[time-nuts] Fury Interface Board: 5MHz needed?
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed Nov 7 15:26:24 EST 2007
In a message dated 11/7/2007 11:24:39 Pacific Standard Time,
hmurray at megapathdsl.net writes:
>My first guess is that it's a backwards compatibility mess. Ages ago
>somebody made a part with a single ground pin and somebody used it in some
>telco gear and everybody has been using the same footprint ever since. If
>that's the case, I'd expect there would also be a variation with a second
>ground pin to get better performance.
>How much better would their part be if they had a second ground pin?
>Are they running temperature tests with the EFC pin open so they don't see
>any problem as the heater current changes? (or something like that)
Yup, it's a legacy issue I think.
There are folks out there that know about this, I believe the HP Oscillators
have separate grounds for this reason.
It's all about cost and compatibility. At the time they developed these
packages, one was probably lucky to get 1E-07 to 1E-08 stability out of them.
Nowadays we are trying to get parts in the E-012 out of them - totally
different ballgame.
bye,
Said
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