AD5203

a FEATURES 64 Position Replaces Four Potentiometers 10 k⍀ , 100 k ⍀ Power Shutdown—Less than 5 ␮ A 3-Wire SPI-Compatible Serial Data Input 10 MHz Update Data Loading Rate +2.7 V to +5.5 V Single Supply Operation Midscale Preset APPLICATIONS Mechanical Potentiometer Replacement Programmable Filters, Delays, Time Constants Volume Control, Panning Line Impedance Matching Power Supply Adjustment SDI VDD DGND 4-Channel, 64-Position Digital Potentiometer AD5203 FUNCTIONAL BLOCK DIAGRAM DAC 1 AD5203 6-BIT LATCH 6 CK RS 1 SHDN A1 W1 B1 AGND1 DAC 2 SELECT 3 4 A1, A0 2 8-BIT SERIAL LATCH D CK Q RS DAC 2 6-BIT 6 LATCH CK RS SHDN A2 W2 B2 AGND2 DAC 3 6 6-BIT LATCH 6 CK RS SHDN A3 W3 B3 AGND3 GENERAL DESCRIPTION CLK CS 6-BIT LATCH CK RS 6 The AD5203 provides a quad channel, 64-position digitallycontrolled variable resistor (VR) device. These parts perform the same electronic adjustment function as a potentiometer or variable resistor. The AD5203 contains four independent variable resistors in a 24-lead SOIC and the compact TSSOP-24 packages. Each part 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 controlling 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. Each variable resistor offers a completely programmable value of resistance, between the A terminal and the...