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ads8332的模拟输入端口的运放选择

Other Parts Discussed in Thread: ADS8332

ads8332的datasheet中讲到如在运放于ad的输入端没有设置rc滤波器,则运放的带宽必须大于((n+1)*ln(2))/(2*pi*t),其中n为ad位数,t为ad的最小采样时间。请问这个带宽最小公式是如何推到出来的。谢谢。下图为datasheet截图。