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关于PCM3168A的疑问

现在我使用了下,差分的DA输出我只用1路DA-就行了,配合DACOM一起好像也可以使用,另一端DA+悬空貌似也可以。

但是发现,输入音频信号如果超过1Vrms后,AD的采集信号就会失真变形,而不是简单地限幅么?而且失真后需要信号恢复到0.5Vrms左右信号才会恢复正常,怎么恢复还有个迟滞的状态?