DS1667

Two digitally controlled 256-positionpotentiometers 
Serial port provides means for setting andreading both potentiometers 
Resistors can be connected in series toprovide additional resolution 
Default wiper position on power up is 50% 
Resistive elements are temperature-compensated to +20% end to end 
Two high-gain, wide bandwidth operationalamplifiers 
Low power CMOS design 
Applications include analog-to-digital anddigital-to-analog converters, variableoscillators, and variable gain amplifiers 
20-pin DIP package or optional 20-pin SOICsurface mount package 
Operating temperature range- Commercial: to 70 
Resistance values:

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 eachpotentiometer are tap points accessible to the wiper. The position of the wiper on the resistive array is setby an 8-bit register that controls which tap point is connected to the wiper output. Each 8-bit register canbe read or written by sending or receiving data bits over a 3-wire serial port. In addition, the resistors canbe stacked such that a single potentiometer of 512 sections results. When two separate potentiometers areused, the resolution of the DS1667 is equal to the resistance value divided by 256. When thepotentiometers are stacked end to end, the resistance value is doubled while the resolution remains thesame. The DS1667 also contains two high gain wide bandwidth operational amplifiers. Each amplifierhas both the inverting and non-inverting inputs and the output available for user configuration. The operational amplifiers can be paired with the resistive elements to perform such functions as analog todigital conversion, digital to analog conversion, variable gain amplifiers, and variable oscillators.