MAX5527GTA+T

Overview

The MAX5527GTA+T is a one-time programmable, linear-taper digital potentiometer manufactured by Analog Devices Inc./Maxim Integrated. It provides an end-to-end resistance of 100kΩ with 64 wiper tap positions accessible between the high (H) and low (L) terminals. The device operates from a single +2.7V to +5.5V supply and features a simple 2-wire up/down digital interface for sequential adjustment. Key electrical characteristics 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 TDFN package with an exposed paddle.

Feature Summary

• One-Time Programmable (OTP) Memory: Allows setting and locking the power-on reset wiper position via a six-step sequence using an 11V PV pin.
• Digital Interface: Controlled via Chip Select (CS) and Up/Down (U/D) inputs to increment or decrement the wiper position through 64 taps.
• Low Power Consumption: Ultra-low standby supply current of 0.25µA typical and 1.5µA maximum.
• Precision Resistance: Offers 100kΩ end-to-end resistance (MAX5527) with 35ppm/°C end-to-end and 5ppm/°C ratiometric temperature coefficients.

Applications

• LCD contrast control and positive LCD bias voltage generation
• Programmable filters with adjustable gain and cutoff frequency
• Adjustable voltage references

Procurement Notes

Verify component authenticity and packaging integrity upon receipt. Confirm the presence of the exposed paddle on the TDFN-EP package for proper thermal dissipation and grounding. Ensure the ordering suffix matches the specific package type required for the design.

Selection Notes

Select the MAX5527GTA+T when a 100kΩ end-to-end resistance is required. Choose the TDFN-EP package for applications needing enhanced thermal performance compared to the µMAX variant. Verify that the application supports the 11V programming voltage requirement if OTP functionality is utilized.

Part Context

This component belongs to the MAX5527/MAX5528/MAX5529 family of linear-taper digital potentiometers. The MAX5527 variant specifically provides 100kΩ resistance, distinguishing it from the 50kΩ MAX5528 and 10kΩ MAX5529. All family members share identical pinouts, interfaces, and OTP capabilities.

Replacement Considerations

Direct replacements within the same family include MAX5527GUA+T (µMAX package). For different resistance values, consider MAX5528GTA+T (50kΩ) or MAX5529GTA+T (10kΩ). Ensure any substitute maintains the 64-tap resolution and 2-wire interface compatibility.

FAQ

How is the wiper position locked after programming?

The wiper position is locked by pulsing the CS pin high seven times during the one-time programming sequence. This disables the up/down interface, converting the device into a fixed resistor divider.

What is the function of the PV pin?

The PV pin is used for one-time programming. It requires an external voltage source of +11V to +11.55V during the programming sequence to set the power-on reset position.

What happens if the device is programmed more than once?

If programmed multiple times, all applied values are ORed together. For example, programming 010101 followed by 101010 results in 111111.