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ADS1246采样的问题

Other Parts Discussed in Thread: ADS1246

我用ADS1246采样信号,ADS1246采样频率为20SPS,精度用到16位,现在是我采样MV信号和PT100信号,MV信号和PT100信号我都外部放大10倍到1V左右,基准是1.25V,显示是采样MV信号会跳2个字,但是采样PT100信号会跳几十个字,我换了一个克AD芯片,采样出来的值就不跳,我想问下只是信号的问题,还是AD的问题