I can only guess at what a sound card with linearity specs approaching those of the AD kit would cost, and it's still AC coupled, and as Poul pointed out, has no long term stability spec.
To me, it sounds like a no brainer, pun intended :) Alternately, my last HP3456A cost me about $50, and that's a 6 digit DVM with decent specs. You will need an HPIB controller though, if you do not already have one. Didier ------------------------ Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: jimlux <[email protected]> Sender: [email protected] Date: Sat, 26 Jun 2010 12:57:37 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] EFC tracking Didier Juges wrote: > Steve, > > You may want to check the "Analog Devices MiniKit for ADuC702x-series". > > http://www.google.com/search?q=Analog+Devices+MiniKit+for+ADuC702x-series > > This kit includes a 24 bit ADC and integrated ARM processor in a small PWB > with all the tools and sample code to do what you want with very little code > to write (you can probably use the sample code as-is). > > The kit is $30 (or $35, depending on where you look...) and you will easily > spend that much building something that will not work as well using your > sound card. > > Sound card ADCs are intended for audio, and I'll bet their linearity does not > come close to that of the ADuC702x series, if you can even get the spec for > it. > sound card ADCs, the high end 24 bit ones, are pretty darn linear, and have pretty good SNR as well. 120-130dB S/(N+Distortion+etc) wouldn't be unusual. The surrounding circuitry is likely to be a bigger problem. 1 LSB on a 1V p-p 24bit converter is about 60nV. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
