[time-nuts] Si5340 synthesizer chip performance

Bob kb8tq kb8tq at n1k.org
Sun Jan 28 19:33:40 EST 2018


Hi

It would be *very* interesting to see what happens if you sync it up to a 10 MHz input ….

Bob

> On Jan 28, 2018, at 7:23 PM, John Ackermann N8UR <jra at febo.com> wrote:
> 
> 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?
> 
> John
> 
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