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什么是ADC的采样窗口，请具体讲讲。还有它和采样频率，采样保持之间的关系。还有采样窗口大小要根据什么来设置。
采样窗口就是采样保持的时间，C2000默认最小是7个系统时钟，最大是64个系统时钟，直观一点说，采样保持器就是一个电容，给电容充电的时间长端就决定了电容电压的值，也就是外部电压的采样的精度。
