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为什么要用到2个ADC端口呢?
这张图的意思就是250mv的信号放大到2V的信号示意图,至于2.55V与1.29V只是显示其直流偏置电压(即输出共模电压)不同而已。
你可以再加入一级差分转单端输出,然后送入ADC。