[time-nuts] VCXO help

[EWKehren at aol.com]

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.
 
 
In a message dated 2/25/2011 7:17:42 A.M. Eastern Standard Time,  
tijddingen at yahoo.com writes:

Hello  Bert,

That rationale sounds suspiciously familiar. The quest for an  ever simpler 
VCO,
that is. At the expense of some additional phase noise  compared to 
VCXO+PLL, you
could use an ADF4360-9. It is readily available  at for example digikey, 
currently 
for $6.26.

For my fpga based  counter project I had pretty much the same thing as what
(I think) you are  doing. Simplify it wherever possible... So first use a  
PLL with  integrated VCO, and see if the phase noise/jitter is not the  
limiting
factor to your performance. If it turns out to be limiting, you  can always 
do 
the more complicated VCXO + PLL + loop filter  later.

Anyway, that ADF4360-9 suggestion is working under the  assumption that you
are feeding it something like a 5 or 10 MHz reference  signal. And it also 
assumes you don't mind QFN packages. You know, the  little buggers with 0.5
mm pitch and no  pins.

regards,
Fred



"Bert Kehren" wrote:
> As  part of the D/M project the counter uses a 100 MHz VCO with an AD 
4001   
> PLL. To simplify further I would like to consider a very simple VCXO,  
easily 
> available components, no tuning, any ideas out there. For once  phase 
noise 
> is of  no concern.




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