Analog Devices EVAL-AD5254SDZ Manuale utente

Evaluation Board User Guide

UG-236

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 AD5254 Digital Potentiometer

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 AD5254

Several test circuits

Various ac/dc input signals

PC control via a separately purchased system development

platform (SDP)

PC control software

12 extra bytes in EEMEM for user-defined information

Resistor tolerance error stored in EEMEM

PACKAGE CONTENTS

EVAL-AD5254SDZ evaluation board

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5254 data sheet

Electronic version of the UG-236 document

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5254—a quad-channel, 256-position, nonvolatile memory

digital potentiometer. With versatile programmability, the AD5254

allows multiple modes of operation, including read/write access

in the RDAC and EEMEM registers, increment/decrement of

resistance, resistance changes in ±6 dB scales, wiper setting read-

back, and extra EEMEM for storing user-defined information,

such as memory data for other components or a lookup table.

The AD5254 supports a dual-supply ±2.25 V to ±2.75 V operation

and a single-supply 2.7 V to 5.5 V operation, making the device

suited for battery-powered applications and many other appli-

cations. In addition, the AD5254 uses a versatile I2C serial

interface that operates in fast mode, allowing speeds of up to

400 kbps and supporting the selection of up to four different I2C

addresses.

The EVAL -AD5254SDZ can operate in single-supply and dual-

supply mode and incorporates an internal power supply from

the USB.

Complete specifications for the AD5254 part can be found in

the AD5254 data sheet, which is available from Analog Devices,

Inc., and should be consulted in conjunction with this user

guide when using the evaluation board.

DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEVELOPMENT PLATFORM

EVAL-AD5254SDZ

SYSTEM DEVELOPMENT

PLATFORM

09579-001

Figure 1.

UG-236 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

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

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

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

Digital Picture of Evaluation Board with System Development

Platform ............................................................................................. 1

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

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

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

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

Test Circuits ...................................................................................4

Evaluation Board Software...............................................................6

Installing the Software ..................................................................6

Running the Software ...................................................................6

Software Operation .......................................................................7

Evaluation Board Schematics and Artwork...................................8

Ordering Information.................................................................... 14

Bill of Materials........................................................................... 14

REVISION HISTORY

1/11—Revision 0: Initial Version

Evaluation Board User Guide UG-236

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVAL -AD5254SDZ supports the use of single and dual

power supplies.

In single-supply mode, the evaluation board can be powered

either from the SDP port or externally by the J1-1, J1-2, and

J1-3 connectors, as described in Tabl e 1.

If dual-supply mode is required, the J1-1, J1-2, and J1-3 connectors

must provide the external power supply, as described in Tabl e 1.

All supplies are decoupled to ground using 10 µF tantalum and

0.1 µF ceramic capacitors.

Table 1. Maximum and Minimum Voltages of the Connectors

Connector No. Label Voltage

J1-1 EXT VDD Analog positive power supply, VDD.

For single-supply operation, it is

2.7 V to 5.5 V.

For dual-supply operation, it is

2.5 V to 2.75 V.

J1-2 GND Analog GND.

J1-3 EXT VSS Analog negative power supply, VSS.

For single-supply operation, it is 0 V.

For dual-supply operation, it is

−2.5 V to −2.75 V.

LINK OPTIONS

Several link and switch options are incorporated in the evalu-

ation board and should be set up before using the board. Table 2

describes the positions of the links to control the evaluation board

by a PC, via the SDP board, using the EVAL-AD5254SDZ in

single-supply mode. The functions of these link and switch

options are described in detail in Table 3 through Tabl e 6.

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

Link No. Option

A25 3.3 V

A24 GND

Table 3. Link Functions

Link No. Power Supply Options

A25 VDD This link selects one of the following as the positive power supply:

5 V (from SDP).

3.3 V (from SDP).

EXT VDD (external supply from the J1-1 connector).

A24 VSS This link selects one of the following as the negative power supply:

GND (analog ground).

VDD VSS (external supply from the J1-3 connector).

UG-236 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The EVAL-AD5254SDZ incorporates several test circuits to

evaluate the AD5254 performance.

DAC

RDAC0 can be operated as a digital-to-analog converter (DAC),

as shown in Figure 2.

09579-002

W1_BUF

RDAC0

AC + DC

VDD

B0 BUF-W1

VSS

GND

– V

R34

R35

Figure 2. DAC

Table 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Terminal Link Options Description

A0 A20 AC + DC Connects Terminal A0 to

(VDD − VSS)/2

VDD Connects Terminal A0 to VDD

W0 BUF-W1 Connects Terminal W0 to an

output buffer

B0 A21 DC

Connects Terminal B0 to

(VDD − VSS)/2

VSS Connects Terminal B0 to VSS

GND

Connects Terminal B0 to

analog ground

The output voltage is defined in Equation 1.

