[sdiy] DG413 question

[Ian Fritz]

At 02:49 PM 2/1/2007, Dave Manley wrote:
>JH. wrote:
>>>>V+ = VL = 30V
>>>And?  V- = GND = 0V ?
>>Well yes; actually I have V+ = VL = +15V, and V- = "GND"-Pin = -15V, but 
>>that's equivalent to single supply 30V with VL = V+.
>Given the feedback from Intersil, it makes me wonder if the Analog Devices 
>spec is wrong with its VDD-GND spec of <=25V.


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

OTOH, it's not simple to get CMOS devices to operate at these large 
voltages, is it?  So if the two technologies aren't exactly the same, they 
well might have different limits.  I only have some of the rather expensive 
AD switches, so I don't particularily feel like trying any experiments here.

Anyway, if it was me I would just ground the GND pin (with a bipolar supply).

   Ian