MAX9761ETI+T

Audio Amplifiers Overview

The MAX9761ETI+T is a stereo audio power amplifier from the MAX9760–MAX9763 family, manufactured by Analog Devices Inc./Maxim Integrated. It integrates a 3W bridge-tied load (BTL) speaker amplifier and a 200mW single-ended headphone amplifier within a single 28-pin thin QFN package (5mm x 5mm x 0.8mm). The device operates on a single 4.5V to 5.5V supply and features an industry-leading 100dB PSRR at 1kHz. It delivers up to 3W into a 3Ω load with less than 1% THD+N in speaker mode, and 200mW into a 16Ω load in headphone mode. Key electrical parameters include a quiescent current of 13mA, shutdown current of 10µA, and total harmonic distortion plus noise as low as 0.002%.

Audio Amplifiers Feature Summary

• Integrates stereo BTL speaker amplifiers and single-ended headphone amplifiers with automatic headphone sensing.
• Features ultra-low 0.002% THD+N and industry-leading 100dB PSRR for clean audio performance without linear regulators.
• Includes comprehensive click-and-pop suppression and a 2:1 input multiplexer for flexible source selection.
• Operates with low 13mA quiescent current and a 10µA shutdown mode to extend battery life.

Audio Amplifiers Applications

• Notebooks
• Portable DVD Players
• Tablet PCs
• PC Audio Peripherals
• Camcorders

Audio Amplifiers Procurement Notes

Verify the specific suffix ETI+T corresponds to the 28-pin Thin QFN-EP package and -40°C to +85°C temperature range. Confirm that the MAX9761 variant utilizes parallel logic inputs rather than the I2C interface found in other family members. Ensure compatibility with the required 4.5V to 5.5V single supply voltage during component sourcing.

Audio Amplifiers Selection Notes

Select the MAX9761ETI+T when parallel digital control is preferred over serial interfaces. This model uses dedicated logic pins for mute, shutdown, gain selection, and input switching. It is suitable for designs requiring integrated headphone detection and dual-mode amplification in a compact footprint. Verify that the application does not require I2C programmability, which is reserved for the MAX9760/MAX9762 variants.

Audio Amplifiers Part Context

The MAX9761ETI+T belongs to the MAX9760–MAX9763 family of stereo 3W audio power amplifiers. These devices combine high-power speaker drive with headphone output capabilities. The family differentiates models primarily by their control interface; the MAX9761 specifically employs a parallel logic interface for configuration, distinguishing it from the I2C-controlled counterparts.

Audio Amplifiers Replacement Considerations

MAX9760ETI+T requires I2C interface adaptation. MAX9762ETI+T requires I2C interface adaptation and supports mono speaker mode. MAX9763ETI+T requires I2C interface adaptation and supports mono speaker mode.

Audio Amplifiers FAQ

How does the MAX9761 handle headphone detection?

The device features a Headphone Sense (HPS) input. A voltage greater than 0.9 x VDD configures the device for headphone mode, while a voltage below 0.7 x VDD sets it to speaker mode.

What is the control interface for the MAX9761?

The MAX9761 uses a parallel logic interface controlled by five inputs: MUTE, SHDN, HPS_EN, GAIN A/B, and IN 1/2.

Does the MAX9761 support input multiplexing?

Yes, each amplifier channel includes a 2:1 input multiplexer, allowing selection between two audio sources via the IN 1/2 pin.