[time-nuts] yet another GPSDO design, or so
attila at kinali.ch
Tue Jun 29 18:24:15 UTC 2010
On Tue, 29 Jun 2010 14:07:17 EDT
EWKehren at aol.com wrote:
> > > just bought four AD 1861 on ebay with shipping was $11 each. Will see
> > > hat I get, but they are out there and 18 bit will cover in my opinion most
> > Any one interested should hold off for a day buying. I have contacted the
> > seller asked how many he has and what a quantity price would be. To much
> > interest and the price will go up. I think the market for audio equipment
> > replacement is shrinking and there will be more reasonable offers out there
> > for this device, because repair of the audio equipment is prohibitive
> This seller has 95 AD1861 in stock. Is there a reason why they would not
> work for all applications. No I do not get a cut. 95 would justify to do a
> new design but I am convinced there will be plenty more.
I don't think this is such a good deal. The AD5680 which seems to have
the better characteristics for a GPSDO application is available for
6.8USD/piece at digikey.
If going for an audio DAC, i'd go for a 24bit one like the AD1853
which costa about 13USD/piece at digikey.
But please note that these audio DACs are not necessarily the right
DACs for a GPSDO application. They have a high linearity, yes, but
the have quite a bit of drift and other nastynes, which is ok for
a audio application where voltage differences over time are not so
important, but differential non-linearity is very important.
Of course, time dependent non-linearities can be compensated by
a the control loop, but it will add to the phase noise.
If you want to walk fast, walk alone.
If you want to walk far, walk together.
-- African proverb
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