[time-nuts] GPS Locked and Unlocked Performance Comparison

[SAIDJACK at aol.com]

Hello Didier,
 
maybe you are right, and that's not easy to find. I remember an app not  from 
LT (Jim WIlliams?) that discussed how to build a high-accuracy DC output  DAC 
using a Sigma Delta ADC and some logic etc.
 
Finding a 24 bit ADC is pretty easy, ADI, TI, Linear, Maxim etc seem to  
offer these.
 
One could also build a composite DAC out of two 16 bit DAC's or two 20 bit  
DAC's etc. The voltage reference is key to good performance here, and should  
have <<3ppm tempco to get anywhere near the 24 bits of accuracy.
 
bye,
Said
 
 
In a message dated 2/14/2008 02:02:36 Pacific Standard Time, didier at cox.net  
writes:

What 24  bit DAC do you have in mind?

I have been looking for a standalone 24  bit DAC in a small package and have
not found anything I liked  :-(





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