MAX5527GUA+T

Overview

The MAX5527GUA+T is a one-time programmable, linear-taper digital potentiometer manufactured by Analog Devices (Maxim Integrated). It provides an end-to-end resistance of 100kΩ with 64 wiper tap positions. The device operates on a single +2.7V to +5.5V supply and features a simple 2-wire up/down interface for sequential adjustment. Key electrical parameters include a 35ppm/°C end-to-end temperature coefficient and a maximum static supply current of 1.5µA. It is housed in an 8-pin µMAX package and is guaranteed to operate within the -40°C to +105°C temperature range.

Feature Summary

• One-time programmable feature allows setting and locking the power-on reset wiper position via a six- or seven-pulse serial sequence.
• 64 discrete wiper tap positions accessible through a standard 2-wire up/down digital interface.
• Low temperature coefficients of 35ppm/°C for end-to-end resistance and 5ppm/°C ratiometric.
• Ultra-low standby supply current of 1.5µA maximum, suitable for battery-operated applications.

Applications

• LCD contrast control using voltage biasing adjustments
• Programmable filters with adjustable gain and cutoff frequency
• Adjustable voltage references utilizing feedback resistor networks

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the '+' suffix in the part number. Ensure proper handling procedures are followed during storage and assembly to maintain device reliability.

Selection Notes

Select this model when a 100kΩ total resistance is required. Compare against MAX5528 (50kΩ) and MAX5529 (10kΩ) if different resistance values are needed. Verify that the 8-pin µMAX package dimensions fit the PCB layout constraints compared to the TDFN alternative.

Part Context

This component belongs to the MAX5527/MAX5528/MAX5529 family of linear-taper digital potentiometers. These devices function as mechanical potentiometer replacements, offering digital control over resistance values without moving parts. The GUA+T designation specifically identifies the 100kΩ variant in the 8-pin µMAX lead-free package.

Replacement Considerations

Direct functional substitutes within the same series include MAX5528GUA+T (50kΩ) and MAX5529GUA+T (10kΩ). For identical specifications but different packaging, consider MAX5527GTA+T which utilizes an 8-pin TDFN-EP package instead of µMAX.

FAQ

How is the wiper position locked after programming?

The wiper position is locked by performing a seven-pulse CS high sequence during the one-time programming mode. This disables the up/down interface, preventing further adjustments.

What is the maximum operating voltage for the PV pin during programming?

The external voltage source connected to the PV pin must be in the range of +11V to +11.55V to successfully program the one-time memory.

What happens if the device is programmed more than once?

Since the device uses one-time programmable memory, applying multiple programming values results in all applied bits being ORed together, potentially altering the intended resistance profile.