simple sample/hold circuit?

[Rene Schmitz]

At 10:46 03.10.99 -0600, Ian Fritz wrote:

>I've never been very happy with the 4051's.  They often have too much
>cross talk and/or digital feedthrough.  I had to deselect about half of
>them.  If I were doing it again, I'd look for something better. Does
>anyone know of a pin-for-pin replacement with better performance? SSM
>used to sell a drop-in replacement MUX with the storage cap and buffer
>built in.

I had trouble with crosstalk too. But changeing the scheme in which the
individual caps are updated helped. 
It can happen that two switches are on at the same time, when the selector
bits change. Due to finite switching times.

The steps I do are:

Disable all switches.
Select the new switch.
Enable all switches.

This circumvents that problem.

Bye
 René

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