MAX5482EUD+T

Overview

The MAX5482EUD+T is a 10-bit, nonvolatile, linear-taper digital potentiometer manufactured by Analog Devices Inc. (formerly Maxim Integrated). It functions as a programmable voltage divider with a nominal end-to-end resistance of 50kΩ and 1024 tap positions. The device features an internal EEPROM that retains the wiper position during power cycles. It supports a 3-wire SPI-compatible serial interface operating at up to 7MHz or a pin-selectable up/down digital interface. Electrical specifications include a single supply voltage range of +2.7V to +5.25V or dual ±2.5V supplies, with a maximum standby current of 1.0µA. The component is specified for operation over an extended temperature range of -40°C to +85°C.

Feature Summary

• 10-bit resolution providing 1024 discrete tap positions
• Nonvolatile memory stores wiper position for power-on recall
• Pin-selectable 3-wire SPI-compatible or Up/Down digital interface
• Low standby supply current of 1.0µA (max)
• End-to-end resistance of 50kΩ with 35ppm/°C temperature coefficient

Applications

• Low-drift programmable gain amplifiers
• LCD contrast adjustment circuits
• Pressure sensor signal conditioning
• Gain and offset adjustment systems
• Mechanical potentiometer replacement in embedded designs

Procurement Notes

Verify the 'EUD' suffix indicates the 14-pin TSSOP package and the '+T' suffix denotes tape-and-reel packaging. Confirm the '+' designation ensures lead-free and RoHS compliance. Cross-reference the manufacturer's official documentation to ensure the specific reel quantity matches system requirements.

Selection Notes

Select the MAX5482 variant specifically for applications requiring a 50kΩ end-to-end resistance; the MAX5481 offers 10kΩ. Ensure the design utilizes high-impedance loads at the wiper terminal, as these devices are configured as voltage dividers rather than variable resistors. Verify that the control logic supports either the 3-wire SPI protocol or the Up/Down interface based on the SPI/UD pin configuration.

Part Context

This component belongs to the MAX5481–MAX5484 family of 10-bit nonvolatile digital potentiometers. While the MAX5481 and MAX5483 provide 10kΩ resistance, the MAX5482 and MAX5484 provide 50kΩ. The MAX5481/MAX5482 are designed as voltage dividers, whereas the MAX5483/MAX5484 function as variable resistors. All variants share identical pinouts and interface protocols.

Replacement Considerations

Direct functional substitutes within the same family include the MAX5481EUD+T (10kΩ voltage divider), MAX5483EUD+T (10kΩ variable resistor), and MAX5484EUD+T (50kΩ variable resistor). Selection depends on whether the application requires voltage division or variable resistance and the specific resistance value needed.

FAQ

Can the MAX5482 be used as a variable resistor?

No. The MAX5482 is a 3-terminal voltage divider. Pulling current through the wiper creates nonlinear voltage drops. For variable resistor applications, use the MAX5484.

How is the communication interface selected?

The interface is selected via the SPI/UD pin. Driving this pin high enables the 3-wire SPI-compatible interface, while driving it low enables the Up/Down digital interface.

What is the maximum clock frequency for the SPI interface?

The SCLK frequency can reach up to 7 MHz when operating in the SPI-compatible serial interface mode.