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Reference Buffer for Driving Two ADF4108 PLLs

Question asked by JCJ on Jul 7, 2011
Latest reply on Jul 8, 2011 by aharney

I am operating two ADF4108 PLLs in one assembly from a common 50 MHz reference. I am looking for a buffer to provide isolation between the two PLLs. The PLLs are both fixed frequency but with different detector frequencies. One is set for 7.5 GHz with a reference of 16.7 MHz (R=3) and the other is 4.625 GHz with a reference of 25 MHz (R=2). The original 50 MHz reference is from an AD9517 (LVDS or CMOS output) in a separate assembly and is provided via a coaxial cable.

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