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关于28377D的AD差分采样问题

问题1:

芯片介绍上面写着16位精度时,有12路通道,但是必须采用差分采样,这样最多不是只有8路通道吗?

问题2:

手册上面写着差分采样的两个输入端口为ADCINXP-ADCINXN,但是引脚图上只有CMPINXP-CMPINXN,这是一个意思吗?

问题3:

差分采样的5通道只有P通道,如何做到差分采样