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28335内部ADC-A2通道采样突变

项目中使用28335采集电网线电压Uab,Ubc,Uca,采样频率16K,分别使用28335的内部ADC-A7,ADC-A6,ADC-A2,实际过程中发现ADC-A2通道采样值会有突变(采样瞬时值为4096),当时是江ADC-A2的采样瞬时值通过DA输出到示波器,同时用示波器检测ADC-A2的输入,结果为ADC-A2输入正常,ADC-A2采样瞬时值有突变,因为我们项目对每个采样点采样值要求都很高,有一个突变就会导致装置故障,求大神帮忙看看,分析分析,给个路子;