MAX5494ETE+

Overview

The MAX5494ETE+ is a dual, nonvolatile, linear-taper digital potentiometer featuring 10-bit resolution and 1024 tap points. It operates with a single supply voltage of +2.7V to +5.25V or dual supplies of ±2.5V. The device provides two independent programmable voltage dividers with an end-to-end resistance of 10kΩ. It utilizes a 3-wire SPI-compatible serial interface for data transfer at speeds up to 7MHz. Electrical specifications include a typical standby current of 1.5µA max and a wiper settling time of 5µs. The component is housed in a 16-pin TQFN package (5mm x 5mm) and is rated for operation from -40°C to +85°C.

Feature Summary

• Dual 10-bit nonvolatile linear-taper digital potentiometers with 1024 taps
• Internal EEPROM stores wiper position for initialization upon power-up
• 3-wire SPI-compatible serial interface supporting clock rates up to 7MHz
• Low standby current of 1.5µA maximum

Applications

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

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm temperature range and package type. Confirm RoHS compliance status as indicated by the '+' suffix in official datasheets. Ensure compatibility with system voltage levels and SPI timing requirements before integration.

Selection Notes

Select this model for applications requiring dual-channel programmable voltage division with nonvolatile memory retention. The 10kΩ resistance value suits moderate impedance circuits. Verify that the 10-bit resolution meets the required precision and that the 7MHz SPI speed aligns with the host controller's capabilities.

Part Context

This component belongs to the MAX5494–MAX5499 family of 10-bit digital potentiometers. While other variants in the series offer different configurations such as variable resistors or 50kΩ values, the MAX5494 specifically provides dual 3-terminal programmable voltage dividers with 10kΩ end-to-end resistance.

Replacement Considerations

Direct replacements within the same family include the MAX5495ETE+, which offers identical functionality but with a 50kΩ end-to-end resistance. Other variants like MAX5496/MAX5497 provide variable resistor configurations instead of voltage dividers.

FAQ

How does the device handle wiper position during power-up?

Upon power-up, the internal EEPROM automatically transfers the stored wiper position data to the volatile wiper register, initializing the device to its last saved state.

What is the maximum serial clock frequency supported?

The 3-wire SPI-compatible serial interface supports data rates up to 7MHz.

Can the MAX5494ETE+ operate with dual power supplies?

Yes, the device supports dual power supply operation with VDD ranging from +2.5V to +5.25V and VSS ranging from -2.5V to -0.2V, provided the total difference (VDD - VSS) does not exceed 5.25V.