[sdiy] matrix ICs

[Microtonal]

I used an 8x8 crosspoint matrix IC ages ago to switch T1 (1.544 Mbps)
signals, so it should be good enough for audio.  If I recall correctly, it
was an RCA part, CD22106.  It was in a large 600 mil DIP package, probably
around 40-48 pins.  I would guess that either Harris or Intersil make the
part now, or something similar.

John Loffink
microtonal at worldnet.att.net


----- Original Message -----
From: "Paul R. Higgins" <higg0008 at tc.umn.edu>
To: <mervyn.thomas at astrium-space.com>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, October 05, 2001 4:01 PM
Subject: Re: [sdiy] matrix ICs


> > I guess this means that video and audio are NOT interchangeable???
Biggest
> > problem I can see for the average DIYer is that these devices are high
pin
> > count which means fine pitch SMDs - should be fun to solder. Also
probably
> > quite expensive but cheaper than a patch matrix panel and more elegant
> > [IMHO].
>
> Quite a few of the matrix ICs are manufactured in through-hole versions.
But
> the really big matrices from AD are only available in SMD packages (PLCC,
etc.).
> As for audio/video matrices and their interchangeability, I've had a look
at the
> datasheet for the Intersil matrix (HA456), and it looks like it _might_
work OK
> for audio.  I'm leaving the final determination on that to those who have
used
> the part.  The HA456 is set up specifically for video, with
high-current/speed
> line drivers. OTOH, that might be an added bonus for audio purposes.
However,
> the headroom doesn't look that great--max supply is 12V (rail-to-rail).
>
> As for expense, a quick look at the various manufacturers' websites shows
prices
> which are pretty reasonable.  Plus, you should be able to get a couple as
> samples.  The eval boards from AD are a bit pricey for the hobbyist,
however
> (about $400 US).
>
> Does anyone know about the 8 x 8 matrix that's part of someone's HC/HCT
CMOS
> line?  I thought I saw it once in a Digi-Key catalog.
>
> -PRH
>