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ADS131M04EVM: 用开发板采集的数据有些奇怪

Part Number: ADS131M04EVM

详情见如下图,板子是ads131m04EVM开发板,采用16k采样率,采集信号发生器生成的频率为4000的正弦波。

点数较少时还行,但是采集点数较多(图中为262144点)时,可以明显看出来波形有问题。