MAX97000 具有单声道D类扬声器放大器和H类耳机放大器的音频子系统   概述 The MAX97000 audio subsystem combines a mono speaker amplifier with a stereo headphone amplifier and an analog DPST switch. The headphone and speaker amplifiers have independent volume control and on/off control. The 4 inputs are configurable as 2 differential inputs or 4 single-ended inputs.

The entire subsystem is designed for maximum efficiency. The high-efficiency 725mW Class D speaker amplifier operates directly from the battery and consumes no more than 1µA in shutdown mode. The Class H headphone amplifier utilizes a dual mode charge pump to maximize efficiency while outputting a ground referenced signal that does not require output coupling capacitors.

The speaker amplifier incorporates a distortion limiter to automatically reduce the volume level when excessive clipping occurs. This allows high gain for low-levels signals without compromising the quality of large signals.

All control is performed using the 2-wire, I²C interface. The MAX97000 operate in the extended -40°C to +85°C temperature range, and is available in the 2mm x 2mm, 25-bump WLP package (0.4mm pitch).   关键特性

2.7V to 5.5V Single Supply Voltage
	725mW Speaker Output (VPVDD = 3.7V, ZSPK = 8Ω + 68µH)
	40mW/Channel Headphone Output (RHP = 16Ω)
	Low-Emission Class D Amplifier
	Efficient Class H Headphone Amplifier
	Ground Referenced Headphone Outputs
	2 Stereo Single-Ended/Mono Differential Inputs
	Integrated Distortion Limiter (Speaker Outputs)
	Integrated DPST Analog Switch
	No Clicks and Pops
	TDMA Noise Free
	2mm x 2mm, 25-Bump 0.4mm Pitch WLP Package

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 便携式多媒体播放器