[time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

Pete Lancashire pete at petelancashire.com
Sat Mar 1 13:05:23 EST 2014

Idea. On the next go around for the board put the copper down and holes for
a couple small daughter cards and any support logic needed to interface
with the BBB.
The the only additional cost would be limited to the daughter board I/O
since my guess it would be SMT hence a bit hard to leave it unpopulated.


On Sat, Mar 1, 2014 at 9:39 AM, John Seamons <jks at jks.com> wrote:

> On Mar 2, 2014, at 6:20 AM, Brian Lloyd <brian at lloyd.com> wrote:
> > Instead of using the external reference input, any thoughts on actually
> > disciplining the internal OCXO to bypass the problem?
> I almost put a GPS front-end chip and small FPGA on the 5370 board. You
> can imagine where that idea was going. I mean, you've got that whole
> BeagleBone just sitting there with some spare cycles now that I use the
> PRU. But it would have doubled the BOM cost. Probably more depending on the
> choice of DAC solution.
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