The AD5233 is a quad-channel nonvolatile memory，1 digitally controlled potentiometer2 with a 64-step resolution. The device performs the same electronic adjustment function as a mechanical potentiometer with enhanced resolution， solid-state reliability， and remote controllability. The AD5233 has versatile programming using a serial peripheral interface （SPI） for 16 modes of operation and adjustment， including scratchpad programming， memory storing and restoring， increment/decrement， ±6 dB/step log taper adjustment， wiper setting readback， and extra EEMEM for user-defined information such as memory data for other components， look-up tables， or system identification information. In the scratchpad programming mode， a specific setting can be programmed directly to the RDAC register， which sets the resistance between Terminal W to Terminal A and Terminal W to Terminal B. This setting can be stored into the EEMEM and is transferred automatically to the RDAC register during system power-on. The EEMEM content can be restored dynamically or through external PR strobing. A WP function protects EEMEM contents. To simplify the programming， independent or simultaneous increment or decrement commands can be used to move the RDAC wiper up or down， one step at a time. For logarithmic ±6 dB step changes in wiper settings， the left or right bit shift command can be used to double or halve the RDAC wiper setting. The AD5233 is available in a thin 24-lead TSSOP package. The part is guaranteed to operate over the extended industrial temperature range of ?40°C to +85°C.