GENERAL DESCRIPTION
The ADN2860 provides dual 512-position and single 128-position, digitally controlled variable resistors1 (VR) in a single 4 mm × 4 mm LFCSP package. This device performs the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR offers a completely programmable value of resistance between the A terminal and the wiper, or the B terminal and the wiper. The fixed A-to-B terminal resistance of 25 kΩ or 250 kΩ has a 1% channel-to-channel matching tolerance and a nominal temperature coefficient of 35 ppm/°C.

FEATURES
   3 channels
      Dual 512-position
      Single 128-position
   25 kΩ or 250 kΩ full-scale resistance
   Low temperature coefficient
      Potentiometer divider 15 ppm/°C
      Rheostat mode 35 ppm/°C
   Nonvolatile memory retains wiper settings
   Permanent memory write protection
   Linear increment/decrement
   ±6 dB increment/decrement
   I2C-compatible serial interface
   2.7 V to 5.5 V single-supply operation
   ±2.25 V to ±2.75 V dual-supply operation
   Power-on reset time
   256 bytes general-purpose user EEPROM
   11 bytes RDAC user EEPROM
   GBIC and SFP compliant EEPROM
   100-year typical data retention at TA = 55°C

APPLICATIONS
   Laser diode drivers
   Optical amplifiers
   TIA gain setting
   TEC controller temperature setpoint