MAX5409ETE+T

Overview

The MAX5409ETE+T is a dual, logarithmic taper digital potentiometer featuring two wipers per resistor. It operates on a single +4.5V to +5.5V supply and utilizes an SPI-compatible serial interface for control. The device provides 32 tap positions with 2dB steps between taps, maintaining a fixed 10kΩ end-to-end resistance. Key features include zero-crossing detection to minimize audible noise during transitions, a mute function providing -90dB attenuation, and low standby current of 0.5µA. It is housed in a 16-pin Thin QFN package and specified over the -40°C to +85°C temperature range.

Feature Summary

• Dual potentiometers with two wipers each (W0A/W0B and W1A/W1B) for independent channel control
• Logarithmic taper with 2dB step resolution across 32 tap positions
• Zero-crossing detection circuitry reduces audible clicks and pops during wiper transitions
• SPI-compatible 3-wire serial interface with readback capabilities via DOUT pin

Applications

• Stereo volume control with front and rear speaker balancing
• Audio signal fading and balancing applications
• Replacement for mechanical potentiometers in audio circuits

Procurement Notes

Verify the component matches the specific dual-wiper configuration required for the design. Confirm that the power supply voltage aligns with the +4.5V to +5.5V operating range specified for this part number. Ensure the PCB footprint corresponds to the 16-pin Thin QFN package dimensions provided in the datasheet.

Selection Notes

Select the MAX5409ETE+T when dual independent wipers are necessary for each channel, unlike the MAX5408 which has only one wiper per resistor. This model is suitable for applications requiring simultaneous control of multiple output points within a stereo path. Verify compatibility with the system's logic voltage levels, as VLOGIC supports up to 5.5V.

Part Context

This component belongs to the MAX5408–MAX5411 family of dual, audio, log taper digital potentiometers. The MAX5409 specifically distinguishes itself by offering two wipers per potentiometer, enabling complex routing such as front/rear audio balancing. It shares the same 10kΩ resistance value and serial interface protocol as its siblings but differs in internal terminal availability.

Replacement Considerations

The MAX5411ETE+T serves as a direct functional substitute within the same package and specification profile. Both parts feature dual wipers per resistor and identical electrical characteristics. Ensure the replacement maintains the correct supply voltage requirements (+4.5V to +5.5V) and package type.