Patrick, For $99, you can buy a Silabs C8051F350 development kit which includes a microcontroller with built-in 24 bit, 8 channel A/D converter with serial port and the development tools.
http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers /Precision_Mixed-Signal/en/C8051F350DK.htm If that is still too rich for you :-) you can try the Texas Instrument MSC1210 DAQ-Evaluation_module http://focus.ti.com/docs/toolsw/folders/print/msc1210-daq-evm.html which is a small PWB that plugs directly into the serial port and has another 8051 variant microprocessor with also a 24 bit/8 channel A/D converter. I have used (and still use) the MSC1210, but while I have used a number of the Silicon Lab parts, I have not used the C8051F350. In my opinion, the development tools and support from Silabs are vastly superior to the tools provided by Texas Instrument (essentially none). Of course, in either case, you will have to write some software, but the Silabs kit comes with sample programs that actually work and get a lot of the low level stuff out of the way. Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Patrick > Sent: Friday, January 18, 2008 6:36 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] 20 bit+ (Slightly OT: inexpensive > USB analog-digital converter?) > > This has been a really interesting thread. I think I am going > to get a labjack too.They have a 24 bit A/D model but it is > expensive and has features I don't need. I am looking for > something with 20 bit+ resolution but a little cheaper. The > sampling rate can be very slow. > > Thanks in advance-Patrick > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, > go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.19.2/1223 - Release > Date: 1/13/2008 8:23 PM > > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.2/1223 - Release Date: 1/13/2008 8:23 PM _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
