Analog Devices Inc. AD5241BR1M

Description
The AD5241/AD5242 are I²C-compatible, 256-position digital potentiometers that provide a single- or dual-channel, digitally controlled variable resistor (VR) device. They 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 the AD5242, the fixed A-to-B terminal resistance of 10 kΩ, 100 kΩ, 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. When powered, the VR wiper position is programmed by an PC-compatible, 2-wire serial data interface. Both parts have two extra programmable logic outputs available that enable users to drive digital loads, logic gates, LED drivers, and analog switches in their system.

Features
256 positions
10 kΩ, 100 kΩ, 1 MΩ
Low temperature coefficient: 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
PC-compatible interface with readback capability
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