Description

The MAX5422/MAX5423/MAX5424 nonvolatile, lineartaper,digital potentiometers perform the function of amechanical potentiometer, but replace the mechanicswith a simple 3-wire SPI™-compatible digital interface.Each device performs the same function as a discretepotentiometer or variable resistor and has 256 tap points.The devices feature an internal, nonvolatile EEPROMused to store the wiper position for initialization duringpower-up. The 3-wire SPI-compatible serial interfaceallows communication at data rates up to 5MHz, minimizingboard space and reducing interconnection complexityin many applications.The MAX5422/MAX5423/MAX5424 provide three nominalresistance values: 50kΩ (MAX5422), 100kΩ(MAX5423), or 200kΩ (MAX5424). The nominal resistortemperature coefficient is 35ppm/°C end-to-end andonly 5ppm/°C ratiometric. This makes the devices idealfor applications requiring a low-temperature-coefficientvariable resistor, such as low-drift, programmable gainamplifiercircuit configurations.The MAX5422/MAX5423/MAX5424 are available in a3mm x 3mm 8-pin TDFN package, and are specifiedover the extended -40°C to +85°C temperature range.ApplicationsAudio Volume ControlLiquid-Crystal Display (LCD) Contrast ControlLow-Drift Programmable FiltersLow-Drift Programmable-Gain AmplifiersMechanical Potentiometer Replacements