MAX5422ETA+

Overview

The MAX5422ETA+ is a single-channel, nonvolatile digital potentiometer featuring 256 tap positions and a nominal end-to-end resistance of 50kΩ. It operates on a single supply voltage ranging from +2.7V to +5.25V with a typical standby current of 500nA. The device utilizes a 3-wire SPI-compatible serial interface for communication at data rates up to 5MHz. Key electrical characteristics include ±0.5 LSB DNL and INL in voltage-divider mode, an end-to-end temperature coefficient of 35ppm/°C, and a ratiometric temperature coefficient of 5ppm/°C. The wiper resistance is typically 325Ω.

Feature Summary

• Nonvolatile EEPROM stores wiper position for recall upon power-up or interface command
• Single-supply operation (+2.7V to +5.25V) with 500nA typical static supply current
• 3mm x 3mm x 0.8mm 8-pin TDFN package with exposed pad
• SPI-compatible serial interface supporting clock frequencies up to 5MHz

Applications

• Mechanical potentiometer replacement
• Low-drift programmable gain amplifier circuit configurations
• Audio volume control
• Liquid-crystal display (LCD) contrast control
• Low-drift programmable filters

Procurement Notes

Verify the component designation matches the specific 50kΩ variant within the MAX5422/MAX5423/MAX5424 family. Confirm that the ordering suffix corresponds to the standard tape-and-reel packaging format required for automated assembly processes. Ensure compliance with RoHS3 specifications as indicated by the '+' suffix.

Selection Notes

Select this model specifically when a 50kΩ total resistance is required; the MAX5423 offers 100kΩ and the MAX5424 provides 200kΩ. Verify that the application requires nonvolatile memory retention rather than volatile storage. Ensure the system design accommodates the 3mm x 3mm TDFN footprint and the thermal requirements associated with the exposed pad connection.

Part Context

This component belongs to the MAX542x series of 256-tap digital potentiometers manufactured by Analog Devices Inc./Maxim Integrated. The series shares identical pinouts, functional diagrams, and interface protocols, differing only in the nominal end-to-end resistance values assigned to each specific part number.

Replacement Considerations

Direct functional substitutes within the same package and specification profile include the MAX5423ETA+ (100kΩ) and MAX5424ETA+ (200kΩ). These parts are electrically compatible regarding interface and memory but require adjustment of circuit parameters due to the difference in nominal resistance.