[time-nuts] PLL suggestions

[paul swed]

Dan there are numbers of small PLL chips that should work well and are
really reasonable to use. Its just unclear to me if they will hit the lower
noise performance you may need. I am thinking of the Silicon Labs family
but analog devices and others have very nice chips these days also. Good
luck
Paul.

On Tue, Dec 31, 2019 at 11:15 AM Dan Kemppainen <dan at irtelemetrics.com>
wrote:

> Hi All,
>
> We've got a project going on where we need a 125MHz clock that should be
> locked to 10MHz. I'm considering an on board 10MHz oscillator and
> external 10MHz input to utilize an external standard to lock the 125MHz
> which would PLL a 125MHz source.
>
> The 125MHz becomes a reference for 3.125Ghz, as well as logic running at
> 125Mhz. (Currently this system is running on small 125MHz TCXO.)
> Basically we need a reasonably clean 125MHz signal, but locked to 10Mhz
> for frequency reference.
>
> We've identified a few VCXO's that seem to be low noise and are small
> enough. The 10Mhz is easy enough. However my stumbling block is a simple
> PLL.
>
> What I'm looking for is a simple, small PLL chip. Something with
> external analog loop filter components to allow easy tweaking would be
> preferred.
>
> In my perfect world, this chip would be a COTS part, with pin strappable
> divider configuration or similarly simple hardware configuration. An OTP
> device would work as well, as would one with it's own memory and
> external programmer. If necessary a small PIC or similar could be used
> to configure the PLL, but that's one chip which would be nice to avoid.
>
> Smaller compact package SMT parts are fine. This is going on a board
> with lots of SMT components, leadless flat pack devices and BGA's, so
> smaller is better.
>
> If any of you have any suggestions, I'd appreciate it.
>
> Happy new year!
> Dan
>
>
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