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 wiper or the B terminal and the wiper. The fixed A-to-B
terminal resistance of 10 kW, or 100 kW has a ±1% channel-tochannel
matching tolerance with a nominal temperature coefficient
of 700 ppm/°C.