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From: "Frank Bemelman"
Subject: Re: Is this chip suitable for video signal switching?
Date: Fri, 17 Jan 2003 23:20:24 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Organization: EuroNet Internet
NNTP-Posting-Date: 17 Jan 2003 22:20:44 GMT
"Thomas" schreef in bericht
> BarryNL wrote:
> > I pulled an MC14066B chip out of an old video although I'm not sure what
> > function was in there. However, I'd like to use to to switch a video
> > (ie. the composite signal in a SCART cable) and was wondering if anyone
> > if it was suitable for this (basically, I want to use it to multiplex
> > between the normal signal and black/white (0.3/1.0V) signals, so I can
> > overlay text onto a picture using a PIC). The data sheet just says its a
> > Quad Analog Switch/Multiplexer but I don't know if it's suitable for
> > as fast as video signals. I've put a copy of the data sheet on the web
> > http://www.xs4all.nl/~barryxs/MC14066B.pdf if anyone wants to see it.
> I think it will transfer teh video signals fine, but siwthces too slow to
> in and out on a pixel level.
I have use them to switch videosignals, no problem. But I never used them
to superimpose graphics or text. But 120nS (worst case) it seems fast enough
to me, TV video bandwidth isn't that high after all, 6MHz max?
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