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隔离芯片的问题

Other Parts Discussed in Thread: ADS1675

想咨询一下,

设计隔离芯片由ADS1675输入,原理图的两边是没有共地的。

目前出现这种情况,当没有共地时候采集的波形是:

调试时候,我用飞线把两边地连起来就正常;

请问专家,请问是什么原因造成的。