[sdiy] DG413 question

[Ian Fritz]

At 03:10 PM 1/31/2007, Dave Manley wrote:
>I haven't used the part, but looking at the data sheets, it is safe to 
>connect VL to V+.  However connecting GND to -15 violates the max V+ to 
>GND spec (25V in the AD datasheet, interestingly the other data sheets 
>from Maxim and Intersil spec it the other way GND to V- max 25V).
>
>So connect as you describe, but GND to 0V.  The logic inputs are spec'd to 
>operate to the rails so no problem there.

Agree. Look under "terminology" to see:

V_DD    Most positive ps potential
V_SS    Most negative ps potential in dual supplies
V_L     Logic ps (5V)
GND     Ground (0V) reference

For single supplies you connect V_SS and GND to ground.  But for dual 
supplies, if you connect both to -Vps, then I believe you would have to 
refer the logic signal to there also.  (But you would also possibly violate 
the GND to ps limit, as others mentioned.)

   Ian