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AM3354有8路12位的ADC，输入电压范围为0-1.8V，如果用这个AD去采集电压，精度能达到多少？
ADC的精度可以参考DNL, INL这两个参数。http://www.ti.com/lit/ds/symlink/am3354.pdf
从这两个参数判断不出来，有没有实测过
