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cc2530采9mv以下的信号AD值是负的,大家有碰到这个情况吗?

Other Parts Discussed in Thread: CC2530

最近要用到CC2530的AD,

发现采集9MV左右的信号AD值是0,比他小的信号AD值就是负的了,输入0V时AD值是负的200多,

不知道大家有没有碰到这个问题?该如何解决?