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MSP430FR5994 ADC12_B 采样问题

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Other Parts Discussed in Thread: MSP430FR5994

利用ADC12_B 采集一个外部正弦波信号,然后把数据存入SD卡,并画图,发现信号很不平整,如下图所示,这是正常毛刺还是使用不当造成的?