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ADS8688 输入端悬空,为什么会有2V左右的电压?

Other Parts Discussed in Thread: ADS8688

如标题,原理图按照TI参考文件tidrbb9设计,输入端悬空,但是在每个通道的输入端测量,会有2V左右的电压,这个是什么原因?