MAX9722AETE+T

Audio Amplifiers Overview

The MAX9722AETE+T is a stereo headphone amplifier utilizing DirectDrive architecture. 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, high PSRR of 80dB at 217Hz, and low THD+N of 0.009%. It includes integrated click-and-pop suppression, ±8kV ESD protection, and short-circuit/thermal-overload protection. The package is a 16-pin Thin QFN (3mm x 3mm x 0.8mm) with an exposed paddle.

Audio Amplifiers Feature Summary

• DirectDrive output architecture eliminates the need for bulky DC-blocking capacitors by generating ground-referenced outputs from a single supply.
• Integrated charge pump creates a negative rail, allowing bipolar operation without external inductors or large coupling components.
• Comprehensive click-and-pop suppression circuitry prevents audible transients during power-up and shutdown sequences.
• Differential input configuration enhances noise cancellation and immunity against RF interference common in portable devices.

Audio Amplifiers Applications

• Notebook and Desktop PCs
• MP3 Players
• Flat-Panel Monitors
• Cellular Phones
• Portable Audio Equipment

Audio Amplifiers Procurement Notes

Verify the component matches the specific 'A' variant which supports externally adjustable gain via external resistors, distinct from the fixed-gain 'B' version. Confirm the suffix '+T' indicates tape-and-reel packaging and '+' denotes lead-free/RoHS compliance. Ensure the supplier provides traceability documentation consistent with Analog Devices/MAXIM Integrated standards for this active part number.

Audio Amplifiers Selection Notes

Select this component when board space is limited and the elimination of large output capacitors is required. Choose the MAX9722A over the MAX9722B if external gain adjustment or filter configuration is necessary. Ensure the application supply voltage remains within the 2.4V to 5.5V range. Consider the 16-pin TQFN package constraints for thermal dissipation if operating near maximum power levels.

Audio Amplifiers Part Context

This device belongs to the MAX9722 family of stereo headphone amplifiers designed for portable electronics. It shares the DirectDrive technology with other Maxim Integrated audio products but is distinguished by its specific gain configuration options and package footprint. The family addresses the industry shift toward smaller form factors by removing passive components typically required for single-supply biasing.

Audio Amplifiers Replacement Considerations

MAX9722AEUE+T: Same electrical specifications as the AETE variant but housed in a 16-pin TSSOP package instead of the Thin QFN. Verify pinout compatibility and thermal performance differences between the QFN and TSSOP packages before substitution.

Audio Amplifiers FAQ

How does the DirectDrive architecture affect low-frequency response?

By eliminating DC-blocking capacitors, the DirectDrive architecture removes the high-pass filter effect associated with traditional coupling capacitors, thereby preventing low-frequency attenuation and distortion caused by 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.