MAX9718DEUB+

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MAX9718DEUB+ is a low-power stereo audio amplifier designed for portable applications such as headphone and hands-free speakerphone systems. It features two separate amplifiers, each capable of delivering up to 0.15W of power into 16Ω, 32Ω, or 64Ω loads. The MAX9718DEUB+ offers a 1.6V to 10V wide supply voltage range and can operate from a single lithium-ion cell. It integrates an ultra-low-power standby mode which allows nearly instant-on performance when called upon.

The MAX9718DEUB+ is a stereo audio amplifier with high-fidelity performance based on DirectDrive architecture. It employs an inverted load topology to cancel the output offset voltage of the amplifiers for improved THD+N performance. The MAX9718DEUB+ provides 7.8Vp-p differential output into a 16Ω load from a 3V supply. It includes an on-chip power-on reset circuit, over-temperature protection, short-circuit protection, and output short-capability protections.

The MAX9718DEUB+ has several applications, including headphone and hands-free speakerphone systems, portable audio players, digital cameras, and Bluetooth audio receiver systems. It also makes a great complement to portable audio/video codecs such as the MAX9718, MAX9719, MAX9720, MAX9722, and MAX9723.

The MAX9718DEUB+ is designed to operate with Class AB output stages driven into a load by current mirrors. This topology requires precise control of the loop gain for linear operation and optimum performance. Such a control loop is composed of the amplifier’s open-loop gain and the closed-loop gain which is defined by the device outputs and the feedback network. The loop gain of the amplifier is supplemented by an external compensation network connected to the VDD1 and VDD2 pins.

The MAX9718DEUB+ works with a single power supply and requires no external components. It supports full-scale audio signals without distortion due to the DirectDrive architecture and integrates a soft-start circuit to avoid in-rush currents during startup. The MAX9718DEUB+ also features a pop-free mute function, which can be used to mute the audio amplifier to reduce power consumption.

The MAX9718DEUB+ is a stereo audio amplifier featureing high-fidelity performance with low power consumption, while providing protections such as over-temperature protection, short-circuit protection, and output short-capability protection. It can deliver up to 0.15W of power into 16Ω, 32Ω, or 64Ω loads, making it an ideal solution for portable applications such as headphone and hands-free speakerphone systems, portable audio players, digital cameras, and Bluetooth audio receiver systems.

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