Analog Devices Inc. ADN2860ACPZ25-RL7

Description
The ADN2860 is a 3-channel digital potentiometer with nonvolatile memory. It provides dual 512-position and single 128-position digitally controlled variable resistors in a single 4 mm x 4 mm LFCSP package. The 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.
Wiper position programming, EEPROM reading, and EEPROM writing are conducted via the standard 2-wire IC interface. Previous default wiper position settings can be stored in memory and refreshed upon system power-up.
Additional features of the ADN2860 include preprogrammed linear and logarithmic increment/decrement wiper changing. The actual resistor tolerances are stored in EEPROM so that the actual end-to-end resistance is known, which is valuable for calibration in precision applications.
The ADN2860 EEPROM, channel resolution, and package size conform to GBIC and SFP specifications. The ADN2860 is available in a 4 mm x 4 mm, 24-lead LFCSP package. All parts are guaranteed to operate over the extended industrial temperature range -40°C to 85°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
Voo, VOD, OND, SCL, SDA, PC, ADOC, AD1, AD0, EEA1, EECI, C
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 T₁ = 55°C

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