GENERAL DESCRIPTION
The ADN2850 is a dual-channel, nonvolatile memory1, digitally controlled resistors2 with 1024-step resolution, offering guaranteed maximum low resistor tolerance error of ±8%. The device performs the same electronic adjustment function as a mechanical rheostat with enhanced resolution, solid state reliability, and superior low temperature coefficient performance. The versatile programming of the ADN2850 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 table, or system identification information.

FEATURES
   Dual-channel, 1024-position resolution
   25 kΩ, 250 kΩ nominal resistance
   Maximum ±8% nominal resistor tolerance error
   Low temperature coefficient: 35 ppm/°C
   2.7 V to 5 V single supply or ±2.5 V dual supply
   Current monitoring configurable function
   SPI-compatible serial interface
   Nonvolatile memory stores wiper settings
   Power-on refreshed with EEMEM settings
   Permanent memory write protection
   Resistance tolerance stored in EEMEM
   26 bytes extra nonvolatile memory for user-defined
      information
   1M programming cycles
   100-year typical data retention

APPLICATIONS
   SONET, SDH, ATM, Gigabit Ethernet, DWDM laser diode
      driver, optical supervisory systems
   Mechanical rheostat replacement
   Instrumentation gain adjustment
   Programmable filters, delays, time constants
   Sensor calibration