Maxim MAX97001单片音频系统解决方案

Maxim公司的MAX97001是单声道音频子系统,包括单声道扬声器放大器,立体声耳机放大器和模拟DPST开关. 扬声器和立体声耳机放大器是单独音量控制,4个输入可配置成两个差分输入或4个单端输入.2.7V-5.5V扬声器电源,输出700mW,1.6V-2V耳机电源,每路输出37mW.主要用在手机和PMP.本文介绍MAX97001主要特性, 功能方框图与应用框图,MAX97001评估板主要特性,电路图和材料清单(BOM).

The MAX97001 mono 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, 700mW, 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-level signals without compromising the quality of large signals.
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