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ADS1115 没有信号输入情况下,会采集到负电压

Other Parts Discussed in Thread: OPA2335, ADS1115

最近做ADS1115采样,输入信号为4~20ma,前级采用opa2335做电压跟随器。

现在出现的问题:刚上电,通道0没有信号输入,通道1有信号输入,此时一切正常。当通道0有信号输入后,之后再断开,通道1仍继续输入信号,但通道0会采集到负电压。这是什么原因?  信号接入时,采集信号正常。

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