CROSSPOINT

[Magnus Danielson]

From: "Paul Maddox" <paul.maddox at ndirect.co.uk>
Subject: CROSSPOINT
Date: Wed, 14 Jun 2000 16:20:07 +0100

> Dear all,
> 
> 
>  Anyone know of any good crosspoint switches? Ideally 16 by 16 or bigger and
> also with an ON resistance of say 1K (10k would be ideal)

Go and check out companies like Harris, Mitel and SGS Thomson. They both cary
crossbar analog switches. The largest one I have seen is 16x8 and is
available in a 40 pin DIP or 44 pin PLCC. The Ron value is typically
around 40 Ohm. I would not count on the resistance to have a specific
value since it really relate to temperature, applied power voltage and
voltage level of input.

The frequency responce is touching 50 MHz and the crosstalk at 5 kHz
is 110 dB. The THD is 0.01 % for a 2 Vpp 1kHz sine signal.

The Harris number is CD22M3494 but I now from prior investigations
that it is not hard to find from the others.

The CD22M3494 is not hard to operate, you have a 7 bit address
register and a 1 bit data input in order to individually operate the
memory which holds the state of each analog switch. So, operation
should be child-play level ;)

Cheers,
Magnus