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PCM1681-Q1: 输出低通滤波电路

Part Number: PCM1681-Q1

Hi all:

     我才用规格书给出的低通滤波电路。

实测效果不好,我采样率只用了8K。  请问我应该怎么设计这个低通滤波电路。  有没有文章讲这个怎么计算。