MAX5423ETA+T

Overview

The MAX5423ETA+T is a nonvolatile, linear-taper digital potentiometer featuring 100kΩ end-to-end resistance and 256 tap points. It operates on a single supply voltage ranging from +2.7V to +5.25V with a typical static supply current of 500nA. The device utilizes an internal EEPROM to store the wiper position for initialization during power-up. It communicates via a 3-wire SPI-compatible serial interface supporting data rates up to 5MHz. Key electrical characteristics include ±0.5 LSB INL and DNL in voltage-divider mode, a 35ppm/°C end-to-end temperature coefficient, and a 5ppm/°C ratiometric temperature coefficient.

Feature Summary

• Nonvolatile memory retains wiper position upon power-up or interface command
• SPI-compatible serial interface allows communication at data rates up to 5MHz
• Low standby current of 500nA (typical) with single-supply operation (+2.7V to +5.25V)
• ±0.5 LSB Integral Nonlinearity (INL) and Differential Nonlinearity (DNL) in voltage-divider mode

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 that the ordering suffix '+T' corresponds to tape-and-reel packaging as indicated in standard Maxim Integrated product naming conventions. Confirm the 'ETA' designation aligns with the -40°C to +85°C extended temperature range and TDFN-EP package type specified in the datasheet selector guide. Ensure compliance with RoHS standards if required by the application environment.

Selection Notes

Select the MAX5423ETA+T specifically when a nominal end-to-end resistance of 100kΩ is required. This model provides 256 discrete tap positions suitable for precise digital adjustment. Consider the 35ppm/°C end-to-end temperature coefficient for applications requiring low drift. Ensure the system voltage remains within the +2.7V to +5.25V operating range to maintain specified performance metrics.

Part Context

The MAX5423ETA+T belongs to the MAX5422/MAX5423/MAX5424 family of 256-tap, nonvolatile, SPI-interface digital potentiometers. While sharing identical pinouts, functional diagrams, and interface protocols, this specific part number is distinguished by its 100kΩ nominal resistance value. The MAX5422 variant offers 50kΩ, and the MAX5424 variant provides 200kΩ, allowing designers to choose based on specific impedance requirements without changing the board layout.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.