10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers

The MAX5494–MAX5499 10-bit (1024-tap), dual, nonvolatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a 3-wire SPI™-compatible serial interface. The MAX5494/MAX5495 are dual, 3-terminal, programmable voltage-dividers; the MAX5496/MAX5497 are dual, 2-terminal variable resistors; and the MAX5498/MAX5499 include one 2-terminal variable resistor and one 3-terminal programmable voltage-divider.

The MAX5494–MAX5499 feature an internal, nonvolatile, electrically erasable programmable read-only memory (EEPROM) that stores the wiper position for initialization during power-up. The 3-wire SPI-compatible serial interface allows communication at data rates up to 7MHz.

The MAX5494–MAX5499 are ideal for applications requiring digitally controlled potentiometers. End-to-end resistance values of 10kΩ and 50kΩ are available with a 35ppm/°C end-to-end temperature coefficient. The ratiometric temperature coefficient is 5ppm/°C for each channel, making these devices ideal for applications requiring low-temperature-coefficient programmable voltage-dividers such as low-drift, programmable-gain amplifiers.

The MAX5494–MAX5499 operate with either a single power supply (+2.7V to +5.25V) or dual power supplies (±2.5V). The devices consume 400µA (max) of supply current when writing data to the nonvolatile memory and 1.5µA (max) of standby supply current. The devices are available in space-saving (5mm x 5mm x 0.8mm), 16-pin TQFN package and are specified over the extended (-40°C to +85°C) temperature range.

Applications

* Gain and Offset Adjustment * LCD Contrast Adjustment * Low-Drift Programmable-Gain Amplifiers * Mechanical Potentiometer Replacement * Pressure Sensors * Volume Control

* Wiper Position Stored in Nonvolatile Memory and Recalled Upon Power-Up

* 16-Pin, 5mm x 5mm x 0.8mm TQFN Package

* 35ppm/°C End-to-End Resistance Temperature Coefficient

* 5ppm/°C Ratiometric Temperature Coefficient

* 10kΩ and 50kΩ End-to-End Resistor Values

* 3-Wire SPI-Compatible Serial Interface

* Reliability (TA = +85°C)

* 50,000 Wiper Store Cycles

* 50 Years Wiper Data Retention

* 1.5µA (max) Standby Current

* Single +2.7V to +5.25V Supply Operation

* Dual ±2.5V Supply Operation