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为了更及时的回复您的问题，我在E2E论坛咨询了美国的工程师，他们给了以下回复：
AFE是基于ADC的，因此，采样率取决于外部时钟。AFE中没有内置时钟源。
我们对ADC时钟频率有限制，从5MSPS到80MSPS。
（AFE is based on the ADC. thus the sample rate depends on the external clock. there is no build in clock source in the AFE.
we do have the limits on the ADC clck freq from 5MSPS to 80MSPS. ）
