Hi Brooks: I too got the quote on the GP2 and checked the ExpressPCB software package that does both schematic capture and board layout and it has a template for the QFN32 package. For comparison I placed the ICS525 template right beside the QFN32. The ICS525 has 1/4 pitch (0.025") but the QFN is 0.5 mm (0.02") which is a little finer.
I have been able to mount the ICS525 using either solder paste or just an iron. For more on working with SMT parts see my web page: http://www.pacificsites.com/~brooke/SMT.shtml I agree with Randy's comment that the pad on the board needs to be longer to give an iron a place to work. Also solder mask sure is a big help, and that's why it exists. If there's a desired circuit I'm fairly sure I could build it. Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Brooks Shera wrote: >Inspired by Ulrich's lead regarding the high resolution TDC, I asked the >Acam US rep for a quote on the TDC GP2. As Ulrich indicated they are not too >expensive: $28 quantity 1, $26 quantity 10. Sounds great. Temperature >coefficient isn't quoted but it will be considerable - presumably can be >corrected in software. > >For me the catch seems to be that they are packaged in a QFN-32. The pin >spacing is 500 microns and the open space between the solder pads is only >200 microns. Perhaps I am too timid but this sounds like trouble for manual >soldering, that's assuming the low cost PCB suppliers could make the >appropriate solder mask. Any comments from the experienced? > >Acam makes a dandy evaluation board, the ATMD-GPX, but for this they want >$2298. Oh well. > >Brooks > > >----- Original Message ----- >From: "Ulrich Bangert" <[EMAIL PROTECTED]> >To: "'Discussion of precise time and frequency measurement'" ><[email protected]>; "'Magnus Danielson'" <[EMAIL PROTECTED]> >Sent: Thursday, June 29, 2006 11:41 >Subject: Re: [time-nuts] Linear Interpolator > > >Hi Stephan, > >if you need a ps resolution time interval counter for use in a project >of your own, why not simply go out and buy you one? For example here > >http://www.acam.de/index.php?id=105 > >They are not that expensive because they are made to be married with >cheap sensors. > > > >_______________________________________________ >time-nuts mailing list >[email protected] >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