256

)( RDAC0

VVV B0

OUT  (1)

where:

RDAC0 is the code loaded in the RDAC0 register.

VA0 is the voltage applied to the A0 terminal (A20 link).

VB0 is the voltage applied to the B0 terminal (A21 link).

Using the R34 and R35 external resistors, you can reduce the

voltage of the voltage references. In this case, use the A1 and

B1 test points to measure the voltage applied to the A0 and B0

terminals and recalculate VA0 and VB0 in Equation 1.

AC Signal Attenuation

RDAC0 can be used to attenuate an ac signal, which must be

provided externally using the AC_INPUT connector, as shown

in Figure 3.

W1_BUF

RDAC0

AC + DC

C_INPUT

B0 BUF-W1

GND

–

R34

R35

1µF

R36

9579-003

VSS

– V

Figure 3. AC Signal Attenuator

Depending on the voltage supply rails and the dc offset voltage

of the ac signal, various configurations can be used, as described

in Table 5.

Table 5. AC Signal Attenuation Link Options

Voltage

Supply

Maximum

AC Signal

Amplitude Link Options Conditions

Single VDD A20 AC + DC No dc offset voltage

AC signal is outside

the voltage supply

rails due to the

dc offset voltage

DC offset voltage

≠ VDD/21

AC All other conditions

A21 DC

Use in conjunction

with AC + DC link

GND All other conditions

Dual VDD/VSS A20 AC + DC AC signal is outside

the voltage supply

rails due to the

dc offset voltage

DC offset voltage

≠ 0 V1

AC All other conditions

A21 GND

Use in conjunction

with AC + DC link

VSS All other conditions

1Recommended to ensure optimal total harmonic distortion (THD) performance.

The signal attenuation is defined in Equation 2.















 ENDTOEND

WWB

nAttenuatio 0

log20)dB( (2)

where:

RWB0 is the resistor between the W0 and B0 terminals.

RWis the wiper resistance.

REND-TO-END is the end-to-end resistance value.

Evaluation Board User Guide UG-236

Rev. 0 | Page 5 of 16

In addition, R36 can be used to achieve a pseudologarithmic

attenuation. To do so, adjust the R36 resistor until a desirable

transfer function is found.

Signal Amplifier

RDAC1 can be operated as an inverting or noninverting signal

amplifier supporting linear or pseudologarithmic gains. Table 6

shows the available configurations.

Table 6. Amplifier Selection Link Options

Amplifier Gain Link Label

Noninverting Linear A27 LINEAR

A29 NON-INVERTING

A30 NON- INVERTING

Pseudologarithmic A27 PSEUDOLOG

A29 NON- INVERTING

A30 NON- INVERTING

Inverting Linear A27 LINEAR

A29 INVERTING

A30 INVERTING

Pseudologarithmic A27 PSEUDOLOG

A29 INVERTING

A30 INVERTING

The noninverting amplifier with linear gain is shown in Figure 4,

and the gain is defined in Equation 3.

R38

GWB1

+= 1(3)

where RWB1is the resistor between the W1 and B1 terminals.

VIN

RDAC1

B1 R42

W1 B2

OUT

OAVOUT

10nF

R41

1.7kΩ

R38

2.7kΩ

09579-004

Figure 4. Linear Noninverting Amplifier

The noninverting amplifier with pseudologarithmic gain is

shown in Figure 5, and the gain is defined in Equation 4.

AW1

WB1

G+=1

(4)

where:

RWB1is the resistor between the W1 and B1 terminals.

RAW 1is the resistor between the A1 and W1 terminals.

VIN

RDAC1

B1A1 R42

W1 B2

VOUT

OAVOUT

10nF

R41

1.7kΩ

R43

09579-005

Figure 5. Pseudologarithmic Noninverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

The inverting amplifier with linear gain is shown in Figure 6,

and the gain is defined in Equation 5.

R38

GWB1

−= (5)

where RWB1is the resistor between the W1 and B1 terminals.

VIN

RDAC1

B1 R42

W1 B2

VOUT

OAVOUT

10nF

R41

1.7kΩ

R38

2.7kΩ

09579-006

Figure 6. Linear Inverting Amplifier

The inverting amplifier with pseudologarithmic gain is shown

in Figure 7, and the gain is defined in Equation 6.

AW1

WB1

G−=

(6)

where:

RWB1is the resistor between the W1 and B1 terminals.

RAW 1is the resistor between the A1 and W1 terminals.

RDAC1

B1A1 R42

W1 B2

OUT

OAVOUT

10nF

R41

1.7kΩ

R43

09579-007

Figure 7. Pseudologarithmic Inverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

Output Buffers

RDAC2 and RDAC3 can be connected to an output buffer as

shown Figure 8 and Figure 9.

