MAX9750AETI+

Series:	DirectDrive®
Packaging:	Tube
Part Status:	Obsolete
Type:	Class AB
Output Type:	2-Channel (Stereo) with Stereo Headphones
Max Output Power x Channels @ Load:	2.6W x 2 @ 3 Ohm; 110mW x 2 @ 16 Ohm
Voltage - Supply:	4.5 V ~ 5.5 V
Features:	Depop, Short-Circuit and Thermal Protection, Shutdown, Volume Control
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	28-TQFN (5x5)
Package / Case:	28-WFQFN Exposed Pad
Base Part Number:	MAX9750

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MAX9750AETI+ Application Field and Working Principle

The MAX9750AETI+ is a highly integrated self-powered speaker driver with Class D output and integrated audio amplifier, basically for applications such as portable and outdoor speakers. It is a great choice for audio systems because of its high-performance, low power consumption ratio and high-level integration.

Powering and Signaling

The MAX9750AETI+ is powered by a 5V DC single-supply, eliminating the need for an alternating current (AC) supply. The output of the MAX9750AETI+ ranges from 3-24V, making it suitable for both portable and outdoor sound systems. The amplifier also features a direct-current (DC) bias voltage of either 1.00V, 1.58V or 2.02V depending on the user application, as well as a -1.00V common mode offset. This allows the driver to reach a maximum power output of 8W, depending on the configuration.

Input Interface

The MAX9750AETI+ utilizes a balanced three-pin port for connecting external audio sources. This port supports both single‑ended and differential input configurations. This allows for the efficient transfer of both low and high-resolution audio signals. The MAX9750AETI+ also supports up to 8-kHz bandwidth, which enables a variety of high-quality audio experiences.

Amplifier Structure

The MAX9750AETI+ features integrated Class D audio output amplifiers. It consists of two complementary power amplifiers, each employing both P and N-channel power MOSFETs of equal size. This ensures the amplification process is precise, with minimal distortion at low power levels. This enables improved sound quality, a higher fidelity and better overall audio performance.

Clipping and Protection

To minimize the risk of audio output distortion, the MAX9750AETI+ is equipped with an adjustable clipping detector. This unit monitors the signal to detect excessive signal levels, whilst protecting the amplifier from overload or short‑circuit. This allows for clean and clear audio outputs, even at high signal levels. Additionally, the MAX9750AETI+ also features a signal-loss detection, which can be configured to detect and alert any signal-loss.

Conclusion

The MAX9750AETI+ is a highly integrated self-powered speaker driver with Class D output and integrated audio amplifier, specifically designed for audio systems. It is powered by a 5V DC single-supply and can support up to 8-kHz bandwidth with differential input configurations. The amplifiers also feature an adjustable clipping detector to reduce audio output distortion and a signal loss detection feature to detect signals loss. All these features combine to provide improved sound quality and audio performance.

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