[sdiy] Maxim analog switch ICs

[René Schmitz]

john mahoney wrote:
> There are 2 more options: 
>     MAX4708, MAX4709 
>     Fault-Protected, Single 8-to-1/Dual 4-to-1 Multiplexers 
>     http://www.maxim-ic.com/quick_view2.cfm?qv_pk=3582
> Maxim recommended the MAX4709 chips to Jeff for this application.

  There is also the MPC509A from Burr Brown.

>>http://www.uni-bonn.de/~uzs159/Switching.png
> 
> I don't see what you are trying to do, there, sorry!

The key idea is that the input voltage is first converted into a 
current, and then converted back into a voltage. So the switch never 
sees a voltage greater than a couple of millivolts, if its on, and less 
than +-0.6V when its off. Thus a lowly 4000 series switch can handle 
15Vpp signals. Its much like the corresponding jFET circuits.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159