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这图上已经说明了, ADCOUT 是差分输入端的实际输入电压
ads1293是差分输入，vinp和Vinm分别是差分放大器正极端和负极端的输入，如下图所示。ADC输入时模拟信号，也就是电压vinp和电压vinm，输出才是数字信号的。