09579-008

VOUT3

RDAC2

B2 BUF_3

Figure 8. RDAC2

09579-009

VOUT4

RDAC3

B3 BUF_4

Figure 9. RDAC3

UG-236 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The EVAL-AD5254SDZ evaluation kit includes evaluation

board software provided on a CD. The software is compatible

with Windows® XP, Windows Vista, and Windows 7 (both 32

and 64 bits).

Install the software before connecting the SDP board to the USB

port of the PC to ensure that the SDP board is recognized when

it is connected to the PC.

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

2. The installation software must open automatically. If it

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

3. After installation is completed, power up the evaluation

board as described in the Power Supplies section.

4. Plug the EVAL-AD5254SDZ into the SDP board and the SDP

board into the PC using the USB cable included in the box.

5. When the software detects the evaluation board, follow the

instructions that appear to finalize the installation.

To uninstall the program, click Start > Control Panel > Add or

Remove Programs > AD5254 Eval Board.

RUNNING THE SOFTWARE

To r un t he evaluation board software, do the following:

1. Click Start > All Programs > Analog Devices > AD5254

>AD5254 Eval Board.

2. If the SDP board is not connected to the USB port when

the software is launched, a connectivity error is displayed

(see Figure 10). Connect the evaluation board to the USB

port of the PC, wait a few seconds, click Rescan, and follow

the instructions.

09579-010

Figure 10. Pop-Up Window Error

The main window of the E VAL -AD5254SDZ evaluation

software then opens, as shown in Figure 11.

09579-011

Figure 11. EVAL-AD5254SDZ Evaluation Board Software Main Window

Evaluation Board User Guide UG-236

Rev. 0 | Page 7 of 16

SOFTWARE OPERATION

The main window of the E VA L -AD5254SDZ software is

divided into the following sections: QUICK COMMANDS,

features of the main window are as follows:

•The QUICK COMMANDSsection allows you to send the

AD5254 quick commands directly to the AD5254.

•The REGISTER ACCESS section can be used to update

the RDAC registers by typing a value into a window and

clicking WRITE. Alternatively, you can send a customized

I2C data word by manually switching the scroll bars from 0

to 1 or from 1 to 0, as desired, and then clicking SEND

DATA. When WRITE is clicked or a quick command is

executed, a write-read operation is performed, and the

values displayed in this section are updated with the actual

RDAC register values. This function can be used to verify

whether the write operation was completed successfully.

The scroll bars are updated upon each write transfer.

•The WP section enables or disables the AD5254 WP pin.

•The TOLERANCE section displays the stored tolerance of

each internal resistor.

•The MEMORY section displays the data stored in the

memory block. The data can be updated by switching the

scroll bar from READ to WRITE, updating a particular

window value, clicking UPDATE ALL or UPDATE

SINGLE, and selecting the memory location to write.

•Clicking EXIT closes the program but does not reset the part.

