MAX9722AETE+

Audio Amplifiers Overview

The MAX9722AETE+ is a stereo headphone amplifier utilizing DirectDrive architecture, eliminating the need for bulky DC-blocking capacitors. It operates on a single supply from 2.4V to 5.5V and delivers up to 130mW per channel into a 32Ω load or 70mW into a 16Ω load. The device features adjustable gain via external resistors, low 0.009% THD+N, and an integrated charge pump creating a negative rail for ground-referenced outputs. It includes comprehensive click-and-pop suppression, ±8kV ESD protection, and short-circuit/thermal-overload protection.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates large output coupling capacitors by generating an internal negative supply rail.
• Adjustable voltage gain configured through external feedback and input resistors.
• Integrated click-and-pop suppression circuitry prevents audible transients during power-up and shutdown.
• High power-supply rejection ratio allows operation directly from noisy digital supplies without additional linear regulators.

Audio Amplifiers Applications

• Notebook and desktop PCs
• MP3 players and portable audio equipment
• Flat-panel monitors
• Cellular phones and smart phones

Audio Amplifiers Procurement Notes

Verify that the component matches the specific MAX9722A variant with externally adjustable gain, distinct from the fixed-gain MAX9722B. Confirm the package type corresponds to the 16-pin Thin QFN (3mm x 3mm x 0.8mm) with exposed paddle as indicated by the 'ETE' suffix. Ensure compliance with RoHS standards if required by the application environment.

Audio Amplifiers Selection Notes

Select this component when board space is limited and the elimination of large tantalum or electrolytic DC-blocking capacitors is required. It is suitable for designs requiring differential inputs for enhanced noise cancellation and high PSRR to operate cleanly from unregulated digital power rails. Consider the thermal dissipation capabilities of the thin QFN package relative to the expected ambient temperature and load impedance.

Audio Amplifiers Part Context

This device belongs to the MAX9722 family of stereo headphone amplifiers designed for portable electronics. It shares the core DirectDrive technology with the MAX9722B but differs in its gain configuration flexibility. The family addresses the constraints of modern mobile devices by reducing component count and height while maintaining high audio fidelity and robust protection features.

Audio Amplifiers Replacement Considerations

The MAX9722AEUE serves as a pin-compatible alternative in a 16-pin TSSOP package. For applications requiring fixed gain, the MAX9722B series may be considered, though it lacks external gain adjustment. Verify that any substitute maintains the same operating voltage range and thermal characteristics.

Audio Amplifiers FAQ

How does the DirectDrive architecture affect low-frequency response?

By eliminating large DC-blocking capacitors, the DirectDrive architecture prevents the formation of a high-pass filter that would otherwise attenuate low frequencies. This ensures full bass response without the distortion associated with capacitor voltage coefficients.

What is the function of the SHDN pin?

The SHDN pin controls the shutdown mode. Driving it low disables the amplifiers and charge pump, reducing supply current to 0.1µA and setting the output impedance to 10kΩ. Driving it high enables normal operation.