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Martin Griffith  
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 More options Jul 6, 12:04 am
Newsgroups: sci.electronics.design
From: Martin Griffith <mart_in_med...@yah00.es>
Date: Sat, 05 Jul 2008 21:04:07 +0200
Local: Sun, Jul 6 2008 12:04 am
Subject: Re: PCB power planes?
On Sat, 05 Jul 2008 11:53:46 -0700, in sci.electronics.design John

Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>On Sat, 05 Jul 2008 20:32:36 +0200, Martin Griffith
><mart_in_med...@yah00.es> wrote:

>>Just been looking for ideas
>>http://www.gennum.com/video/pdf/32469DOC.pdf
>>and I havent done any multi layer boards, is fig 5.3 on P24 correct?

>>martin

>2.1.1 is insane. They can't make up their mind whether to use 0r
>resistors or beads, so they are still guessing.

>Splitting grounds is usually a bad idea. Except when it's a terrible
>idea.

>Fig 5.3 looks so weird to me that I assume PDF rendering errors. Does
>anyone else see huge black triangles?

>2.1.2 suggests sequencing or possible latchup problems. Be careful
>here; get more info maybe.

>John

I get the same triangles, silly idiots for letting something out like
that in a ref. design.
I don't think I need all the extra bits, just 1 vid in and an AVR or
8051  to control it, so I was just going to have a vdd and gnd copper
flood on the inner layers, get some cheap boards done to test.

martin


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