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使用的是AIC3106芯片,自环有声音,编解码以后没有声音了

使用的是AIC3106芯片,IOVDD=1.8V,在自环有声音,编解码以后没有声音了;

当 IOVDD=3.3V时,自环有声音,编解码以后也有声音

有人知道这是什么原因吗?求回复