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ADS1258采集交流信号问题

Other Parts Discussed in Thread: ADS1258

ADS1258采集直流信号的时候 ,输入的直流信号是多少采集计算得到的就是多少

但是采集交流信号的时候,如±500mv的正弦信号采集得到的信号是±100mv正弦信号,这是什么情况?