MAX9791AETI+ Integrated Circuits (ICs)

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MAX9791AETI+ Application Field and Working Principle

The MAX9791AETI+ is a dual-channel digital audio amplifier for audio environments. It is designed for use in active speaker systems including flat-panel TVs, home theater systems, custom-install surround sound systems, Bluetooth headset reinforcement, and other audio systems. It provides high-quality, distortion-free audio output in an efficient, low-power package.

The MAX9791AETI+ comprises an output stage containing two audio amplifiers, each with differential inputs and linearly adjustable gain, operating over a wide voltage range. Each amplifier has an adjustable gain range of +12dB to -35dB, independently adjustable via a two-wire interface. The power supply range is 3.3V to 9V and the output swing is adjustable from 0V to the power supply rail. The output current up to 170mA per channel ensures a wide dynamic range, low distortion, and excellent fidelity.

Features

• Dual mono differential input amplifier
• Efficient Class D architecture
• High power-to-size ratio
• Fast switching speeds and ultra-low distortion
• Efficient EMI reduction through low-power operation
• Broad operating voltage range from 3.3V to 9V and adjustable output swing
• High output current up to 170mA per channel
• Compact form factor and low profile
• Flexible and customizable configuration
• Wide supply voltage range and flexible power control limits
• Independent input and output relays

Application Field

The MAX9791AETI+ is ideal for use in a variety of audio environments and applications, from flat-panel TVs, home theater systems and custom-install surround sound systems, to Bluetooth headset reinforcement and other audio systems. It also can be used in high-performance audio systems for mobile devices and computers, portable media players, and automotive audio systems.

For architectural acoustics, the MAX9791AETI+ is perfect for in-room wall panel enclosures and manufacturing of cylindrical and other passive loudspeaker systems. It can also be used in outdoors and interior acoustics, and for gaming systems, hi-fi systems and other portable audio devices.

Working Principle

The MAX9791AETI+ utilizes a class D audio architecture in which two audio amplifiers are driven with complimentary, or “push-pull”, signals. This type of architecture minimizes switching losses which would normally cause distortion in traditional class A/B amplifiers. The two audio amplifiers in the MAX9791AETI+ each have an adjustable gain range of +12dB to -35dB, providing greater flexibility and allowing the device to adapt to a variety of applications, achieving excellent sonic clarity and fidelity.

The MAX9791AETI+ features independent, low-impedance relays for input and output switching. This ensures quality, reliable performance for both audio in and audio out. The low power operation reduces emissions and the impact on the local environment. Since the gain of each amplifier can be adjusted independently, the device is capable of achieving superior fidelity and sound clarity even with a single amplifier.

Conclusion

The MAX9791AETI+ is a reliable and efficient solution for any audio application. It has a wide operating voltage range, high power to size ratio, efficient EMI reduction, and excellent sonic clarity and fidelity. With its robust and flexible configuration options, it can be used in a variety of applications such as flat-panel TVs, home theater systems and custom install surround sound systems, as well as outdoor and interior acoustic systems and gaming systems.

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