MAX5529GTA+T

Overview

The MAX5529GTA+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 10kΩ with 64 wiper tap positions and operates on a single +2.7V to +5.5V supply. The device features ultra-low static supply current (max 1.5µA) and low temperature coefficients (35ppm/°C end-to-end, 5ppm/°C ratiometric). Packaged in an 8-pin TDFN-EP (3mm x 3mm), it supports a simple 2-wire up/down interface for wiper adjustment and includes a factory calibration feature that allows the power-on reset position to be programmed once.

Feature Summary

• One-Time Programmable Wiper Position: Allows setting and locking the power-on reset position via a six-step PV programming sequence.
• Digital Interface Control: Adjusts wiper position sequentially using a simple 2-wire Up/Down interface accessible when CS is low.
• High Precision Parameters: Offers 64 tap positions, 10kΩ nominal resistance, and low temperature coefficients of 35ppm/°C (end-to-end) and 5ppm/°C (ratiometric).
• Low Power Consumption: Features an ultra-low standby supply current of 0.25µA (typical) and 1.5µA (maximum).

Applications

• LCD Contrast Control: Used as a voltage divider or variable resistor to adjust display bias voltages.
• Programmable Filters: Adjusts gain and cutoff frequency in active filter circuits.
• Adjustable Voltage References: Functions as feedback resistors in adjustable reference designs.

Procurement Notes

Verify the package marking code AOI to confirm the specific MAX5529 variant. Ensure the ordering suffix matches the required lead-free/RoHS compliance status (+). Confirm the package type is the 8-pin TDFN-EP (3mm x 3mm) rather than the µMAX option.

Selection Notes

Select the MAX5529GTA+T specifically for applications requiring a 10kΩ end-to-end resistance. Compare against MAX5527 (100kΩ) and MAX5528 (50kΩ) if different resistance values are needed. Verify that the 64-position resolution and 1000kHz bandwidth meet the circuit requirements.

Part Context

This component belongs to the MAX5527/MAX5528/MAX5529 family of one-time programmable, linear-taper digital potentiometers. These devices replace mechanical potentiometers using a 2-wire digital interface. The family shares identical pinouts, interfaces, and packaging options, differing primarily in their end-to-end resistance values.

Replacement Considerations

Direct replacements within the same family include MAX5527GTA+T (100kΩ) and MAX5528GTA+T (50kΩ) if resistance scaling is acceptable. For alternative packages, the MAX5529GUA+T offers the same electrical characteristics in an 8-pin µMAX package.

FAQ

How is the wiper position locked after programming?

The wiper position is locked by performing the one-time programming sequence with seven CS pulses instead of six. This disables the up/down interface, effectively converting the device into a fixed resistor divider.

What is the maximum continuous current allowed for the MAX5529 terminals?

The maximum continuous current into the H, L, and W terminals for the MAX5529 is ±2.0mA.

What is the typical standby supply current?

The typical standby supply current is 0.25µA, with a maximum specification of 1.5µA.