[time-nuts] Linear Interpolator

[Robert Atkinson]

Hi Brooke,

Having done this a lot, I'd agree with Randy, conventional solder lots
of flux (I use the liquid rework type but the pens OK) and SoderWick as
you call it over there.
You can get ready made SM to DIL adaptors but they are expensive, Roth
Electronik make a series of PCB's for prototyping that have various
footprints brought out to 0.1" spaced holes. You just break off the one
you need. They have generous pad sizes.
See
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=1172124&N=401
Newark are Farnell's USA company.

Regards,
Robert G8RPI.
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooks Shera
Sent: 30 June 2006 22:54
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Linear Interpolator

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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