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REF3125如何测试其输出电压是精确的呢?

Other Parts Discussed in Thread: REF3125, ADS1256

    用REF3125作为ADC(ads1256)的基准电压,但是不知道输出的2.5V电压到底有多精确,请教一下如何检测它的输出?顺带问下怎么判断ADC转换后的值的精度?