Single/Dual, +15 V/±5 V, 256-Position,

AD5280/AD5282

Rev. C

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FEATURES

AD5280: 1 channel

AD5282: 2 channels

256 positions

+10 V to +15 V single supply; ±5.5 V dual-supply operation

Fixed terminal resistance: 20 kΩ, 50 kΩ, 200 kΩ

Low temperature coefficient: 30 ppm/°C

Power-on midscale preset1

Programmable reset

APPLICATIONS

Multimedia, video, and audio

Communications

Mechanical potentiometer replacement

Instrumentation: gain, offset adjustment

Programmable voltage source

Programmable current source

Line impedance matching

GENERAL DESCRIPTION

The AD5280/AD5282 are single-channel and dual-channel,

256-position, digitally controlled variable resistors (VRs)2.

The 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 kΩ, 50 kΩ, or 200 kΩ has

a 1% channel-to-channel matching tolerance. The nominal

temperature coefficient of both parts is 30 parts per million/

degrees centigrade (ppm/°C). Another key feature is that the

parts can operate up to +15 V or ±5 V.

Wiper position programming defaults to midscale at system

power-on. When powered, the VR wiper position is programmed

AD5282 feature sleep mode programmability. This allows any

level of preset in power-up and is an alternative to a costly

EEPROM solution. Both parts have additional programmable

logic outputs that enable users to drive digital loads, logic gates,

LED drivers, and analog switches in their system.

the shutdown to achieve the desired preset level.

The AD5280/AD5282 are available in thin, surface-mounted

14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to

operate over the extended industrial temperature range of

−40°C to +85°C. For 3-wire SPI-compatible interface applica-

tions, see the AD5260/AD5262 product information on

FUNCTIONAL BLOCK DIAGRAMS

A

WB

RDAC REGISTER

OUTPUT REGISTER

SERIAL INPUT REGISTER

AD5280

SHDN

SDA

SCL

GND

AD0

AD1

ADDRESS

CODE

PWR ON

RESET

8

Figure 1. AD5280

RDAC1 REGISTER

RDAC2 REGISTER

OUTPUT

REGISTER

SERIAL INPUT REGISTER

AD5282

SHDN

SDA

SCL

GND

AD0

AD1

ADDRESS

CODE

PWR ON

RESET

8

Figure 2. AD5282