The AD5203 provides a quad channel, 64-position digitally controlled 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 contactthat taps the fixed resistor value at a point determined by a digitalcode loaded into the controlling serial input register. Theresistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferredinto the VR latch. Each variable resistor offers a completely programmable value of resistance, between the A terminal andthe wiper or the B terminal and the wiper. The fixed A-to-Bterminal resistance of 10 kW, or 100 kW has a ±1% channel-tochannel matching tolerance with a nominal temperature coefficientof 700 ppm/°C.
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