MAX5404EUB+

Overview

The MAX5404EUB+ is a dual digital potentiometer IC from Analog Devices/Maxim Integrated, featuring one 3-terminal potentiometer and one 2-terminal variable resistor. It operates on a single supply voltage of +2.7V to +5.5V with an ultra-low supply current of 0.1µA. The device provides 256-tap resolution for precise resistance adjustment via a 3-wire SPI-compatible serial interface. Key electrical characteristics include a nominal end-to-end temperature coefficient of 35ppm/°C and a ratiometric coefficient of 5ppm/°C. It includes glitchless switching between taps and a power-on reset (POR) function that sets the wiper to the midscale position upon power-up.

Feature Summary

• Dual configuration: One 3-terminal potentiometer and one 2-terminal variable resistor
• 256-tap positions with linear taper and 8-bit resolution
• Ultra-low supply current of 0.1µA at VDD = +2.7V
• Glitchless switching between resistor taps
• Power-on reset (POR) sets wiper to midscale (Position 128)
• 3-wire SPI-compatible serial interface (CS, DIN, SCLK)

Applications

• Mechanical potentiometer replacement
• Low-drift programmable gain amplifier (PGA)
• Volume control
• LCD screen adjustment
• Adjustable voltage reference

Procurement Notes

Verify the component is the MAX5404 variant with 50kΩ resistance before procurement. Confirm the package is 10-pin µMAX. Check RoHS compliance status as indicated in official documentation. Ensure the ordering suffix matches the required tape-and-reel or tube packaging if applicable, though specific packaging quantities are not detailed here.

Selection Notes

Select the MAX5404 when a 50kΩ end-to-end resistance is required. Compare against MAX5403 (10kΩ) and MAX5405 (100kΩ) for different impedance needs. Consider the low 5ppm/°C ratiometric temperature coefficient for applications requiring stable gain over temperature variations. Ensure the system supports a 3-wire serial interface for control.

Part Context

The MAX5404 is part of the MAX5403/MAX5404/MAX5405 family of dual digital potentiometers. These devices are designed to replace mechanical potentiometers in space-constrained applications. They share the same 10-pin µMAX package and pinout, differing primarily in their nominal end-to-end resistance values (10kΩ, 50kΩ, and 100kΩ respectively).

Replacement Considerations

Direct replacements within the same family include MAX5403EUB+ (10kΩ) and MAX5405EUB+ (100kΩ), provided the resistance value difference is acceptable for the application. Verify that any substitute maintains the 256-tap resolution and 3-wire serial interface compatibility.