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ADS1281 的SINC 滤波器 GROUP DELAY

Other Parts Discussed in Thread: ADS1281

你好, 

       我在ADS1281的DATASHEET中看到FIR的GROUP DELAY 在线性情况下是30*1/fdata.

       如果 我只有SINC,不用FIR,这时候的GROUP DELAY 滤波器延时是多少,应该在哪看了?