RK817/RK809 内置 codec 是高性能音频编解码器： High performance Audio CODEC  One internal PLL  Support microphone input  Support I2S as the digital signal interface for both DAC and ADC  Support Automatic Level Control(ALC),limiter and noise gating  Support programmable digital and analog gains  Audio resolution from 16bits to 32bits  Sample rate up to 192KHz  Provides master and slave work mode, software configurable  Support 3 I2S formats (normal, left-justified, right-justified)  Support PDM mode(external input PCLK)

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