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AD9912 Evaluation board SYSCLK


I'm driving my AD9912 evaluation board with an AD9520-4 evaluation board as SYSCLK. It seems to be working mostly fine, but I'm wondering whether there is a particular correct way to interface LVPECL to the SYSCLK input of the AD9912 board. Since I'm using only one of the LVPECL ends, the voltage swing is okay, but I still feel there ought to be a "correct way" to do this.

Thanks for any insight on this.