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Maxim MAX98357A PCM输入D类音频放大器解决方案
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The MAX98357A/MAX98357B are digital pulse-code modulation （PCM） input Class D power amplifiers that provide Class AB audio performance with Class D efficiency. These ICs offer five selectable gain settings （3dB， 6dB， 9dB， 12dB， and 15dB） in I2S/left-justified mode set by a single gain select input and a fixed 12dB gain in TDM mode.
The digital audio interface is highly flexible with the MAX98357A supporting I2S data and the MAX98357B supporting left-justified data. Both ICs support 8 channel time division multiplexed （TDM） data. The digital audio interface accepts specified sample rates between 8kHz and 96kHz for all supported data formats. The ICs can be configured to produce a left channel， right channel， or （left/2 + right/2） output from the stereo input data. The ICs operate using 16/24/32-bit data for I2S and left-justified modes as well as 16-bit or 32-bit data using TDM mode. The ICs eliminate the need for the external MCLK signal that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count of the ICs.
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