MAX5439EUD+T

Overview

The MAX5439EUD+T is a high-voltage, single-channel digital potentiometer featuring 128 tap positions and a 100kΩ end-to-end resistance. It operates with separate analog supplies (VDD/VSS) ranging from ±5V to ±15V or single-supply configurations up to +30V/-30V, provided the differential voltage remains between 9V and 31.5V. The device utilizes a low-voltage digital supply (VCC) of +2.7V to +5.25V. Key electrical characteristics include a wiper resistance of 0.9Ω to 2kΩ, integral nonlinearity of ±1 LSB, and a 3-wire SPI-compatible serial interface. It incorporates an on-chip uncommitted high-voltage amplifier and ensures glitchless switching between taps.

Feature Summary

• High-voltage operation with analog supply range of ±5V to ±15V or single-supply voltages up to +30V/-30V
• Integrated uncommitted high-voltage operational amplifier for board space reduction
• Low-drift performance with 35ppm/°C end-to-end and 5ppm/°C ratiometric temperature coefficients
• Glitchless switching mechanism prevents transient spikes during tap transitions

Applications

• LCD screen contrast adjustment circuits
• Data-acquisition systems requiring programmable gain
• Replacement for mechanical potentiometers in harsh environments
• Low-drift programmable gain amplifiers
• Audio volume control applications

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors. Confirm RoHS compliance status via official documentation. Ensure ordering suffixes match the required package type and temperature range specifications before procurement.

Selection Notes

Select the MAX5439EUD+T when a 100kΩ resistance value and integrated amplifier are required. Choose this model over the MAX5437 for higher resistance values. Ensure the application supports the 14-pin TSSOP footprint and requires the specific high-voltage analog supply capabilities defined in the datasheet.

Part Context

This component belongs to the MAX5436–MAX5439 family of ±15V digital potentiometers. It shares functional similarities with the MAX5437 but differs in having a 100kΩ end-to-end resistance instead of 50kΩ. Both devices utilize the same 14-pin TSSOP package and feature the internal uncommitted amplifier.

Replacement Considerations

Public confirmed substitute part numbers: MAX5437EUD+T (identical function with 50kΩ resistance).

FAQ

What is the power-on reset state of the wiper?

Upon power-up, the wiper automatically resets to midscale, which corresponds to position 64.

How does the device handle analog supply voltages?

The analog supplies VDD and VSS must maintain a differential voltage between 9V and 31.5V. This allows for dual supplies like ±5V to ±15V or single supplies such as +10V, +15V, +30V, -30V, etc.

What is the resolution of the digital potentiometer?

The device offers 128 tap positions, providing 7-bit resolution for adjusting the wiper position.