MAX4409EUD+

Audio Amplifiers Overview

The MAX4409EUD+ is a stereo headphone amplifier utilizing DirectDrive architecture and common-mode sensing. It operates from a single 1.8V to 3.6V supply, delivering up to 80mW per channel into a 16Ω load with 0.002% THD+N. The device features a 5mA quiescent current, 86dB PSRR, and 96dB CMRR. It includes integrated click-and-pop suppression, ±8kV ESD protection, and a low-power shutdown mode reducing current to 6µA. The component is housed in a 20-pin Thin QFN package.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates bulky DC-blocking capacitors by generating ground-referenced outputs from a single supply.
• Common-mode voltage sense input corrects potential differences between the amplifier signal ground and headphone return to minimize ground-loop noise.
• Integrated charge pump creates an internal negative supply, allowing bipolar operation and increased dynamic range without external coupling components.
• Comprehensive click-and-pop suppression circuitry prevents audible transients during power-up and power-down sequences.

Audio Amplifiers Applications

• Notebooks
• Desktop PCs
• Cellular Phones
• Portable Audio Equipment

Audio Amplifiers Procurement Notes

Verify the specific suffix 'EUD+' against the manufacturer's official ordering guide to confirm the exact temperature range and RoHS compliance status. Ensure the pin configuration matches the 20-pin Thin QFN layout. Cross-reference the datasheet revision date to validate that all electrical characteristics align with your design requirements before finalizing procurement.

Audio Amplifiers Selection Notes

Select this component for designs requiring high audio fidelity with minimal external passive components. The DirectDrive feature significantly reduces board space and cost by removing large output capacitors. Consider the common-mode sense capability if interfacing with equipment prone to ground loops. Verify that the 1.8V to 3.6V supply range meets the system's power constraints.

Audio Amplifiers Part Context

The MAX4409 belongs to Maxim Integrated's DirectDrive family of stereo headphone amplifiers. This series focuses on eliminating the need for large DC-blocking capacitors through patented biasing techniques. The MAX4409 specifically adds common-mode sensing to address ground-loop issues in portable and desktop audio applications.

Audio Amplifiers Replacement Considerations

Consult the manufacturer's obsolescence notices and cross-reference tools for verified substitute part numbers. Do not assume functional equivalence with other models in the series without verifying pinout and electrical specifications.

Audio Amplifiers FAQ

How does the MAX4409 eliminate the need for DC-blocking capacitors?

It uses a patented DirectDrive architecture with an internal charge pump to create a negative supply rail, allowing the outputs to be biased at ground potential rather than mid-supply.

What is the function of the COM pin?

The COM pin provides common-mode voltage sensing to correct for mismatches between the device's signal ground and the headphone jack return, minimizing ground-loop noise.