REV. B

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use, nor for any infringements of patents or other rights of third parties that

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a

AD5241/AD5242

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

FUNCTIONAL BLOCK DIAGRAM

RDAC

REGISTER 1

ADDR

DECODE

8

PWR-ON

RESET

SERIAL INPUT REGISTER

AD5241

SHDN

SDA

SCL

GND

REGISTER 2

AD0

AD1

RDAC

REGISTER 1

ADDR

DECODE

8

PWR-ON

RESET

SERIAL INPUT REGISTER

AD5242

SHDN

SDA

SCL

GND

A

1

RDAC

REGISTER 2

REGISTER

1

AD0

AD1

FEATURES

256 Positions

10 k , 100 k , 1 M

Low Tempco 30 ppm/ C

Internal Power ON Midscale Preset

Single-Supply 2.7 V to 5.5 V or

Dual-Supply

2.7 V for AC or Bipolar Operation

Extra Programmable Logic Outputs

Self-Contained Shutdown Feature

Extended Temperature Range –40 C to +105 C

APPLICATIONS

Multimedia, Video, and Audio

Communications

Mechanical Potentiometer Replacement

Instrumentation: Gain, Offset Adjustment

Programmable Voltage-to-Current Conversion

Line Impedance Matching

GENERAL DESCRIPTION

The AD5241/AD5242 provide a single-/dual-channel, 256-

position, digitally controlled variable resistor (VR) device. These

devices perform the same electronic adjustment function as a

potentiometer, trimmer, or variable resistor. Each VR offers a

completely programmable value of resistance between the A

Terminal and the wiper, or the B Terminal and the wiper.

For AD5242, the fixed A-to-B terminal resistance of 10 k

Ω,

100 k

Ω, or 1 MΩ has a 1% channel-to-channel matching

tolerance. The nominal temperature coefficient of both parts is

30 ppm/

°C.

Wiper position programming defaults to midscale at system

power ON. Once powered, the VR wiper position is programmed

by an I

have available two extra programmable logic outputs that

enable users to drive digital loads, logic gates, LED drivers, and

analog switches in their system.

The AD5241/AD5242 are available in surface-mount (SOIC-14/-

16) packages and, for ultracompact solutions, TSSOP-14/-16

packages. All parts are guaranteed to operate over the

extended temperature range of –40

°C to +105°C. For 3-wire,

SPI compatible interface applications, please refer to AD5200,

AD5201, AD5203, AD5204, AD5206, AD5231

*, AD5232*,

AD5235

*, AD7376, AD8400, AD8402, and AD8403 products.

256-Position Digital Potentiometers

*Nonvolatile digital potentiometer

I