GENERAL DESCRIPTION
The AD5255 provides dual 512-position and a single 128-position digitally controlled variable resistors1 (VR) in a TSSOP 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
    Mechanical potentiometer replacement
    RGB LED backlight control
    White LED brightness adjustment
    Programmable gain and offset control
    Programmable filters