AD5282 Analog Devices Data Handbook/Manual

Single/Dual, +15 V/±5 V, 256-Position, I2C-Compatible Digital Potentiometer

AD5280/AD5282

FEATURES logic outputs that enable users to drive digital loads, logic gates, LED drivers, and analog switches in their system.

AD5280: 1 channel

AD5282: 2 channels The AD5280/AD5282 are available in thin, surface-mounted 256 positions 14-lead TSSOP and 16-lead TSSOP. All parts are guaranteed to

5 V to 15 V single supply; ±5.5 V dual-supply operation operate over the extended industrial temperature range of Fixed terminal resistance: 20 kΩ, 50 kΩ, 200 kΩ −40°C to +85°C. For 3-wire SPI-compatible interface applica- Low temperature coefficient: 30 ppm/°C tions, see the AD5260/AD5262 product information on Power-on midscale preset1 www.analog.com. Programmable reset

FUNCTIONAL BLOCK DIAGRAMS

Operating temperature: −40o C to +85o C

I2C-compatible interface

APPLICATIONS

Multimedia, video, and audio VDD

Communications VL

VSS RDAC REGISTER OUTPUT REGISTER

Mechanical potentiometer replacement Instrumentation: gain, offset adjustment

ADDRESS

Programmable voltage source CODE PWR ON RESET

Programmable current source

Line impedance matching

SERIAL INPUT REGISTER

GENERAL DESCRIPTION GND

AD5280

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

www.BDTIC.com/ADI AD0 AD1 256-position, digitally controlled variable resistors (VRs)2.

Figure 1. AD5280

The devices perform the same electronic adjustment function

as a potentiometer, trimmer, or variable resistor. Each VR offers A1 W1 B1 A2 W2 B2 O1

a completely programmable value of resistance between the

OUTPUT

A terminal and the wiper or the B terminal and the wiper. The

SHDN REGISTER

fixed A-to-B terminal resistance of 20 kΩ, 50 kΩ, or 200 kΩ has

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

RDAC1 REGISTER RDAC2 REGISTER

temperature coefficient of both parts is 30 parts per million/ degrees centigrade (ppm/°C). Another key feature is that the

ADDRESS

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

RESET

Wiper position programming defaults to midscale at system

SCL 9-

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

by an I2C-compatible, 2-wire serial data interface. The AD5280/

AD5282 feature sleep mode programmability. This allows any AD5282

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

AD0 AD1

EEPROM solution. Both parts have additional programmable

Figure 2. AD5282

1 Assert shutdown and program the device during power-up, then deassert

the shutdown to achieve the desired preset level. 2 The terms digital potentiometer, VR, and RDAC are used interchangeably.

Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

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rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.