DESCRIPTION

The DS1667 is a dual-solid state potentiometer that is adjustable by digitally selected resistive elements. Each potentiometer is composed of 256 resistive elements. Between each resistive section of each potentiometer are tap points accessible to the wiper. The position of the wiper on the resistive array is set by an 8-bit register that controls which tap point is connected to the wiper output. Each 8-bit register can be read or written by sending or receiving data bits over a 3-wire serial port. In addition, the resistors can be stacked such that a single potentiometer of 512 sections results.

FEATURES

■ Two digitally controlled 256-position potentiometers

■ Serial port provides means for setting and reading both potentiometers

■ Resistors can be connected in series to provide additional resolution

■ Default wiper position on power up is 50

■ Resistive elements are temperaturecompensated to +20 end to end

■ Two high-gain, wide bandwidth operational amplifiers

■ Low power CMOS design

■ Applications include analog-to-digital and digital-to-analog converters, variable oscillators, and variable gain amplifiers

■ 20-pin DIP package or optional 20-pin SOIC surface mount package

■ Operating temperature range - Commercial: 0°C to 70°C

■ Resistance values: