[time-nuts] Si5340 synthesizer chip performance

John Ackermann N8UR jra at febo.com
Sun Jan 28 19:23:51 EST 2018

I received the Si5340A evaluation board from Digikey on Friday and fired 
it up yesterday.  I used the SiLabs "ClockBuilder" software to configure 
four outputs -- 10 MHz, 15 MHz, 29.999 999 9 MHz, and 144.2 MHz -- all 
using the 45 MHz crystal that comes with the EVM.  Attached is a phase 
noise plot of the 10 MHz and 29.999 999 9 MHz signals.  I would say this 
isn't too bad!  This performance is certainly sufficient for any of the 
RF work I have in mind.

The ADEV was another matter -- about 1e-9 at 1 second, working its way 
uphill from there.  But what do you expect from a bare crystal?


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