MAX9759ETE+

Audio Amplifiers Overview

The MAX9759ETE+ is a mono Class D audio power amplifier from Analog Devices/Maxim Integrated, housed in a 16-pin TQFN package. It delivers up to 3.2W of continuous output power into a 4Ω load with greater than 90% efficiency. The device operates on a single supply voltage ranging from 3V to 5.5V and consumes 8.4mA of quiescent current. Key electrical specifications include a total harmonic distortion plus noise (THD+N) of 0.02%, a power-supply rejection ratio (PSRR) of 81dB at 1kHz, and a signal-to-noise ratio exceeding 90dB. It features integrated click-and-pop suppression, short-circuit protection, and thermal-overload protection.

Audio Amplifiers Feature Summary

• Filterless operation utilizing low-EMI modulation schemes that eliminate the need for external LC filters while meeting FCC radiated emission standards.
• Dual modulation modes including fixed-frequency modulation and spread-spectrum modulation to optimize EMI performance.
• External clock synchronization capability allowing multiple amplifiers to be cascaded and frequency locked via SYNC input and SYNC_OUT output.
• Pin-selectable gain settings providing four distinct options: 6dB, 12dB, 18dB, and 24dB.

Audio Amplifiers Applications

• Cell Phones/PDAs
• Notebook PCs
• Portable DVD Players
• Flat-Panel PC Monitors
• LCD TVs

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm pin compatibility and package variations. Ensure the selected variant matches the required operating temperature range and packaging format for your assembly process. Cross-reference the component marking code with the datasheet to authenticate the source and prevent counterfeit components during procurement.

Audio Amplifiers Selection Notes

Select this component for designs requiring high-efficiency audio amplification without the board space penalty of output filters. Consider the external synchronization pins if system-wide clock alignment is necessary to minimize intermodulation interference. Evaluate the pin-selectable gain options to match the input signal levels of your specific application without requiring additional analog gain stages.

Audio Amplifiers Part Context

This component belongs to the MAX9759 series of filterless Class D audio amplifiers. It is designed to provide Class AB audio performance with the efficiency benefits of Class D technology. The series supports single-supply operation and includes comprehensive protection features such as thermal shutdown and short-circuit protection, making it suitable for battery-powered portable electronics.

Audio Amplifiers Replacement Considerations

Direct replacement part numbers are not explicitly confirmed in the provided source material. Verify functional equivalence by comparing pin configurations, electrical characteristics, and package dimensions with alternative Class D mono amplifiers from the same manufacturer family before implementation.

Audio Amplifiers FAQ

How does the MAX9759 achieve filterless operation?

It utilizes a unique modulation scheme that eliminates the need for an external LC filter. The device relies on the inherent inductance of the speaker coil and the natural filtering of the human ear to recover the audio component.

What is the purpose of the SYNC and SYNC_OUT pins?

These pins allow the internal oscillator to be synchronized to an external clock or to other cascaded MAX9759 amplifiers. This minimizes interference due to clock intermodulation and allows allocation of spectral components to insensitive frequency bands.