MAX5415EUD

Overview

The MAX5415EUD is a dual linear taper digital potentiometer from Maxim Integrated, housed in a 14-pin TSSOP package. It contains two independent 3-terminal potentiometers with 256 tap positions (8-bit resolution). The end-to-end resistance for each channel is nominally 100kΩ, with a typical range of 75kΩ to 125kΩ. Operating on a single supply voltage between +2.7V and +5.5V, the device draws an ultra-low supply current of 0.1µA at 2.7V. It features glitchless switching between resistor taps and a power-on reset that sets the wiper to midscale (position 128) upon initialization.

Feature Summary

• Dual independent 3-terminal potentiometers with 256 tap positions
• Nominal 100kΩ end-to-end resistance per channel
• Glitchless switching between resistor taps
• Power-on reset sets wiper to midscale position

Applications

• Mechanical Potentiometer Replacement
• Low-Drift Programmable Gain Amplifier (PGA)
• Volume Control
• LCD Screen Adjustment
• Adjustable Voltage Reference

Procurement Notes

Verify the component marking against the datasheet pinout diagram to confirm authenticity. Ensure the operating environment remains within the specified -40°C to +85°C temperature range. Check that the supply voltage does not exceed the absolute maximum rating of +6V to prevent permanent damage. Confirm compatibility with the 3-wire SPI interface timing requirements before integration.

Selection Notes

Select the MAX5415EUD when a nominal 100kΩ resistance value is required for the application. This model is suitable for designs needing low-drift performance with a ratiometric temperature coefficient of 5ppm/°C. It is appropriate for systems powered by single supplies between 2.7V and 5.5V where ultra-low standby current is critical. Consider the 14-pin TSSOP footprint constraints during PCB layout.

Part Context

The MAX5415EUD belongs to the MAX5413/MAX5414/MAX5415 family of dual digital potentiometers. While the MAX5413 offers 10kΩ and the MAX5414 provides 50kΩ resistance values, the MAX5415 specifically delivers 100kΩ. All variants share identical packaging, pin configurations, and control interfaces, differing only in their internal resistor string values.

Replacement Considerations

Direct replacements include the MAX5413EUD and MAX5414EUD, provided the circuit design can accommodate the lower 10kΩ or 50kΩ resistance values respectively. Other compatible parts must support the same 14-pin TSSOP package and 3-wire serial interface.

FAQ

What is the function of the Power-On Reset (POR) feature?

The POR circuitry automatically sets the wiper to the midscale position (code 128) at power-up, ensuring a known initial state.

How is the wiper position programmed?

The wiper position is controlled via a 3-wire serial interface consisting of Chip Select (CS), Data In (DIN), and Data Clock (SCLK).

What is the maximum SCLK frequency?

The maximum Serial Clock (SCLK) frequency is guaranteed to be 10 MHz.