MAX5479ETE+T

Overview

The MAX5479ETE+T is a dual, nonvolatile, linear-taper digital potentiometer featuring 256 tap positions per channel. It operates on a single supply voltage ranging from +2.7V to +5.25V and utilizes a fast-mode I²C-compatible serial interface supporting data rates up to 400kbps. The device incorporates an internal EEPROM to store wiper positions for power-on recall and includes write-protect capabilities. It provides three nominal end-to-end resistance values across the family; this specific model offers 100kΩ with a temperature coefficient of 70ppm/°C end-to-end and 10ppm/°C ratiometric.

Feature Summary

• Dual-channel architecture with 256 discrete tap points per potentiometer
• Nonvolatile EEPROM memory retains wiper position for 50 years at +85°C
• I²C-compatible serial interface with three address inputs for eight unique combinations
• EEPROM write protection via dedicated WP pin to prevent accidental overwrites

Applications

• Mechanical potentiometer replacement in embedded systems
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control circuits
• Volume control applications requiring precise digital adjustment

Procurement Notes

Verify the component designation against official manufacturer documentation to confirm the specific 100kΩ resistance value associated with the MAX5479 variant. Ensure that the ordering suffix corresponds to the required tape-and-reel packaging format. Cross-reference the package marking code 'ABQ' to validate authenticity upon receipt.

Selection Notes

Select the MAX5479ETE+T when a 100kΩ end-to-end resistance is required for the application. Compare the ±1 LSB INL specification against system tolerance requirements. Confirm that the operating environment falls within the -40°C to +85°C temperature range and that the I²C bus timing constraints are compatible with the master controller.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile digital potentiometers. The family shares identical pinouts, interfaces, and functional characteristics, differing primarily in the nominal end-to-end resistance: 10kΩ for the MAX5477, 50kΩ for the MAX5478, and 100kΩ for the MAX5479.

Replacement Considerations

Direct replacements within the same series include the MAX5477ETE+T and MAX5478ETE+T, provided the resistance value difference is acceptable for the circuit design. Other variants such as the MAX5479EUD+ offer the same electrical performance in a TSSOP-14 package instead of the TQFN-EP-16.