28379AD采样值与万用表测量值相比总会高出0.2-0.4V左右,不知道什么原因,本来想找找校准的寄存器,也没有找到,只有偏置寄存器
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这个很难判断啊。测试的时候是用例程还是其他程序?
另外,测试ADC实际值不应该用万用表测,万用表测的都是有效值,跟采样实际值不同。你可以用示波器测一下