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Design >> Analog Design >> Transformer or Common-mode choke for Ext Ref Input?
https://designers-guide.org/forum/YaBB.pl?num=1390208203

Message started by Gradient on Jan 20^th, 2014, 12:56am

Title: Transformer or Common-mode choke for Ext Ref Input?
Post by Gradient on Jan 20^th, 2014, 12:56am

Hi

I am currently working on a ultra-low noise/jitter clock source and am using TI's LMK04828 for frequency upconversion. I would like to add an external ref in- and output (10Mhz standard) for chaining and locking multiple other devices.
I was planning on using a high speed buffer (ADCLK905) to protect and boost the input stage. Now I am wondering whether it is good practice or advisable to also add a transformer (i.e. 1:2 for 50 ohms match) and/or a common mode chocke after the BNC input in front of the buffer?
Same question also applies for the output: would you put a trafo or directly provide the reference output?

Thanks for any advice