[原创] Maxim MAX98358数字PDM输入D类放大器解决方案

Maxim公司的MAX98358是脉冲密度调制(PDM)数字输入D类放大器,提供AB类音频性能和D类效率,可选择增益设定(3dB, 6dB, 9dB, 12dB和15dB),单电源2.5V- 5.5V,5V时4Ω输出功率3.2W,效率92%(RL = 8Ω, POUT = 1.5W),1kHz时的THD+N为0.015%,增益为6dB时的输出噪音29μVRMS,主要用在笔记本电脑,手机,平板电脑和手持媒体播放器(PMP).本文介绍了MAX98358主要特性和简化框图,立体声工作电路图以及音频接口板AUDINT1主要特性,简化EV系统框图,电路图,材料清单和PCB设计图.

The MAX98358 is a digital pulse-density modulated (PDM) input Class D power amplifier that provides Class AB audio performance with Class D efficiency. This IC offers five selectable gain settings (3dB, 6dB, 9dB, 12dB, and 15dB) set by a single gain-select input (GAIN). The IC can be configured to produce a left channel, right channel, or (left/2 + right/2) output from the stereo input data.

The MAX98358 takes a stereo pulse density modulated (SPDM) input signal directly into the DAC. Data on the rising edge of PDM_CLK is considered left-channel data while data on the falling PDM_CLK edge is right channel. A mono sum feature is also implemented with SPDM data input by summing the data from both rising and falling clock edges.
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