PRELIMINARY TECHNICAL DATA

a

Digital Potentiometers

Preliminary Technical Data

AD5280/AD5282

REV PrE 12 MAR 02

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©Analog Devices, Inc., 2002

FEATURES

256 Position

AD5280 – 1-Channel

AD5282 – 2-Channel (Independently Programmable)

Potentiometer Replacement

20K, 50K, 200K Ohm with TC < 50ppm/ºC

Internal Power ON Mid-Scale Preset

+5 to +15V Single-Supply; ±5.5V Dual-Supply Operation

I

APPLICATIONS

Multi-Media, Video & Audio

Communications

Mechanical Potentiometer Replacement

Instrumentation: Gain, Offset Adjustment

Programmable Voltage to Current Conversion

Line Impedance Matching

GENERAL DESCRIPTION

The AD5280/AD5282 provides 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. The fixed

A-to-B terminal resistance of 20, 50 or 200K ohms has a 1%

channel-to-channel matching tolerance with a nominal temperature

coefficient of 30 ppm/°C.

Wiper Position programming defaults to midscale at system power

ON. Once powered the VR wiper position is programmed by a I

compatible 2-wire serial data interface. Both parts have two

programmable logic outputs available to drive digital loads, gates,

LED drivers, analog switches, etc.

FUNCTIONAL BLOCK DIAGRAMS

RDAC1 REGISTER

ADDRESS

DECODE

SERIAL INPUT REGISTER

PWR ON

RESET

SDA

SCL

V

SS

V

DD

GND

A

1

W

1

B

1

AD5280

8

SHDN

RDAC2 REGISTER

O

1

RR

V

L

AD0

AD1

O

2

RDAC1 REGISTER

ADDRESS

DECODE

SERIAL INPUT REGISTER

PWR ON

RESET

SDA

SCL

V

SS

V

DD

GND

A

1

W

1

B

1

AD5282

8

SHDN

RDAC2 REGISTER

A

2

W

2

B

2

RR

V

L

AD0

AD1

OUTPUT

REGISTER

O

1

R

The AD5280/AD5282 are available in ultra compact surface mount

thin TSSOP-14/-16 packages. All parts are guaranteed to operate

over the extended industrial temperature range of -40°C to +85°C.

For 3-wire, SPI compatible interface applications, see

AD5203/AD5204/AD5206/AD7376/AD8400/AD8402/AD8403/

AD5260/AD5262/AD5200/AD5201 products.

ORDERING GUIDE

Kilo

Package

Package

Model

Ohms

Temp

Description

Option

AD5280BRU20

20

-40/+85°C

TSSOP-14

RU-14

AD5280BRU50

50

-40/+85°C

TSSOP-14

RU-14

AD5280BRU200

200

-40/+85°C

TSSOP-14

RU-14

AD5282BRU20

20

-40/+85°C

TSSOP-16

RU-16

AD5282BRU50

50

-40/+85°C

TSSOP-16

RU-16

AD5282BRU200

200

-40/+85°C

TSSOP-16

RU-16

The AD5280/AD5282 die size is 75 mil X 120 mil, 9,000 sq. mil.

Contains xxx transistors. Patent Number xxx applies.