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TMS320F28021: AD口采样值后面两位数一直在变化,甚有的时候甚至差值超过100,这怎么解决?谢谢!

Part Number: TMS320F28021
Other Parts Discussed in Thread: C2000WARE

AD口在B3发现采样值后面两位数一直在跳,差别大的时候超过100了,这是怎么回事?AD采样怎么才能排除误差?需要做哪些措施减小误差?谢谢!