MAX5478EUD

Overview

The MAX5478EUD+ is a dual, nonvolatile digital potentiometer manufactured by Analog Devices (Maxim Integrated). It features two independent 50 kOhm resistive elements with 256 tap positions and linear taper characteristics. The device operates on a single supply voltage ranging from 2.7 V to 5.25 V with a typical operating current of 1 uA. Communication is handled via a standard I2C-compatible serial interface. The unit is housed in a 14-lead TSSOP surface-mount package and supports an industrial temperature range from -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 256 nonvolatile tap positions per channel
• I2C-compatible serial control interface for simplified system integration
• Low power consumption with 1 uA operating current at 2.7 V
• Linear taper resistance profile with 25% tolerance

Applications

• Programmable gain amplifiers requiring precise gain adjustment
• Voltage reference trimming in sensor signal conditioning circuits
• Audio volume control systems utilizing digital interfaces
• Calibration storage for analog front-end parameters

Procurement Notes

Verify the specific suffix designation when ordering, as the base model may correspond to different packaging or lead-free variants such as EUD+. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure the selected variant matches the required tape-and-reel or tube packaging format for the intended manufacturing process.

Selection Notes

Select this component when dual-channel nonvolatile adjustment is required within a compact TSSOP footprint. The 50 kOhm value suits moderate impedance applications, while the 256-step resolution provides fine granularity. Verify that the host microcontroller supports the necessary I2C clock speeds and address configurations for reliable communication.

Part Context

This part belongs to the MAX5478 family of dual digital potentiometers. Related variants include the MAX5479 and MAX5480 series, which offer similar functionalities but may differ in resistance values, interface types, or package options. The MAX5478EVCMODU serves as an evaluation kit for testing these devices.

Replacement Considerations

Direct pin-to-pin replacements within the same family include the MAX5478ETE+ in a TQFN package. Cross-family alternatives like the MAX5468 or MAX5474 offer single-channel configurations with different tap counts or interfaces.