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The AD5200 and AD5201 are programmable resistor devices,with 256 posiTIons and 33 posiTIons respecTIvely, that can be digitallycontrolled through a 3-wire SPI serial interface. The termsprogrammable resistor, variable resistor (VR), and RDAC arecommonly used interchangeably to refer to digital potenTIometers.These devices perform the same electronic adjustment functionas a potentiometer or variable resistor. Both AD5200/AD5201contain a single variable resistor in the compact μSOIC-10package. Each device contains a fixed wiper resistance at thewiper contact that taps the programmable resistance at a pointdetermined by a digital code. The code is loaded in the serialinput register. The resistance between the wiper and either endpoint of the programmable resistor varies linearly with respect tothe digital code transferred into the VR latch. Each variableresistor offers a completely programmable value of resistance,between the A terminal and the wiper, or the B terminal and thewiper. The fixed A-to-B terminal resistance of 10 kΩ or 50 kΩ
