Dual, 256-tap, Nonvolatile, I2c-interface, Digital Potentiometers

The MAX5477 MAX5478 MAX5479 nonvolatile, dual, linear-taper, Digital Potentiometers perform the function of a mechanical potentiometer, but replace the mechanics with a simple 2-wire digital Interface Each device performs the same function as a Discrete poten- tiometer or variable resistor and has 256 tap points. The devices feature an internal, nonvolatile EEPROM used to store the wiper position for initialization during power-up. A write-protect feature prevents accidental overwrites of the EEPROM The fast-mode I2C-compati- ble serial Interface allows Communication at data rates up to 400kbps, minimizing board space and reducing interconnection complexity in many applications. Three address inputs allow a total of eight unique address combinations. The MAX5477 MAX5478 MAX5479 provide three nomi- nal resistance values: 10k MAX5477 , 50k MAX5478 , or 100k MAX5479 . The nominal resistor temperature coefficient is 35ppm/C end-to-end and 5ppm/C ratiometric. The low temperature coefficient makes the devices ideal for applications requiring a low- temperature-coefficient variable resistor, such as low- drift, programmable gain-amplifier circuit configurations. The MAX5477 MAX5478 MAX5479 are available in 16- pin 3mm x 3mm x 0.8mm thin QFN and 14-pin 4.4mm x 5mm TSSOP packages. These devices operate over the extended -40C to +85C temperature range. By Maxim Integrated Products