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LMH6703的输出端问题~

Other Parts Discussed in Thread: LMH6702, ADC08200

请问LMH6702的输出端为什么要接一个由22欧和10PF构成的低通滤波器呢?

这样算的话,(1/RC)=5MHZ,可是ADC08200可以200MHZ采样,带宽可达30MHZ,这样一个低通滤波器不是限制了带宽了么?