GENERAL DESCRIPTION
The AD5235-EP is a dual-channel, nonvolatile memory,1 digitally controlled potentiometer2 with 1024-step resolution. 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 AD5235-EP’s versatile programming 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 user-defined information such as memory data for other components, look-up tables, or system identification information.

FEATURES
   Dual-channel, 1024-position resolution
   25 kΩ nominal resistance
   Low temperature coefficient: 35 ppm/°C
   Nonvolatile memory stores wiper settings
   Permanent memory write protection
   Wiper setting readback
   Resistance tolerance stored in EEMEM
   Predefined linear increment/decrement instructions
   Predefined ±6 dB/step log taper increment/decrement
      instructions
   SPI-compatible serial interface
   +2.7 V to +5 V single supply or ±2.5 V dual supply
   26 bytes extra nonvolatile memory for user-defined
      information
   100-year typical data retention, TA = 55°C
   Power-on refreshed with EEMEM settings
   Enhanced Features
      Supports defense and aerospace applications (AQEC)
      Temperature range: −40°C to +125°C
      Controlled manufacturing baseline
      1 assembly/test site
      1 fabrication site
      Product change notification
      Qualification data available on request

APPLICATIONS
   DWDM laser diode driver, optical supervisory systems
   Mechanical potentiometer replacement
   Instrumentation: gain, offset adjustment
   Programmable voltage-to-current conversion
   Programmable filters, delays, time constants
   Programmable power supply
   Low resolution DAC replacement
   Sensor calibration