LFCSP (QFN) with 0.5mm spacing is very easy to do... have done about a dozen
(AD9912) with nil failures using just solder paste, a $50PID controller
and a $20
oven. refs all around on the web. You may get a bridge here and there
but you can
wick them away ;-) easily.
QFP has leads so is even easier imho.
BGAs is another story - avoid at all costs in hobby designs.
Xtof,
On 16/12/10 20:59, Bob Camp wrote:
Hi
> From what I have seen of hand soldered 0.5 mm spaced / several hundred pin
packages - not very easy at all, even with pro gear and pro soldering
people. Based on the adverse reaction on the list to 14 pin 1 mm spaced
parts, I don't think there's much chance of a big QFP being popular.
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of K. Szeker
Sent: Thursday, December 16, 2010 2:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency counter recommendation
Hi Bob,
If a 256 ball package is the solution for these FPGA, I would prefer it in
256 QFP-package version-if exists.
These will be solderable for the good "home-specialists", bat a BGA (even
with "only" 256 balls) is a real problem for home labs...
Karesz
2010/12/16 Bob Camp<li...@rtty.us>
Hi
Yes indeed, been there done that. Not very hard at all.
All you need is the six layer pc board (can be bought), the FPGA (Digikey
has them), a few of these and a couple of those. Spend less than $100 and
you are in business if the PC board volume is high enough.
In this case the next step in the business is to solder the 256 ball 1 mm
spacing BGA package down on the pc board. Not so easy without the right
tools...
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Don Latham
Sent: Wednesday, December 15, 2010 3:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency counter recommendation
OK, time-nuts, here's the gauntlet. can't "we" generate a design for a
PC-based FPGA or chip setup that would be generally useful as a counter?
We've seen thorough discussions about trigger jitter, which IMHO is the
fundamental problem. And isn't the PIC2 Time base from 10 MHz standard,
all else should be straightforward.
I'm not a designer, just a messer-arounder, or I'd give it a shot. Robot
Basic is a nice PC software maybe.
Don
J. L. Trantham, M. D.
I suspect that this question will lead to a discussion of Dual Mixers
but
as
far as the counter question goes, I would recommend you consider an HP
5370B.
Joe
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Dave M
Sent: Wednesday, December 15, 2010 1:55 PM
To: TimeNuts
Subject: [time-nuts] Frequency counter recommendation
I'm a retired electronics tech and computer programmer. I have a pretty
decently equipped shop for almost all of my projects and experiments.
However, my time and frequency equipment is a bit long in the tooth. I
have
a couple old HP 5328A counters (commercial version; not the military
version), one with a 10544, the other with a 10811 oscillator.
I have an HP Z3801A that has been operating well for several years, and
recently acquired a TBolt to keep the counters in tune. I also have a
good
distribution amp and couple of old Montronics (Fluke) frequency
comparators.
What I'm looking for now, is a recommendation for a good low-cost
(<$400)
counter that will get me on the way to performing some of the "down in
the
grass" noise, jitter and deviation tests that the more learned members
of
the group discuss. I know that new equipment is far out of my budget,
but
I'm also aware that some of the older, now obsolete (also cheaper)
equipment
is quite capable of doing what I want to do. I prefer HP equipment since
manuals are much easier to find than most other brands.
I'd also like recommendation for a good low-cost GPIB controller that
allows
me to write software to control some of my instruments. I have
experience
writing software in BASIC on a Fluke 1722A controller. I've seen these
controllers on the Bay and other online vendors, but I've not located
the
BASIC discs for them. Any advice?
I realize that a counter is not the only piece that I need, but it's
first
on my list. Other, more applicable equipment is on my want list, but
will
have to wait for a bit.
Thanks for advice,
David
dgminala at mediacombb dot net
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--
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
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