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