GENERAL DESCRIPTION
The ADN2850 provides dual-channel, digitally controlled programmable resistors2 with resolution of 1024 positions. These devices perform the same electronic adjustment function as a mechanical rheostat with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance. The ADN2850’s versatile programming via a standard serial interface allows 16 modes of operation and adjustment, including scratch pad programming, memory storing and retrieving, increment/decrement, log taper adjustment, wiper setting readback, and extra user defined EEMEM1.

FEATURES
   Dual, 1024-Position Resolution
   25 kΩ, 250 kΩ Full-Scale Resistance
   Low Temperature Coefficient: 35 ppm/°C
   Nonvolatile Memory1 Preset Maintains Wiper Settings
   Permanent Memory Write-Protection
   Wiper Settings Read Back
   Actual Tolerance Stored in EEMEM1
   Linear Increment/Decrement
   Log Taper Increment/Decrement
   SPI Compatible Serial Interface
   3 V to 5 V Single Supply or ±2.5 V Dual Supply
   26 Bytes User Nonvolatile Memory for Constant Storage
   Current Monitoring Configurable Function
   100-Year Typical Data Retention TA = 55°C

APPLICATIONS
   SONET, SDH, ATM, Gigabit Ethernet, DWDM Laser
      Diode Driver Optical Supervisory Systems