MAX9728AETC+

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MAX9728AETC+ Amplifiers - Audio

The MAX9728AETC+ is a high performance low power consumer audio amplifier designed for products such as clocks, MP3 players and other consumer devices. The device features a low quiescent current, low power consumption, low distortion, low THD and excellent sound quality. In addition, it has a low profile package, low cost, and is designed for applications with limited space and power.

Features of the MAX9728AETC+

The MAX9728AETC+ is a single-supply, audio power amplifier; it is capable of delivering up to 18W of continuous average power into an 8Ω load with less than 10% THD+N from a 5V power supply. This device also has a high input sensitivity, low output noise, and high PSRR so it can be used in portable and noise-sensitive applications. It has very low quiescent current for good power savings in battery-powered portable devices, small size, ease of use and fast turn-on time make it ideal for portable applications even in areas with limited available space.

The MAX9728AETC+ also features a stereo cross-channel feedback circuit that ensures left and right channel audio is balanced, the stereo channel gain is matched, and noise interference is minimized. In addition, it also has a thermal shut-down protection circuit, and a thermal warning circuit that can provide soft-muting or warning at a high temperature.

Working Principle

The MAX9728AETC+ is built on a highly integrated, low-power, low-cost audio amplifier chipset that includes an integrated power-management system, allowing for high performance audio playback from portable and other low-power applications. It is a class D amplifier with an analog input, a pulse-width modulation (PWM) conversion circuit to convert the analog input to a digital power signal, and a switch-mode power supply that combines a low operating voltage with low quiescent current, allowing for operation from a single 5 V power supply.

The PWM conversion circuitry enables high-efficiency power conversion and the switch-mode power supply improves efficiency by minimizing quiescent power consumption while powering the converter and the amplifier stages. This converter incorporates an analog-to-digital converter (ADC) that continuously monitors the input signal level and adjusts the output power to ensure maximum efficiency, distortion-free performance and minimal power dissipation over the full range of input levels.

The MAX9728AETC+ amplifier stages also feature a low-noise low-distortion design, combined with an advanced power-management system that ensures high performance and low power consumption. The output stage of the device is a Class-D amplifier that is optimized for low EMI and RF susceptibility. The device also incorporates a headphone amplifier, allowing the device to drive headphones for low-level monitoring.

Applications of MAX9728AETC+

The MAX9728AETC+ is designed for low-power consumer electronics applications such as portable speakers, clocks, MP3 players, head-sets, telephones and personal digital assistants (PDA\'s). The device’s small size, low power consumption and high performance make it an ideal choice for cost sensitive and portable applications. Additionally, its features make it suitable for noise sensitive applications, as well as versatile home entertainment systems.

The MAX9728AETC+ also offers a wide range of features that make it suitable for a variety of other portable audio applications. It supports a wide range of audio signals, including Bluetooth, WiFi, any musical instrument, and any other audio source that may be connected to a standard TV. In addition, the device features a headphone amplifier, allowing users to listen to high-quality audio through headphones. It has a very low noise level, making it suitable for use as a studio monitor.

The MAX9728AETC+ can also be used for car audio systems, providing output channels for both front and rear speakers. Its low power consumption allows the device to be used in automotive applications, where power savings is of the utmost importance. Finally, the device is designed to provide high-quality sound that is clear and distortion-free at all levels, making it suitable for a variety of audio applications.

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