Hi

Very few VCXO's have reference outputs. Some OCXO's have reference outputs. The 
gotcha there is the oven current. You can easily get multiple mV sort of 
changes in the  OCXO ground voltage as the oven current cycles over a fairly 
narrow range. That significantly impacts the usefulness of the reference, since 
they share a common ground.

Bob

On Sep 14, 2012, at 6:10 PM, Don Oconnor <eg...@wowway.com> wrote:

> Hello all, 
> 
> 
> 
> Most voltage controlled XOs have a voltage reference output. Is it necessary 
> for the DAC output / frequency control input, to track this voltage reference 
> output?
> 
> 
> 
> Thank You
> 
> 
> 
> Don O'Connor
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