MAX5403EUB

Overview

The MAX5403EUB is a dual digital potentiometer IC from the MAX5403/MAX5404/MAX5405 family, manufactured by Analog Devices (Maxim Integrated). It integrates one 3-terminal potentiometer and one 2-terminal variable resistor within a compact 10-pin µMAX package. The device operates on a single supply voltage ranging from +2.7V to +5.5V with an ultra-low supply current of 0.1µA. It features 256-tap resolution controlled via a 3-wire SPI-compatible serial interface. Key electrical characteristics include a nominal end-to-end temperature coefficient of 35ppm/°C, a ratiometric temperature coefficient of 5ppm/°C, and a power-on reset function that initializes the wiper to the midscale position.

Feature Summary

• Dual configuration: One 3-terminal potentiometer and one 2-terminal variable resistor
• 256-tap resolution with glitchless switching between resistor taps
• Ultra-low supply current of 0.1µA at VDD = +2.7V
• Power-on reset (POR) sets wiper to midscale (Position 128)
• Low drift: 35ppm/°C end-to-end and 5ppm/°C ratiometric temperature coefficients

Applications

• Mechanical potentiometer replacement
• Low-drift programmable gain amplifier (PGA)
• Adjustable voltage reference circuits
• Programmable filters, delays, and time constants
• Impedance matching networks

Procurement Notes

Verify the specific resistance value for the MAX5403 variant, which is 10kΩ, against system requirements. Confirm compatibility with the 10-pin µMAX surface-mount package dimensions. Ensure the design supports the required 3-wire serial interface timing specifications, including maximum SCLK frequency of 10 MHz. Check for RoHS compliance status as indicated in official documentation.

Selection Notes

Select the MAX5403EUB when a 10kΩ resistance value is required; other family members offer 50kΩ (MAX5404) or 100kΩ (MAX5405). Consider the low 5ppm/°C ratiometric tempco for applications requiring stable gain over temperature variations. The volatile memory type requires state retention logic if power loss persistence is needed. Verify that the 0.1µA standby current meets strict power budget constraints.

Part Context

The MAX5403EUB belongs to the MAX5403/MAX5404/MAX5405 family of dual linear taper digital potentiometers. These devices are designed to replace mechanical potentiometers in space-constrained applications. The EUB suffix denotes the 10-pin µMAX package code. The family shares identical pinouts and control interfaces, differing primarily in end-to-end resistance values.

Replacement Considerations

Direct substitutes within the same family include MAX5404EUB (50kΩ) and MAX5405EUB (100kΩ), provided the resistance value difference is acceptable for the circuit design. No other cross-manufacturer replacements are verified in the source material.