[sdiy] DG413 question

[JH.]

>Yeah, it would be quite uncool if one manufacturer's device worked this way
>but another's blew up.  :-)

I don't find a DG413 from Analog Devices.
They have a chip called ADG413 - and this has that strange voltage limit.


>OTOH, it's not simple to get CMOS devices to operate at these large
>voltages, is it?

Yes - you basically need a bigger geometry for higher voltage.
Hard to understand why _parts_ of a chip can stand the higher voltage and 
others can't, though.
I mean, I know this from mixed signal ASICs: You're using a (smaller) low 
voltage technology for
your digital part, and a (larger) high voltage technology for the analogue 
part (or where ever you need
it). Makes sense to keep chip size small when you integrate a DSP and high 
voltage analogue on the
same silicon. But for a simple transmission gate chip? Strange.

>So if the two technologies aren't exactly the same, they
>well might have different limits.

Absolutely.

JH.