Thanks david for your reply, yes i know the purpose and i meant to say i am trying to integrate reference design of AD9467FMC in my project, and i saw different datasheet in which it is recommended to use filters. regarding "go further" i tested this reference design by connecting grounded BNC 50ohm on AIN and AMP IN, it means i should get 0000000000000000 but instead of this i am getting frequent change in 6 bits of LSB.
After that i tested some tests which are mentioned in AD9467 datasheet and that works fine as well. So i was thinking that it was because of that filter which i am not using.
I think u understand my question now.
thanks.