[time-nuts] More on SiLabs 5340

Attila Kinali attila at kinali.ch
Tue Jan 30 15:16:41 EST 2018


On Mon, 29 Jan 2018 15:38:33 -0500
John Ackermann N8UR <jra at febo.com> wrote:

> Today I tried replacing the crystal with a 10 MHz input, and found that 
> the evaluation board requires surgery to support that.  What I was able 
> to do, though, was feed 10 MHz into the "Input 0" port which apparently 
> disciplines the free-running crystal.  I used a 10811A fed into a 
> T2-Mini with divider removed, so all it does is provide the Wenzel 
> squaring circuit.  Results attached, added to the plots from yesterday. 
> Also attached is an ADEV plot proving that the 10 MHz is in control.

There is a small detail that puzzles me: the ADEV for the internal
reference 10MHz and 30MHz bends upwards at tau greater than 0.1s.
Shouldn't that be visible by a change in slope in the phase noise
plot at ~10Hz as well?

			Attila Kinali

It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson

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