MAX9722BETE

Audio Amplifiers Overview

The MAX9722BETE is a stereo headphone amplifier from Maxim Integrated, designed for portable equipment. It features DirectDrive architecture for ground-referenced outputs from a single supply, eliminating DC-blocking capacitors. The device offers fixed -2V/V gain, 130mW per channel into 32Ω at 5V, and operates on a 2.4V to 5.5V supply. Key specifications include 80dB PSRR, 0.009% THD+N, 5.5mA quiescent current, and ±8kV ESD protection. It is housed in a space-saving 16-pin Thin QFN (3mm x 3mm x 0.8mm) package.

Audio Amplifiers Feature Summary

• DirectDrive architecture produces ground-referenced outputs from a single supply, removing the need for bulky DC-blocking capacitors.
• Fixed internal gain of -2V/V with integrated click-and-pop suppression for clean audio transitions.
• High power supply rejection ratio (PSRR) of 80dB at 217Hz eliminates the requirement for low-dropout regulators.
• Robust protection features including short-circuit and thermal-overload protection alongside ±8kV ESD-protected outputs.

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 the exact suffix against official datasheets, as variations like +T or -T indicate specific packaging or tape-and-reel configurations. Confirm that the 'B' variant corresponds to the fixed -2V/V gain setting rather than the adjustable 'A' version. Ensure the component matches the 16-pin TQFN footprint dimensions of 3mm x 3mm x 0.8mm for proper PCB integration.

Audio Amplifiers Selection Notes

Select this component when board space is limited and capacitor-free designs are required. The fixed -2V/V gain suits applications where input signal levels are consistent. Consider the MAX9722A if external gain adjustment is necessary. The wide operating voltage range supports both 3.3V and 5V systems, making it versatile for various portable electronics.

Audio Amplifiers Part Context

The MAX9722BETE belongs to the MAX9722 family of stereo headphone amplifiers. It shares the same footprint and DirectDrive technology as the MAX9722A but differs in gain configuration. The family is optimized for portable devices, offering high performance in a minimal package size while maintaining low power consumption and robust noise cancellation through differential inputs.

Audio Amplifiers Replacement Considerations

The MAX9722AETE is a pin-compatible alternative with externally adjustable gain instead of fixed -2V/V. Designers requiring variable gain settings should consider this substitute. Other DirectDrive amplifiers may require schematic modifications due to differing gain structures or pinouts.