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ADS805对信号电压影响的问题

Other Parts Discussed in Thread: ADS805

ADS805的电路设计如图所示,现在的问题是:当ADS805不工作的时候,信号的电压是正常的;当ADS805工作的时候,信号的电压会有0.3V左右升高,而且还比较稳定。请问是什么原因造成的?ADS805工作对电源或者模拟地有影响了吗?有什么办法解决?

PS:ADS805和信号是共模拟地