UG-236 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

09579-019

MULTICHANNEL

I2C

SPI

U/D

0x5E

0x58

0x5A

1AGND2

2B2

3A2

7A4

8W4

DGND

SHDN

SYNC

DIN

5AGND4

6B4

4W2

21 AGND1

19 A3

SDO

SCLK

RESET

VDD

17 AGND3

18 W3

24 B1

22 W1

23 A1

20 B3

U6 AD8403

1W1

2B1

3A1

7B2

8A2 9

SDA

VSS

11 A3

12 B3 5

6W2

AD0

19 W4

13 W3

SCL

DGND

AD1

17 A4

18 B4

VDD

U7 AD5254

GND

SHDN

DIN

SCLK

SDO

VSS

RESET

VDD

SYNC

21 B2

19 A2

13 B3

14 W3

15 A3

16 B1

17 W1

18 A1

24 B4

22 A4

23 W4

20 W2

U8 AD5204

GND

VDD

SCL

8A2

SDA

1B1

2A1

3W2

9B2

10 W1

AD5243

GND

VDD

SCLK

SYNC 7

DIN

1B1

2A1

3W2

9B2

10 W1

AD5162

GND

VDD

SCL

8A2

SDA

1B1

2A1

3W2

9B2

10 W1

AD5172_SOCKET

SCLK 3

DIN

7A1

8W1

9B1

10 A2

11 W2

12 B2

GND 6

VSS

SDO

VDD

13 B3

14 W3

15 A3

16 B4

17 W4

18 A4 20

RESET

SYNC

RDY

U4 AD5233

VSS

5W2

6A2

GND

7B2

1B1

2A1

3W1

MODE 10

DACSEL 11

U/D 12

CLK 13

VDD

AD5222

4W1

5B1

6A1

VSS

SDA

VDD

AD0

SCL

DGND

AD1

12 A3

13 B3

14 W3

AD5252

GND 5

VSS

6A1

8B1

7W1

SCLK 2

DIN 3

SDO

9B2

10 W2

11 A2

VDD

WP 14

RESET

SYNC

RDY

U10

AD5232

GND 5

VSS

6A1

8B1

7W1

SCLK 2

DIN 3

SDO

9B2

10 W2

11 A2

VDD

WP 14

RESET

SYNC

RDY

U11

AD5235

GND 5

VSS

6V1

8B1

7W1

SCLK 2

DIN 3

SDO

9B2

10 W2

11 V2

VDD

WP 14

RESET

SYNC

RDY

U12

ADN2850

W1-1

W2-1

W3-1

W4-1

SHDN

RESET

SCLK

SDO

DIN

SYNC-1

W1-8

W2-8

W3-8

W4-8

SDA

SCL

W1-5

W2-5

RDY

SDO

DIN

SCLK

SYNC-5

RESET

VDD

VSS

VDD

W1-4

W2-4

SYNC-4

DIN

SCLK

VDD

W1-2

W2-2

W3-2

W4-2

SYNC-2

SCLK

DIN

SDO

RESET

SHDN

VDD

VSS

W1-3

W2-3

W3-3

W4-3

RDY

SDO

SCLK

DIN

SYNC-3

RESET

VDD

VSS

W1-6

W2-6

RDY

SDO

DIN

SCLK

SYNC-6

RESET

VDD

VSS

W1-9

W2-9

W1-7

W2-7

RDY

SDO

DIN

SCLK

SYNC-7

RESET

VDD

VSS

VDD

SCL

SDA

VSS

VDD

W1-10

W2-10

SDA

SCL

W1-11

W2-11

SDA

SCL

VDD

W1-12

W2-12

CLK

U/D

DACSEL

MODE

VDD

VSS

Figure 12. Schematic of Multiboard Digital Potentiometers

Evaluation Board User Guide UG-236

Rev. 0 | Page 9 of 16

VDD

DAC + FLOATING DAC + BW

PSEUDOLOGATTENUATOR

AD8403-1

AD5204-1

AD5233-1

AD5162-1

AD5232-1

ADN2850-1

AD5235-1

AD5254-1

AD5252-1

AD5172

AD5243-1

AD5222-1

-1

3U14-A

AD8618ARZ

BUF-W1 W1_BUF

R34

R35

R39

R40

AC_INPUT C3

R36

A20

A21

U15-A

AD8652AR

6-7

U15-B

AD8652AR

V+

V-

U15-C

W1-1

W1-2

W1-3

W1-4

W1-5

W1-6

W1-7

W1-8

W1-9

W1-10

W1-11

W1-12

VDD

VSS

VDD

VSS

VDD

VSS

09579-020

AC + DC

Figure 13. Schematic of Multiboard RDAC0 Circuits

09579-021

INVERTINGANDNON-INVERTINGW

ITHLINEARANDPSEUDO-LOGGAIN

DIGIPOT

PSEUDOLOG

LINEAR

NON-INVERTING

INVERTING

NON-INVERTING

INVERTING

CIRCUIT CONNECTION

VIN

GND

5U14-B

AD8618ARZ

AD8403 -2

AD5204 -2

AD5233 -2

AD5162 -2

AD5232 -2

ADN2850 -2

AD5235 -2

AD5254 -2

AD5252 -2

AD5172 -2

AD5243 -2

AD5322 -2

VOUT

R38

J2-1

J2-2

R41

R42

R43

OAVOUT

A29

A27

A30

W2-1

W2-2

W2-3

W2-4

W2-5

W2-6

W2-7

W2-8

W2-9

W2-10

W2-11

W2-12

B2W2

Figure 14. Schematic of Multiboard RDAC1 Circuits

UG-236 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

09579-017

POWER-SUPPLIES

EXT VDD

+5V

+3.3V

GND

EXT VSS

GND

CHANNELS 3 AND 4 POWER-SUPPLY

DIGITAL PINS CURRENT MONITOR

C24

10uF C25

0.1uF

C26

0.1uF

C27

10uF

J1-1

J1-2

J1-3

A25

A24

-14

12 U14-D

AD8618ARZ

AD8403-4

AD5204-4

AD5233-4

AD5254-4

-8

10 U14-C

AD8618ARZ

AD8403-3

AD5204-3

AD5233-3

AD5254-3

BUF-4

BUF-3

VOUT4

VOUT3

0.1uF

VSS

VDD

+3.3V +5V

W4-1

W4-2

W4-3

W4-8

W3-1

W3-2

W3-3

W3-8

Figure 15. Schematic of AD5254 Power Supplies and Other Channels

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