MAX5528GUA+T

Overview

The MAX5528GUA+T is a linear-taper digital potentiometer with an end-to-end resistance of 50kΩ and 64 wiper tap positions. It operates on a single +2.7V to +5.5V supply, drawing a maximum static current of 1.5µA. The device features a 35ppm/°C end-to-end temperature coefficient and a 5ppm/°C ratiometric coefficient. It utilizes a simple 2-wire up/down interface for wiper adjustment and includes one-time programmable (OTP) memory to set and lock the power-on reset position. The component is housed in an 8-pin µMAX package and is rated for operation from -40°C to +105°C.

Feature Summary

• One-Time Programmable Memory: Allows setting and locking the power-on wiper position via a six-step sequence using an 11V PV pin.
• Digital Interface: Controlled by a 2-wire serial interface (CS and U/D pins) for sequential increment or decrement operations.
• Low Power Consumption: Ultra-low standby supply current of 1.5µA maximum, suitable for battery-operated applications.
• Precision Characteristics: Offers 64 taps with a 35ppm/°C end-to-end temperature coefficient and ±1 LSB INL/DNL.

Applications

• LCD contrast control requiring digitally adjustable voltage biasing
• Programmable filters with adjustable gain or cutoff frequency
• Adjustable voltage references using feedback resistor networks

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape-and-reel packaging, as standard datasheet tables list 'MAX5528GUA+' without the suffix. Confirm availability status, as this component may be subject to limited supply or discontinuation notices. Ensure the design accommodates the 11V programming requirement if OTP functionality is utilized.

Selection Notes

Select the MAX5528GUA+T when a 50kΩ end-to-end resistance is required. Compare against MAX5527 (100kΩ) and MAX5529 (10kΩ) for different resistance needs. Consider the 8-pin µMAX package constraints and the need for an external 11V source only if one-time programming is necessary. Verify that the 2-wire interface timing meets system requirements.

Part Context

The MAX5528 is part of the MAX5527/MAX5528/MAX5529 family of one-time programmable, linear-taper digital potentiometers. These devices replace mechanical potentiometers in applications requiring digital control. The family shares identical pinouts and functional interfaces, differing primarily in end-to-end resistance values (100kΩ, 50kΩ, and 10kΩ respectively).

Replacement Considerations

Direct replacements within the same family include MAX5527GUA+ (100kΩ) and MAX5529GUA+ (10kΩ), provided the resistance value matches the circuit design. Other digital potentiometers with similar 2-wire interfaces and 64 taps may serve as alternatives if resistance and package differences are acceptable.