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ADF4159 REFIN level

Question asked by NikosS on Feb 18, 2015
Latest reply on Feb 18, 2015 by NikosS

Hi,

I plan to use the ADF4159 for a synthesizer and i want to feed the REFIN with a 40MHz TCXO that gives a 3.3V LVCMOS output...

In the datasheet of the ADF4159 it seems that the REFIN input needs a 1.8V CMOS input... However in the corresponding evaluation board (EV-ADF4159EB1Z) where a 3.3V LVCMOS TCXO is used, it appears to be connected directly to the REFIN although this would violate the specifications for the REFIN input.

My question is, would I need a level translator from 3.3V to 1.8V to drive the REFIN with my 40MHz TCXO?

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