MAX5478EUD+

Overview

The MAX5478EUD+ is a dual, nonvolatile, linear-taper digital potentiometer featuring an I2C-compatible serial interface. It provides two independent potentiometers, each with 256 tap positions and a nominal end-to-end resistance of 50kΩ. The device operates on a single supply voltage ranging from +2.7V to +5.25V. Key electrical characteristics include a maximum static supply current of 1µA, a 70ppm/°C end-to-end resistance temperature coefficient, and ±1 LSB integral nonlinearity in voltage-divider mode. It utilizes internal EEPROM for power-on recall of wiper positions.

Feature Summary

• Dual 256-Tap Nonvolatile Digital Potentiometers
• I2C-Compatible Serial Interface with Write-Protect Feature
• Power-On Recall of Wiper Position from Internal EEPROM
• Single-Supply Operation: +2.7V to +5.25V

Applications

• Mechanical Potentiometer Replacement
• Low-Drift Programmable-Gain Amplifiers
• Volume Control
• Liquid-Crystal Display (LCD) Contrast Control

Procurement Notes

Verify the package type matches the required footprint; the EUD suffix indicates a 14-pin TSSOP package. Confirm that the specific revision level meets system requirements. Ensure the I2C bus pullup resistors are selected appropriately for the operating speed and bus capacitance. Check write-protect pin configurations if EEPROM data retention is critical during operation.

Selection Notes

Select the MAX5478EUD+ when a 50kΩ resistance value is required. Choose this model over the MAX5477 (10kΩ) or MAX5479 (100kΩ) based on circuit impedance needs. The TSSOP-14 package is suitable for surface-mount PCB assembly. Consider the 1µA standby current for low-power applications requiring infrequent adjustments.

Part Context

The MAX5478EUD+ belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile, I2C-interface digital potentiometers. These devices replace mechanical potentiometers by using a simple 2-wire digital interface to control wiper positions among 256 tap points. The family shares identical pinouts and functional descriptions, differing primarily in nominal resistance values.

Replacement Considerations

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