ADN2860
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ADN2860

3-Channel, Dual 512- and Single 128-Position I²C Digital Potentiometer with Nonvolatile Memory and I²C Interface

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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.

Wiper position programming, EEPROM2 reading, and EEPROM writing are conducted via the standard 2-wire I2C 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 × 4 mm, 24-lead LFCSP package. All parts are guaranteed to operate over the extended industrial tempera-ture range −40°C to +85°C.

1 The terms programmable resistor, variable resistor, RDAC, and digital potentiometer are used interchangeably.
2 The terms nonvolatile memory, EEMEM, and EEPROM are used interchangeably.

Applications

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

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