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24位补码采样的问题



24位ad采样得到补码得到011111111101100100011111,这个采样是不是一看就不对,因为010000000000000000000000对应于8388608,110000000000000000000000对应于-8388608,但我给300mv差分输入得到的确是这个值,什么问题啊!