AD5207

a FEATURES 256-Position, 2-Channel Potentiometer Replacement 10 k⍀, 50 k⍀, 100 k⍀ Power Shut-Down, Less than 5 ␮A 2.7 V to 5.5 V Single Supply ؎2.7 V Dual Supply 3-Wire SPI-Compatible Serial Data Input Midscale Preset During Power-On APPLICATIONS Mechanical Potentiometer Replacement Stereo Channel Audio Level Control Instrumentation: Gain, Offset Adjustment Programmable Voltage-to-Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Automotive Electronics Adjustment 2-Channel, 256-Position Digital Potentiometer AD5207 FUNCTIONAL BLOCK DIAGRAM A1 W1 B1 A2 W2 B2 SHDN VDD VSS CS CLK SDI DGND RDAC1 REGISTER R RDAC2 REGISTER R LOGIC AD5207 POWERON RESET 8 SERIAL INPUT REGISTER SDO GENERAL DESCRIPTION The AD5207 provides dual channel, 256-position, digitally controlled variable resistor (VR) devices that perform the same electronic adjustment function as a potentiometer or variable resistor. Each channel of the AD5207 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 end point 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,...