ANALOG DEVICES UG-144 Service Manual

Evaluation Board User Guide

UG-144

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

Evaluation Board for Quad, 16-Bit, Serial Input, Voltage Output DAC

FEATURES

Full featured evaluation board for the AD5064
On-board reference
On-board ADC for voltage readback
Various link options
Direct hookup to USB port of PC
PC software for control of DACs

EQUIPMENT NEEDED

IBM-compatible PC
Cable (supplied in kit)

SOFTWARE NEEDED

AD5064 evaluation software (supplied in kit)

DOCUMENTS NEEDED

AD5064
AD7476
ADG738
ADG774
REF195

GENERAL DESCRIPTION

This user guide describes the evaluation board for the AD5064
quad 16-bit digital-to-analog convertor (DAC). The AD5064
operates from a single 4.5 V to 5.5 V supply. There is an external
reference, which is the REF195 on this evaluation board.

Complete specifications for the AD5064 are found in the data
sheet available from Analog Devices, Inc., and should be con­sulted in conjunction with this user guide when using the
evaluation board.

The evaluation board interfaces to the USB port of an IBM®­compatible PC. Software is available with the evaluation board
allowing the user to easily program the AD5064.

EVALUATION BOARD CONNECTION DIAGRAM

5V VOLTAGE

B

REF

V

AD5064

REFERENCE

C

D

REF

REF

V

V

V

A

OUT

V

B

OUT

V

C

OUT

V

D

OUT

ADG738

8:1 MUX

ADC

07866-001

POWER SUPPLY INPUTS

USB CONNECTOR

CONTROLLER

CY7C68013

EXT REF A
EXT REF B
EXT REF C
EXT REF D

SMB CONNECTORS

A

REF

V

I/O

Figure 1.

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

UG-144 Evaluation Board User Guide

TABLE OF CONTENTS

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

Equipment Needed ........................................................................... 1

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

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

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

Evaluation Board Connection Diagram ........................................ 1

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

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

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

REVISION HISTORY

6/10—Revision 0: Initial Version

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

Evaluation Board Software ...............................................................4

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

Software Operation .......................................................................4

Evaluation Board Schematics and Artwork ...................................5

Ordering Information .......................................................................9

Bill of Materials ..............................................................................9

Related Links ......................................................................................9

Rev. 0 | Page 2 of 12

Evaluation Board User Guide UG-144

EVALUATION BOARD HARDWARE

POWER SUPPLIES

To power the EVAL-AD5064EBZ, supply 5.5 V between the
AVDD and AGND inputs for the analog supply of the AD5064.
Alternatively, placing Link 6 in Position B powers the analog
circuitry from the USB port (default setting).

Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close to
the AD5064. To avoid ground loop problems, do not 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 also
decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant
ground plane.

Table 2. Link Functions

Link No. Function

LK1 to LK4

LK5 This link selects the AVDD power supply source for the analog circuitry.
Position A selects J6 as the AVDD analog circuitry power supply source.
Position B selects the 5 V power supply source as the AVDD analog circuitry power supply source (see LK6).
LK6 This link selects the 5 V power supply source for the digital circuitry.
Position A selects J7 as the 5 V digital circuitry power supply source.
Position B selects the USB port as the 5 V digital circuitry power supply.
LK7

Position A selects control by the PC via the USB port.
Position B selects control by an external source via the SMB connectors (J1 to J5).
LK8

Position A allows normal operation of the switch.
Position B resets the switch.
LK9 This link selects the AVDD power supply source for the REF195.
Position A selects J6 as the REF195 power supply source.
Position B selects the AVDD as the REF195 power supply source (see LK5).
LK10 This link selects the DAC power supply source.
Position A selects the AVDD as the DAC power supply source.
Position B selects an external source via SMB Connector EXT_VDD as the power supply source.
LK11 This link selects the DAC voltage source.
Position A selects the DAC power supply source as the DAC voltage source (see LK10).
Position B selects the on-board REF195 5 V reference as the DAC voltage source.
LK12 This link selects whether the part power-on resets to zero or midscale.
Position A ensures that the POR of the part resets to midscale.
Position B ensures that the POR of the part resets to zero scale.
LK13 to LK16 These links select the reference sources for V
Position A selects an external reference via the SMB connectors (EXT_REF_A, EXT_REF_B, EXT_REF_C, and EXT_REF_D).
Position B selects the on-board REF195 5 V reference as the reference source.

