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使用TI TMS320F28335 AD问题

Other Parts Discussed in Thread: TMS320F28335

在使用TMS320F28335芯片内置AD采样时,内部的AD是12位,但是在对外部电压信号采集之后经过比较发现,得到的精度没有12位那么精确,存在很大的误差,不知道是什么原因?