The AD9914 REV.B datasheet had said to handle 4GHz frequency clock. Why this amount is reduced to 3.5 GHz?
My application is single tone with the best phase noise and SFDR. I have an ultra low phase noise 1GHz OCXO. Obviously, it is easier to make 4 GHz signal than 3.5 GHz. If I drive the Ad9914’s REF_CLK input at 4GHz, what will be happened?