Analog Devices EVAL-AD5162SDZ Manual de usuario

EVAL-AD5162SDZ User Guide

UG-348

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 AD5162 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 AD5162

Various test circuits

Various ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B)

PC software for control

PACKAGE CONTENTS

EVAL-AD5162SDZ 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 AD5162 data sheet

Electronic version of the UG-348 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5162,a dual-channel, 256-position digital potentiometer.

The AD5162 supports a single-supply 2.7 V to 5.5 V operation,

making the device suitable for battery-powered applications and

many other applications. In addition, the AD5162 uses a versa-

tile SPI-compatible serial interface, allowing speeds of up

to 25 MHz.

The EVAL-AD5162SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5162 part can be found in

the AD5162 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 DEMONSTRATION PLATFORM

Figure 1.

EVAL-AD5162SDZ

SYSTEM DEMONSTRATION

PLATFORM

10366-001

UG-348 EVAL-AD5162SDZ 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

Demonstration 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

Related Links............................................................................... 15

REVISION HISTORY

12/11—Revision 0: Initial Version

EVAL-AD5162SDZ User Guide UG-348

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVA L-AD5162SDZ supports using single power supplies.

The evaluation board can be powered either from the SDP-B

port or externally by the J1-1 and J1-2 connectors, as described

in Table 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 Analog positive power supply, VDD.

VDD For single-supply operation, it is 2.7 V

to 5 V.

J1-2 GND Analog ground.

LINK OPTIONS

Several link and switch options are incorporated in the

evaluation board and should be set up before using the board.

Tabl e 2 describes the positions of the links to control the

evaluation board by a PC, via the SDP-B board, using the EVA L -

AD5162SDZ in single-supply mode. The functions of these link

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

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

Link No. Option

A25 +3.3V

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:

+5V (from SDP-B).

+3.3V (from SDP-B).

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

A24 VSS This link should be connected to GND (analog ground).

UG-348 EVAL-AD5162SDZ User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The EVA L-AD5162SDZ incorporates several test circuits to

evaluate the AD5162 performance.

DAC

RDAC1 can be operated as a digital-to-analog converter (DAC),

as shown in Figure 2.

Figure 2. DAC

Tabl e 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Terminal Link Options Description

A1 A20 AC + DC Connects Terminal A1 to

(VDD − VSS)/2.

VDD Connects Terminal A1 to VDD.

W1 BUF_W1 Connects Terminal W1 to an

output buffer.

B1 A21 DC Connects Terminal B1 to

(VDD − VSS)/2.

GND Connects Terminal B1 to

analog ground.

The output voltage is defined in Equation 1.

256

)( WB1

OUT

VVV ×−=

(1)

where:

RWB1 is the resistor between the W1 and B1 terminals.

VA1 is the voltage applied to the A1 terminal (A20 link).

VB1 is the voltage applied to the B1 terminal (A21 link).

However, by using the R34 and R35 external resistors, the user

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

RDAC1 can be used to attenuate an ac signal, which must be

provided externally using the AC_INPUT connector, as shown

in Figure 3.

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 Tabl e 5.

Table 5. AC Signal Attenuation Link Options

Link Options Conditions

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/2.1

AC All other conditions.

A21 DC Use in conjunction with ac + dc link.

GND All other conditions.

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

The signal attenuation is defined in Equation 2.











+

×=

−− ENDTOEND

WWB1

nAttenuatio log20)dB(

(2)

where:

RWB1is the resistor between the W1 and B1 terminals.

RWis the wiper resistance.

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

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.

W1_BUF

RDAC1

AC + DC

VDD

B1 BUF_W1

GND

VDD – VSS

VDD

VDD – VSS

R34

R35

10366-002

W1_BUF

RDAC1

AC + DC

AC_INPUT

B1 BUF_W1

GND

– V

R34

R35

1µF

R36

– V

10366-003

EVAL-AD5162SDZ User Guide UG-348

Rev. 0 | Page 5 of 16

Signal Amplifier

RDAC2 can be operated as an inverting or noninverting signal

amplifier supporting linear or pseudologarithmic gains. Tabl e 6

shows the available configurations.

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

and the gain is defined in Equation 3.

R38

GWB2

+=1

(3)

where RWB2 is the resistor between the W2 and B2 terminals.

Figure 4. Linear Noninverting Amplifier

R42 can be used to set the maximum and minimum gain limits.

The inverting amplifier with linear gain is shown in Figure 5,

and the gain is defined in Equation 4.

Note that the input signal, VIN, must be negative.

R38

WB2

−=

(4)

where RWB2 is the resistor between the W2 and B2 terminals.

Figure 5. Linear Inverting Amplifier

Table 6. Amplifier Selection Link Options

Amplifier Gain Link Label VIN Range

Noninverting

Linear

A27

LINEAR

0 V to V

A29 NON-INV

A30 NON-INV

Inverting

Linear

A27

LINEAR

−V

to 0 V

A29 INV

A30 INV

VIN

RDAC2

B2 R42

W2 B2

VOUT

OAVOUT

10nF

R41

1.7kΩ

R38

2.7kΩ

10366-004

VIN

RDAC2

B2 R42

W2 B2

VOUT

OAVOUT

10nF

R41

1.7kΩ

R38

2.7kΩ

10366-006

UG-348 EVAL-AD5162SDZ User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The EVA L-AD5162SDZ evaluation kit includes evaluation

board software provided on a CD. The software is compatible

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

32 bits and 64 bits).

Install the software before connecting the SDP-B board to the USB

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

when it is connected to the PC.

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

2. The installation software opens 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. Connect the E VA L -AD5162SDZ to the SDP-B board and the

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

evaluation kit.

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 > AD5162 Eval Board.

RUNNING THE SOFTWARE

To run the program, do the following:

1. Click Start > All Programs > Analog Devices > AD5162 >

AD5162 Eval Board.

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

the software is launched, a connectivity error displays (see

Figure 6). Simply connect the evaluation board to the USB

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

the instructions.

Figure 6. Pop-Up Window Error

The main window of the E VAL -AD5162SDZ evaluation

software then opens, as shown in Figure 7.

Figure 7. EVAL-AD5162SDZ Evaluation Board Software Main Window

10366-009

10366-010

EVAL-AD5162SDZ User Guide UG-348

Rev. 0 | Page 7 of 16

SOFTWARE OPERATION

The main window of the E VA L -AD5162SDZ software is

divided into the following sections: RDAC1, RDAC2, and

RDAC1 and RDAC2 can be used to update the RDAC registers

by entering a desirable value into the text box and clicking

WRITE.

•SEND DATA is a customized I2C data-word that can be

sent by manually switching the scroll bars from 0 to 1 or

from 1 to 0, as desired, and then clicking SEND DATA.

In addition, the scroll bars are updated on each write

transfer, showing the command sent to the part.

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

UG-348 EVAL-AD5162SDZ User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 8. Schematic of Multiboard Digital Potentiometers

10366-011

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

EVAL-AD5162SDZ User Guide UG-348

Rev. 0 | Page 9 of 16

Figure 9. Schematic of Multiboard RDAC1 Circuits

Figure 10. Schematic of Multiboard RDAC2 Circuits

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

10366-012

AC + DC

10366-013

INVERTINGANDNON-INVERTINGWITHLINEARANDPSEUDO-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

UG-348 EVAL-AD5162SDZ User Guide

Rev. 0 | Page 10 of 16

Figure 11. Schematic of AD5162 Power Supplies and Other Channels

10366-014

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

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