[sdiy] Alfa AS3350 power supply question

[Roman Sowa]

+/-16 max 26 means it cannot be as far from GND pin as 16V but no more 
between any of the pins. So either -10/+16 or vice versa. Max voltage is 
determined by semiconductor process they are using, most probably that's 
related to max p-n junction reverse voltage created in this process. 
Maybe 30V will not kill all of them immedaietely, but they may pop up 
one by one after some time.
Besides, using any component outside recommended ratings is asking for 
trouble. You wouldn't put 16V capacitor at 20V power rail, would you?

But since it works already at +/-3V why not make special supply rails 
just for them? It's not just one chip, you say 100. That deserves a 
special power supply. Even most fancy power supply will be a peanut in 
complexity when compared to whatever you do with 100 dual filters. Even 
if it means the need for 2 additional contacts in the connectors if t's 
done with many boards and not just one.

And that voltage drop will save you about 10W of unnecessary heat wasted 
if 26V supply was applied.

Roman

W dniu 2025-01-21 o 04:25, David G Dixon via Synth-diy pisze:
> Hey SDIY Team,
> I just bought 100 AS3350 dual SVFs for a massive project.  The datasheet 
> is a bit strange.  In one place, it says that the supply can be from 
> +/-3V to +/-16V.  In another it says that the total supply voltage 
> should not exceed 26V.  On the diagram, it says that the supplies can be 
> +3 to +12V and -3 to -12V.
> So, obviously, they are intended for +/-12V supplies.
> My question is this:  What do you think would happen if I used my +/-15V 
> supply?  Would it a) work just fine, b) get too hot, or c) exploderate?
> Of course, I'll try it out, but if it works fine and doesn't get hot, is 
> there some hidden catastrophe that will take me by surprise later?  The 
> chip basically contains four exponential sources and six OTAs.  I don't 
> really understand why it should be that sensitive to supply voltage.
> In a related question, if I want to provide a +/-12V supply for the 
> chip, then what do you think about just dropping 15V to 12V and -12V 
> through a couple of opamps and using that as the supply for the chip?  
> Everything else on the board is perfectly happy with the +/-15V supply.  
> Alternatively, I could use 78L12 and 79L12, but I'd rather avoid that if 
> I could.
> Cheers,
> Dave Dixon
> 
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