[time-nuts] VCXO help
EWKehren at aol.com
EWKehren at aol.com
Fri Feb 25 15:01:31 UTC 2011
I need to multiply by 10 and 20, 670-2 can not multiply by 20. Thanks.
Bert
In a message dated 2/25/2011 8:03:55 A.M. Eastern Standard Time,
tijddingen at yahoo.com writes:
Well, I know Geraldo Lino de Campos on this list is using an ICS670-03 for
this purpose. For me personally that part is too jittery by about a
decade,
but for your purpose it might just be the right compromise. Certainly has a
friendlier package.
datasheet:
http://www.idt.com/products/getDoc.cfm?docID=18461996
Slight detour about soldering QFN's for prototyping. It is not /that/ bad.
I will admit that when given the choice between QFNs and TSOPs I will pick
the latter, but QFNs are do-able. All it takes is patience and a Can-Do
attitude. Well, mainly patience really. ;) You can do those QFNs for
example
dead bug style on a solid copperclad ground plane. The trick then is to
use
aluminum foil to cover the pads you already soldered, and fluxfluxflux.
You can put the decoupling caps real close in a sort of stonehenge around
it.
Like I said, requires a bit of patience, but it's fun when it actually
works,
plus you get better at it pretty fast. :)
regards,
Fred
"Bert Kehren" wrote:
> Thanks for the info Fred
> The problem is the package. Looking at the Cirrus Logic CS 2300-CP and
use
> a bubbler. Since I start out with 5 or 10 MHz there must be something
out
> there that can be soldered.
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