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使用ADS1247时模拟电源的问题

Other Parts Discussed in Thread: ADS1247

这是设计的ADC电路,但是有一块电路板有这个问题,我把14脚AVDD悬空,但是用示波器测量发现这个引脚有电压,这是什么原因造成的呢?电路方面肯定是没问题的,几十块电路板就这一块出了这个问题。