MAX5438EUB+

Overview

The MAX5438EUB+ is a 100kΩ, 128-tap high-voltage digital potentiometer in a 10-pin µMAX package. It operates with a separate digital supply (VCC) of +2.7V to +5.25V and analog supplies (VDD/VSS) spanning ±5V to ±15V, or single-supply ranges up to ±30V. The device features volatile memory, linear taper, and glitchless switching via a 3-wire SPI/QSPI/MICROWIRE-compatible interface. Key electrical parameters include a 35ppm/°C end-to-end temperature coefficient, ±1 LSB INL/DNL, and a power-on reset to midscale.

Feature Summary

• High-voltage operation: Supports ±5V to ±15V dual supplies or single supplies from +10V to +30V
• Compact packaging: Available in 10-pin µMAX, half the size of comparable 8-pin SO devices
• Low drift characteristics: 35ppm/°C end-to-end and 5ppm/°C ratiometric temperature coefficients
• Glitchless switching: Ensures stable transitions between resistor taps without output glitches

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 distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific ordering suffixes that may indicate tape-and-reel packaging versus tube quantities. Ensure the supplier provides valid traceability documentation for the Analog Devices/Maxim Integrated part number.

Selection Notes

Select the MAX5438EUB+ when a 100kΩ resistance value is required. For 50kΩ applications, consider the MAX5436EUB+. Note that this model lacks an internal amplifier; designs requiring an integrated op-amp should utilize the MAX5439EUD variant instead. Verify that the system voltage differential (VDD - VSS) remains within the 9V to 31.5V operational range.

Part Context

This component belongs to the MAX5436–MAX5439 family of high-voltage digital potentiometers manufactured by Analog Devices/Maxim Integrated. The series offers 128-tap resolution in compact packages, replacing mechanical potentiometers with digitally controlled alternatives suitable for precision analog signal conditioning.

Replacement Considerations

The MAX5436EUB+ serves as a functional substitute if a 50kΩ end-to-end resistance is acceptable. No other direct cross-model replacements are confirmed in public documentation.