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AD噪声解释

Other Parts Discussed in Thread: ADS1254

在看一款ADS1254 AD芯片,其中DATASHEET上面对AD的噪声描述是:

LOW NOISE:1.8ppm

想问一下,噪声的单位一般是写uV或者nV,这个写是ppm,这个怎么解释,怎样把ppm转换成为uV或者nV?