page 5 of 20

EVALUATION BOARD SOFTWARE

SOFTWARE INSTALLATION

The AD5760 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 the setup.exe file from the CD.

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.

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

AD5760 evaluation board as described in the Power Supplies

section. Connect the SDP board (via either Connector A or

Connector B) to the AD5760 evaluation board and then

to the USB port of your PC using the supplied cable.

2. When the evaluation system is detected, proceed through any

dialog boxes that appear. This completes the installation.

SOFTWARE OPERATION

To launch the software, complete the following steps:

1. From the Start menu, select Analog Devices – AD5760 >

AD5760 Evaluation Software. The main window of the

software then displays (see Figure 3).

2. If the evaluation system 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, wait a few seconds, click Rescan, and follow

the instructions.

10851-002

Figure 2. Connectivity Error Alert

10851-003

Figure 3. Main Window

UG-436 Evaluation Board User Guide

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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).

10851-004

Figure 4. Program Voltage Window

Measure DAC Output

The Measure DAC Outputsection 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, first configure the

multimeter via its front panel before taking a measurement.

Figure 6 shows the measurement options. The software runs

through a sequence of steps, programming the DAC register

and measuring the DAC output voltage. The sequence 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 measurements

can be inserted, if required. The GPIB address of the multi-

meter must be specified.

To begin the measurement, click START. The measurement can

be halted at any time by clicking STOP. 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 the DAC code, the second column is the DAC voltage in volts,

and the third column is the INL error in LSBs, as shown in

Figure 5. A graph of both the DAC output voltage vs. the DAC

code and the INL error vs. the 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 65,535 in total 256 measurements. With

the number of power line cycles (NPLC) setting on the multimeter

set to 1, the measurement takes ~18 sec to complete. To complete

an all codes measurement requiring 65,536 measurement points

takes ~1.5 hours to complete.

10851-005

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-436

Rev. 0 | Page 7 of 20

10851-006

Figure 6. Measure DAC Output Window

UG-436 Evaluation Board User Guide

Rev. 0 | Page 8 of 20

EVALUATION BOARD PERFORMANCE

The following data demonstrates the measured linearity performance of the AD5760 evaluation board circuit. The board is powered from

VDD = +15 V and VSS = −15 V. VREFP = +10 V and VREFN = −10 V are both generated from the on-board voltage reference.

INL(LSB)

–0.10

–0.08

–0.06

–0.04

–0.02

0.02

0.04

0.06

0.08

0.10

010000 20000 30000 40000 50000 60000 70000

DAC CODE

REFP

= +10V

REFN

= –10V

= +15V

= –15V

AD8675 OUTPUT BUFFER

= 25°C

10851-007

Figure 7. INL Error vs. DAC Code

–0.10

–0.08

–0.06

–0.04

–0.02

0.02

0.04

0.06

0.08

0.10

010000 20000 30000 40000 50000 60000 70000

DNL(LSB)

DAC CODE

10851-008

REFP

= +10V

REFN

= –10V

= +15V

= –15V

AD8675 OUTPUT BUFFER

= 25°C

Figure 8. DNL Error vs. DAC Code

Evaluation Board User Guide UG-436

Rev. 0 | Page 9 of 20

EVALUATION BOARD SCHEMATICS AND ARTWORK

AD5760BCPZ

10851-009

Figure 9. Schematic of the AD5760 Circuitry

UG-436 Evaluation Board User Guide

Rev. 0 | Page 10 of 20

10851-010

Figure 10. Schematic of the Voltage Reference Circuitry

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