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28377s AD采样 交流信号奇怪,直流正常



将AD采样的结果存放在一个数组里,用CCS观察其波形,如图所示,50Hz的正弦信号采出来是一个个脉冲似的,用示波器查了AD输入引脚的信号,正常。控制板用的是开发板LAUNCHXL-F28377S。

请问这种情况可能什么导致的呢?谢谢。