AD5161 SPI Software (zip, 5.65 MB) The software can be operated in Windows 2000, NT, and XP. The AD5161 is a pin selectable interface(SPI/I2C), 256-position, single channel digital potentiometer often referred to as an RDAC. The AD5161 can be controlled digitally by a Micro-Controller, DSP, or Micro-Processor via a 3-wire/2-wire serial interface that allows multiple modes of operation and adjustment. The evaluation board simplifies control of the RDAC by PC software programming such requiring no programming skills or language.