[time-nuts] Linear Interpolator

Brooks Shera ebs at wildblue.net
Fri Jun 30 17:54:05 EDT 2006


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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