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AD9915 SDIO response time problem

Question asked by iselha on Dec 24, 2014
Latest reply on Jan 6, 2015 by LouijieC

I tried different sclk frequencies in serial mode spi writing op.

Datasheet says, it works properly in max 80 MHz sclk. USB controls are disabled, I communicate by triple row headers.

When I set sclk 20 MHz, response as following pic;



when sclk is 5 MHz;



The question is that when we accept 80 MHz expression, why response time of AD9915  is so slow?  Do you have any comments or opinion?