These links connect the V
monitor the DAC output value using the on-board AD7476 ADC.

This link selects whether the AD5064 evaluation board is controlled by the PC via the USB port or by an external
source via the SMB connectors (J1 to J5).

This link sets the RESET

A to V

OUT

pin on the ADG738.

D pins of the AD5064 to the input/output pins of the ADG738 demultiplexer to

OUT

Rev. 0 | Page 3 of 12

LINK OPTIONS

A number of link and switch options on the evaluation board

be set for the required operating setup before using the

should
board. The functions of these link options are described in
detail in Tabl e 2. The default setup is for control by the PC via
the USB port. The default link options are listed in Tab le 1.

Table 1. Link Options Setup for PC Control (Default)

Link No. Option

LK1 to LK4 Inserted
LK5 B
LK6 B
LK7 A
LK8 A
LK9 B
LK10 A
LK11 A
LK12 A
LK13 to LK16 B

REF

A to V

REF

D.

UG-144 Evaluation Board User Guide

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The AD5064 evaluation kit includes self-installing software on CD.
The software is compatible with Microsoft® Windows® 2000 and
Windows XP.

To ensure that the board is correctly recognized when con­nected to the PC, install the software before connecting the
evaluation board to the USB port of the PC.

1. Start the Windows operating system and insert the CD.

2. The installation software should launch automatically. If it

does not, run the setup.exe file directly from the CD.

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

AD5064 evaluation board as described in the Power Supplies
section. Connect the evaluation board to the USB port of
the PC using the cable that is supplied.

4. When the software detects the evaluation board, proceed

through any dialog boxes that appear until the installation
is completed.

SOFTWARE OPERATION

1. From the Analog Devices menu, click Start > All

Programs > Analog Devices > AD5064 > AD5064
Evaluation Software.

For older PCs, click Start > Programs > Analog Devices
> AD5064 > AD5064 Evaluation Software.

The main window of the AD5064 evaluation software opens, as
shown in Figure 2. The data programmed into the 32-bit input
shift register is displayed. You can select the command bits, the
address bits, and the data bits by clicking the appropriate option
button under each section.

Command Bits

1. To select a command to program the part, click the drop-

down menu button under the Select Control Function
section and select the appropriate option from the menu.
For example, to program all DAC outputs with full scale,
click Write to and Update DAC Channel n.

2. Click All DACs in the Address Bits section.

3. In the Data section, enter the data in hexadecimal value.

4. To execute, click Wr ite to P art. You must click Writ e to

Part to execute all writes to the part.

Other commands that the AD5064 evaluation software allows
you to program include the power-down DAC bits, the clear code
register bits, and the register bits by clicking the corresponding
option button under the Select Control Function section and
then clicking Write to Part . You can also set the register bits for
the required mode of operation. Consult the AD5064 data sheet
for details.

Hardware Pins

LDAC

To set
checkbox,
screen dedicated to the hardware pins. This command executes

immediately; therefore, there is no need to click Wri te t o Pa r t.

and

LDAC

CLR

high or low, click the corresponding

CLR

or

, located on the right portion of the

ADC

The voltage output on each DAC channel is monitored using
the on-board ADC. To read the output voltage, click the OK
button under the Sample ADC section and select which channel
to read (A, B, C, or D) under the ADC section.

7866-002

Figure 2. AD5064 Evaluation Software Main Window

Rev. 0 | Page 4 of 12