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'[BUY]: multiplexers'
2001\01\16@221414 by Tweedy Bird

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Hi everyone,

I am looking for a smart analog multiplexer 4 to 1 or a smart switch.  If
anyone knows where I can find this part, please let me know.

Thank you for your time..
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2001\01\17@085305 by Mitchell D. Miller

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Sounds like a 4066 might be a candidate.

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-----Original Message-----
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[.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU]On Behalf Of Tweedy Bird
Sent: Tuesday, January 16, 2001 9:15 PM
To: PICLISTspamKILLspamMITVMA.MIT.EDU
Subject: [BUY]: multiplexers


Hi everyone,

I am looking for a smart analog multiplexer 4 to 1 or a smart switch.  If
anyone knows where I can find this part, please let me know.

Thank you for your time..
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2001\01\17@133551 by Dan Michaels

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Tweedy Bird wrote:

>I am looking for a smart analog multiplexer 4 to 1 or a smart switch.  If
>anyone knows where I can find this part, please let me know.
>

What on earth does "smart" mean?

Something like a 74HC4052 will give you a garden variety
dual 4x1 switch.

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2001\01\17@174835 by Stephen B Webb

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> >I am looking for a smart analog multiplexer 4 to 1 or a smart switch.  If
> >anyone knows where I can find this part, please let me know.


I too am looking for something similar.

I only need a 2:1 mux, but I need it to be suitable for switching NTSC
video signals quickly (ie 29.94 Hz, or whatever it is).  I need it to
switch between two sources between each frame, and it has to be "clean"
enough to not muck up the sync signal.

Any ideas?

-Steve

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2001\01\17@184159 by Chris Carr

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> > >I am looking for a smart analog multiplexer 4 to 1 or a smart switch.
If
> > >anyone knows where I can find this part, please let me know.
>
>
> I too am looking for something similar.
>
> I only need a 2:1 mux, but I need it to be suitable for switching NTSC
> video signals quickly (ie 29.94 Hz, or whatever it is).  I need it to
> switch between two sources between each frame, and it has to be "clean"
> enough to not muck up the sync signal.
>
> Any ideas?
>
Have you looked at Maxim
http://para.maxim-ic.com/SwitchMux.asp

Regards
Chris

p.s.  Switching at Frame Rate is not (in video terms) switching
"quickly" in fact this is the slowest switching rate.

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2001\01\17@191508 by Stephen B Webb

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> p.s.  Switching at Frame Rate is not (in video terms) switching
> "quickly" in fact this is the slowest switching rate.

Switching at frame rate is a heck of a lot quicker than my Sony home
theatre receiver will let me do.


I said "quickly" to impress that I didn't mean that I would be
switching once every few minutes or so - and that I need to maintain a
clean sync signal, etc.  (ie a relay ainn't gonna cut it)


-Steve

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2001\01\18@073748 by Roman Black

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Stephen B Webb wrote:
>
> > p.s.  Switching at Frame Rate is not (in video terms) switching
> > "quickly" in fact this is the slowest switching rate.
>
> Switching at frame rate is a heck of a lot quicker than my Sony home
> theatre receiver will let me do.
>
> I said "quickly" to impress that I didn't mean that I would be
> switching once every few minutes or so - and that I need to maintain a
> clean sync signal, etc.  (ie a relay ainn't gonna cut it)
>
> -Steve


Steve, in the TV industry is it common to use the cheap
4066 quad analog switch chip for AV switching. I buy them
by the bagful. They will switch at frame rate with no probs,
and will switch the standard "AV inputs/outputs" that come
from the back of your set. And they will commonly fail
with weird faults after 6+ years in a hot environment.
Especially the Toshiba brand chips. :o)
-Roman

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2001\01\18@073822 by Simon Nield

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steve:
>switch between two sources between each frame, and it has to be "clean"
>enough to not muck up the sync signal.

I have used maxim analog switches for this in the past. obtaining stock from them was at times a bit
scary as they were having some fab problems which they were not being too candid about.
'Standard' 4000 series analog muxers should do this job just fine (check the bandwidth specs to be
sure as I have only used them for audio, but I seem to remember they had plenty of bandwidth to
spare).
You will get better results if you buffer the video into and out of the muxers (iirc you can get
parts from Maxim with built in buffers).
Remember you ideally want to time your switching point to be in the vertical blanking interval so's
you don't get a visible switching point, this also means having locked video sources... if this is
for a home system then you won't be able to do this so you need not worry about trying, just means
you'll get a splat & probably some roll as you switch the signals.

Regards,
Simon

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2001\01\19@172037 by Peter L. Peres

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>What on earth does "smart" mean?

Sellspeak for >= 1 CMOS inverter used in the drive logic of the
multiplexer.

Peter

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2001\01\19@172049 by Peter L. Peres

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>I only need a 2:1 mux, but I need it to be suitable for switching NTSC
>video signals quickly (ie 29.94 Hz, or whatever it is).  I need it to

NJRC NJM22xx video buffers/switches I think.

Peter

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'[PIC] Programming and De-Multiplexers'
2008\08\22@164418 by computergeekxp
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How can I write a function which encodes data like a multiplexer, so it can
be fed out a pin into a demultiplexer? I understand the function a
de/multiplexer but not its intricacies.
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2008\08\22@165709 by olin piclist

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computergeekxp wrote:
> How can I write a function which encodes data like a
> multiplexer, so it can be fed out a pin into a demultiplexer?

Is the demultiplexer protocol already set, or is it something you get to
pick?  How many lines?  What data rate?  Why do you need to convert to a
single signal?  What constraints does that signal have?

It's rediculous to even begin to suggest anything without a lot more
information.

It's the wrong time of year for end of semester assignment coming due, but
this smells like one.


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2008\08\23@131001 by computergeekxp

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Could you provide a reference page on doing this or perhaps some code I can
look at? I'm not even sure of the specifics yet. The overall idea is to use
a pic to drive a series of led's. Each one would get a series of pulses to
control their brightness (smoothed out with a capacitor). This is not an
assignment; i'm not in college yet.


Olin Lathrop wrote:
{Quote hidden}

> --

2008\08\23@214722 by Bob Blick

face
flavicon
face
Are you talking about parallel-to-serial in general, or meeting some
hardware or software signaling standard?

Because in general you would use a shift or rotate command after testing
the bit at whatever end you are shifting away from.

It also might depend on what PIC architecture you're planning to use,
and what language.

But I've already invested more time in my response than you did in your
original question. The ball's in your court now.

Cheerful regards,

Bob

computergeekxp wrote:
> How can I write a function which encodes data like a multiplexer, so it can
> be fed out a pin into a demultiplexer? I understand the function a
> de/multiplexer but not its intricacies.

2008\08\26@072507 by Alan B. Pearce

face picon face
> How can I write a function which encodes data like a
> multiplexer, so it can be fed out a pin into a demultiplexer?

Study how a serial port works?

2008\08\26@232603 by cdb

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face


:: How can I write a function which encodes data like a
:::: multiplexer, so it can be fed out a pin into a demultiplexer?

I have some code for a 74HC595, and a big boy 32 bit version for LCD
displays.

But do you know how to send a serial information out of a PIC?

Which end of your serial stream is to be first - left hand bit or
right hand bit (msb or lsb)?

Do you have a specific demultiplexor chip in mind?

Colin
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