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F28069的ADC采样值问题



使用F28069的ADC采样,ADC使用EPWM的时间触发,对下图的电平进行采样。

3000个连续ADC采样值如下图:

ADC采样值分布在三个数据带上,而且每个带之间的间隔为14个点,为什么会出现这种情况?

我们将改变采样的电压值,采样值的幅值会变化,但也是分为几个数据带。