PDTC114EM

a FEATURES AD5200—256-Position AD5201—33-Position 10 k ⍀, 50 k⍀ 3-Wire SPI-Compatible Serial Data Input Single Supply 2.7 V to 5.5 V or Dual Supply ؎ 2.7 V for AC or Bipolar Operations Internal 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 256-Position and 33-Position Digital Potentiometers AD5200/AD5201 FUNCTIONAL BLOCK DIAGRAM AD5200/AD5201 VDD VSS A CS CLK SDI GND PWR-ON PRESET SER REG Dx W B 8/6 RDAC REG SHDN GENERAL DESCRIPTION The AD5200 and AD5201 are programmable resistor devices, with 256 positions and 33 positions respectively, that can be digitally controlled through a 3-wire SPI serial interface. The terms programmable resistor, variable resistor (VR), and RDAC are commonly used interchangeably to refer to digital potentiometers. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. Both AD5200/AD5201 contain a single variable resistor in the compact MSOP package. Each device contains a fixed wiper resistance at the wiper contact that taps the programmable resistance at a point determined by a digital code. The code is loaded in the serial input register. The resistance between the wiper and either end point of the programmable resistor varies linearly with respect to the digital code transferred into the VR latch. Each variable resis...