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ADS1282与ADS1675,有效位数问题???

Other Parts Discussed in Thread: ADS1282, ADS1675

31位的1282有效位数也就21位左右,剩余的10位全是噪声,这样的话24位的1675岂不已经够用了,为什么要设计1282这款呢,有什么特别的吗??

我们现在正在做一款物探仪器,因为是要从大地里面采集信号,所以信号非常微弱,就希望支持大的动态范围,采样位数高,但是发现31位和24位没什么区别啊,反正有效位数就那些,低几位全是噪声了,相当迷惑,请教,着急,谢谢!!!