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