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ADC12D1000 Jitter计算问题

Other Parts Discussed in Thread: ADC12D1000

Hi

根据器件ADC12D1000手册第54页的公式,为了不降低AD性能,总Jitter应小于
tj = ( Vinfsr / Vinpp ) x (1/(2^(n+1) xpi x fin ))
当被采样信号为800MHz幅度接近满量程时,算得tjmax约为0.05ps。
是这样的吗?
那么为什么我看到ADC12D1000自己的Aperture Jitter就高达0.2ps呢?已经4倍于0.05ps这个之前计算出的最大值了。