The AD5235 is a dual-channel， nonvolatile memory，1 digitally controlled potentiometer2 with 1024-step resolution， offering guaranteed maximum low resistor tolerance error of ±8%. The device performs the same electronic adjustment function as a mechanical potentiometer with enhanced resolution， solid state reliability， and superior low temperature coefficient performance. The versatile programming of the AD5235 via an SPI?-compatible serial interface allows 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 EEMEM1 for userdefined information such as memory data for other components， look-up table， or system identification information.In the scratchpad programming mode， a specific setting can be programmed directly to the RDAC2 register， which sets the resistance between Terminal W and Terminal A and Terminal W and Terminal B. This setting can be stored into the EEMEM and is restored automatically to the RDAC register during system power-on.