MAX9722BETE+TG29

Audio Amplifiers Overview

The MAX9722BETE+TG29 is a stereo headphone amplifier from the MAX9722 series, manufactured by Analog Devices Inc./Maxim Integrated. It utilizes DirectDrive architecture to produce ground-referenced outputs from a single supply, eliminating bulky DC-blocking capacitors. The device features an internally fixed gain of -2V/V and operates on a single 2.4V to 5.5V supply. It delivers up to 130mW per channel into a 32Ω load with low distortion. The component includes integrated click-and-pop suppression, short-circuit protection, thermal-overload protection, and ±8kV ESD protection on the outputs.

Audio Amplifiers Feature Summary

• DirectDrive Architecture: Eliminates large DC-blocking output capacitors by generating an internal negative supply for ground-referenced outputs.
• Fixed Gain Configuration: Features an internally set voltage gain of -2V/V, removing the need for external gain-setting resistors.
• Integrated Protection: Includes comprehensive click-and-pop suppression, short-circuit protection, and thermal-overload protection.
• Low Power Shutdown: Offers a shutdown mode that reduces supply current to 0.1µA while maintaining high power-supply rejection ratio.

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify the specific suffix 'TG29' against official manufacturer documentation to confirm tape-and-reel packaging and lot traceability details. Ensure the ordering part number matches the exact package type (Thin QFN) and temperature range specifications required for your design. Cross-reference the datasheet revision date to confirm all electrical characteristics align with your system requirements.

Audio Amplifiers Selection Notes

Select this component when board space is limited and the elimination of large output coupling capacitors is desired. Choose the MAX9722B variant specifically if a fixed gain of -2V/V is sufficient, as it simplifies the external circuit by removing the need for precision external feedback resistors used in the adjustable MAX9722A version.

Audio Amplifiers Part Context

This device belongs to the MAX9722 family of 5V stereo headphone amplifiers designed for portable electronics. It shares the core DirectDrive technology and protection features with the MAX9722A but differs in its fixed internal gain configuration. The family is optimized for applications requiring high audio quality in compact form factors without the cost and size penalties of traditional driver-biasing schemes.

Audio Amplifiers Replacement Considerations

The MAX9722AETE+ serves as a functional alternative within the same family, offering adjustable gain via external resistors instead of the fixed -2V/V gain found in the MAX9722B. Both devices share identical pinouts, packages, and general protection features, allowing for potential substitution if gain flexibility is required.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the design?

It eliminates the need for large DC-blocking capacitors by using a charge pump to create an internal negative supply, resulting in ground-referenced outputs. This saves board space, reduces component height, and improves low-frequency response.

What is the difference between the MAX9722A and MAX9722B?

The primary difference is the gain setting. The MAX9722B has a fixed internal gain of -2V/V, whereas the MAX9722A allows for adjustable gain through external resistors.

Does the device include protection against audible transients?

Yes, the MAX9722B includes comprehensive click-and-pop suppression circuitry that eliminates audible clicks and pops during startup and shutdown sequences.