Bert, first of all I'm really happy you're digging into this -- it's
been on my list of "projects for someday" for a long time!
One thing working in your favor is that the actual BFO frequency is way
down at audio; the BFO crystals at around 2 MHz are divided by 1000
before hitting the mixer. So that gives you 40dB of help on the phase
noise, as well as reducing any frequency offset that DDS step size might
impose.
John
----
Tijd Dingen said the following on 02/25/2011 08:02 AM:
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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