GENERAL DESCRIPTION

The AD5204/AD5206 provide 4-/6-channel, 256-position digitally controlled variable resistor (VR) devices. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. Each channel of the AD5204/AD5206 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the SPI-compatible serial-input register. The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the VR latch. The variable resistor 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 10 kΩ, 50 kΩ, or 100 kΩ has a nominal temperature coefficient of 700 ppm/°C.

FEATURES

256 positions

Multiple independently programmable channels

AD5204—4-channel

AD5206—6-channel

Potentiometer replacement

Terminal resistance of 10 kΩ, 50 kΩ, 100 kΩ

3-wire SPI-compatible serial data input

+2.7 V to +5.5 V single-supply operation; ±2.7 V dual-supply operation

Power-on midscale preset

APPLICATIONS

Mechanical potentiometer replacement

Instrumentation: gain, offset adjustment

Programmable voltage-to-current conversion

Programmable filters, delays, time constants

Line impedance matching