[time-nuts] Linear Interpolator
Brooke Clarke
brooke at pacific.net
Fri Jun 30 19:30:05 EDT 2006
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" <df6jb at ulrich-bangert.de>
>To: "'Discussion of precise time and frequency measurement'"
><time-nuts at febo.com>; "'Magnus Danielson'" <cfmd at bredband.net>
>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.
>
>
>
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>
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