MAX5405EUB

Overview

The MAX5405EUB is a dual digital potentiometer featuring one 3-terminal potentiometer and one 2-terminal variable resistor, housed in a 10-pin µMAX package. It operates on a single +2.7V to +5.5V supply with an ultra-low current of 0.1µA. The device provides 256 tap positions controlled via a 3-wire SPI-compatible interface. Key electrical characteristics include a nominal end-to-end temperature coefficient of 35ppm/°C and a ratiometric coefficient of 5ppm/°C. It ensures glitchless switching between taps and includes a power-on reset function that sets the wiper to midscale.

Feature Summary

• Dual configuration: one 3-terminal potentiometer and one 2-terminal variable resistor
• 256-tap resolution with glitchless switching capability
• Ultra-low supply current of 0.1µA at +2.7V
• Power-on reset 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 and time constant adjustments
• Impedance matching networks

Procurement Notes

Verify the specific ordering suffix 'EUB' corresponds to the 10-pin µMAX package and industrial temperature range (-40°C to +85°C). Confirm compatibility with standard 3-wire SPI interfaces by checking CS, DIN, and SCLK signal levels against the system logic voltages. Ensure proper decoupling with a 0.1µF capacitor near the VDD pin as specified in the datasheet.

Selection Notes

Select the MAX5405EUB when a 100kΩ end-to-end resistance is required for the digital potentiometer functions. Compare against MAX5403 (10kΩ) and MAX5404 (50kΩ) based on circuit impedance requirements. Consider the 10-pin µMAX footprint constraints and verify that the 0.1µA supply current meets low-power design goals. Ensure the application benefits from the low ratiometric temperature coefficient for stability over temperature variations.

Part Context

The MAX5405EUB belongs to the MAX5403/MAX5404/MAX5405 family of dual linear taper digital potentiometers manufactured by Maxim Integrated (now Analog Devices). This family shares identical pinouts, control interfaces, and functional architectures, differing primarily in the nominal end-to-end resistance values. The EUB suffix denotes the specific 10-lead µMAX package variant designed for space-constrained applications.

Replacement Considerations

Direct replacements within the same package and functionality are the MAX5403EUB (10kΩ) and MAX5404EUB (50kΩ), provided the resistance value change is acceptable for the circuit design. Verify that any substitute component maintains the 3-wire SPI interface compatibility and the -40°C to +85°C operating temperature range.