MAX5439EUD+

Overview

The MAX5439EUD+ is a high-voltage digital potentiometer featuring 128 tap positions and an integrated uncommitted amplifier. It operates with analog supplies ranging from ±5V to ±15V, or single-supply configurations such as +10V to +30V, provided the VDD-VSS differential exceeds 9V. The device utilizes a separate digital supply (VCC) of +2.7V to +5.25V. It offers 100kΩ end-to-end resistance with low drift characteristics: 35ppm/°C for end-to-end and 5ppm/°C ratiometric temperature coefficients. Packaged in a 14-pin TSSOP, it supports glitchless switching and includes a power-on reset function that initializes the wiper to midscale.

Feature Summary

• Integrated uncommitted high-voltage amplifier
• 128-tap resolution with 100kΩ end-to-end resistance
• Low temperature coefficients: 35ppm/°C (end-to-end) and 5ppm/°C (ratiometric)
• Glitchless switching between resistor taps

Applications

• LCD screen contrast adjustment
• Data-acquisition systems
• Mechanical potentiometer replacement
• Low-drift programmable gain amplifier
• Audio volume control

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors. Confirm RoHS compliance status via official documentation. Ensure ordering suffixes match specific package and temperature requirements. Check for obsolescence notices or lifecycle changes directly from the manufacturer before procurement planning.

Selection Notes

Select the MAX5439EUD+ when a 100kΩ resistance value and an internal amplifier are required. Choose this over the MAX5436/MAX5438 if the 14-pin TSSOP package is preferred over the 10-pin µMAX. Ensure the application voltage differential (VDD - VSS) remains within the 9V to 31.5V range while maintaining appropriate logic levels for the VCC supply.

Part Context

The MAX5439EUD+ belongs to the MAX5436–MAX5439 family of ±15V digital potentiometers. This series replaces mechanical potentiometers with a digital interface. While the MAX5436 and MAX5438 lack an internal amplifier and use a 10-pin package, the MAX5437 and MAX5439 variants include the uncommitted amplifier and utilize a 14-pin TSSOP footprint.

Replacement Considerations

Direct functional replacements within the same family include the MAX5437EUD+ for identical performance with 50kΩ resistance. Cross-family comparisons should consider the MAX5436/MAX5438 if the internal amplifier is unnecessary and space constraints favor the smaller 10-pin µMAX package.

FAQ

What is the maximum analog supply voltage difference allowed?

The maximum allowable difference between VDD and VSS is 31.5V.

How does the device handle power-up states?

A power-on reset circuit forces the wiper position to midscale (Position 64) upon initialization.

Is the serial interface compatible with standard protocols?

Yes, it uses a 3-wire interface compatible with SPI, QSPI, and MICROWIRE standards.