[sdiy] Which programable chip?

[Ullrich Peter]

>They have larger analog switches, like so, a 16 x 16 (ones larger still exist as well):
>http://www.analog.com/en/switchesmultiplexers/analog-crosspoint-switches/ad75019/products/product.html
>Runs on a serial interface.
>Is this just going from point A to point B shuffling though inputs, or more more complex sequencing?

And the smaller MT8816 from Mitel / Zarlink can also be an option.
I once designed a SMPTE, Audio, MIDI Matrix with it for a studio in Vienna.

I also designed one audio frequency matrix/mixer board with it for telephony quality signals.
When using the MT8816 as mixer (so summing stages) you loose of course the matrix function...
So on our board (160x100mm) we had 8 MT8816 - 4 as matrix and the others as mixer as far as I remeber.

I also used I think 4 of the MT8816 for the Korg Poly61 MIDI interface that is quite universal as I 
could be used with every matrix keyboard synth. You are right if you say thats an expensive solution, but
it was universal and I got about 50 chips for free as they were left from old projects.

The datasheet is here: http://www.synthdiy.com/files/2007/mt8816.pdf

Ciao
Peter

http://www.ullrich.at.tt



_Kyle

--- On Wed, 4/15/09, Scott Nordlund <gsn10 at hotmail.com> wrote:

> From: Scott Nordlund <gsn10 at hotmail.com>
> Subject: RE: [sdiy] Which programable chip?
> To: synth-diy at dropmix.xs4all.nl
> Date: Wednesday, April 15, 2009, 1:34 PM
>
> Why would you need to run the audio through the processor?
>
> If I'm not mistaken, are you wanting to route one input (of
> 8 total) to one output (of 8 total)?  You can do that
> with 2 4051 multiplexers, and not have to worry about any
> ADCs or DACs or high speed processors or anything.  You
> only need to send 6 bits to control everything.
>
> And if you want to be able to route multiple signals
> simultaneously, it may be slightly more complicated
> (depending on whether you want arbitrary routings, etc.)-
> you may need a crosspoint matrix, even 16 4066 chips (or
> similar), but it's the same basic idea to use analog
> switches to do the work.
>
> ----------------------------------------
> > From: taciturn_unquiet at hotmail.com
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: RE: [sdiy] Which programable chip?
> > Date: Wed, 15 Apr 2009 15:06:05 -0500
> >