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TLV320AIC3104: 信噪比只有72dB,如何能达到92dB

Part Number: TLV320AIC3104

现在我们3104做一块核心板,线性差分输入到差分输出,如图是原理图和PCB:

 

用AP做音频测试,测试出来只有72dB的信噪比,采样率是22050,麻烦帮忙看一下如何做才能提高信噪比到92dB