[time-nuts] SiT5155 GNSS/GPS VCTCXO modules

[Bob kb8tq]

Hi

I’m certainly not trying to say that this is a bum part. If the ADEV on similar 
SiTime parts *does* apply ( who knows at this point …) it certainly beats a 
typical TCXO on ADEV. People most certainly make working GPSDO’s based
on TCXO’s. 

The plot shown for the similar parts is not quite as good as the ADEV on the 
OCXO’s in the “typical” GPSDO's that we all have been gobbling up and chatting 
about here on the list for the last 15 year or so. (yes it has been that long …). There 
have been a lot of them and I’m sure a few have better or worse OCXO’s than the 
bulk of them. We all seem to love playing with theses GPSDO's to make them even 
better than when they left the factory. To some degree, the OCXO is the limit
we bump up against. 

What would worry me the most on the plot that the link goes to is the rise past
100 seconds. That’s probably going to be a bit of a struggle to tame …. The result
would be a bit “faster” loop that lets a bit more of the GPS noise through. 

Bob

> On Dec 19, 2018, at 2:16 PM, Achim Gratz <Stromeko at nexgo.de> wrote:
> 
> Bob kb8tq writes:
>> It would be nice to see an ADEV plot if indeed GPSDO use is a target market.
> 
> The common datasheet for this part only seems to tabulate the phase
> noise specs, but the SiT5356 datasheet has actual ADEV/TDEV plots.  For
> both series there are companion documents for the more common
> configurations that have more/extended plots including ADEV/TDEV.  I
> seem to remember a whitepaper that had some more information, but I
> can't find it now.  But here's a recent blog post that links to more
> documents, some of which seem to be new:
> 
> https://www.sitime.com/company/news/blog/more-robust-stratum-3e-ocxo
> 
> 
> Regards,
> Achim.
> -- 
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