[sdiy] Using the VEE pin on a 405x Multiplexer

[Harry Bissell]

You are way over the 18V max rating. Watch out...

(supplies fromV- to V+ should not exceed 18V max

+/-7.5 would be more reasonable...

or use a part that can take it (DG series..)

H^) harry


----- Original Message -----
From: dan snazelle <subjectivity at hotmail.com>
To: Justin Owen <juzowen at googlemail.com>
Cc: 'SDIY List' <synth-diy at dropmix.xs4all.nl>
Sent: Fri, 08 Oct 2010 13:11:53 -0400 (EDT)
Subject: Re: [sdiy] Using the VEE pin on a 405x Multiplexer

this is very exciting news

i have always wondered this myself and i dont know why i didnt just go ahead and try it....but now YOU have done it for us

thanks!

> Well, I got bored and impatient so I plugged VDD: +12V, VSS: 0V and VEE: -12V and I'm now running an 11.5V PP AC sine wave through it with no probs.
> 
> No smoke, no warmth on the chip (so far), as far as I can tell sine in = sine out.
> 
> So there you go. If anyone has a reason why I shouldn't be doing this - please chime in.
> 
> J






On Oct 8, 2010, at 12:25 PM, Justin Owen wrote:

> -----Original Message-----
> From: David G. Dixon [dixon at interchange.ubc.ca]
> Received: 08.10.2010 16:55:55
> To: 'Justin Owen'; 'SDIY List'
> Subject: RE: [sdiy] Using the VEE pin on a 405x Multiplexer
> 
>>> I'm trying to understand how to use VEE (Pin 7) on a 4053 Multiplexer.
> 
>>> My understanding is that I can apply a negative voltage bias to this pin
>>> which will allow an AC signal to pass through (I'm hoping for approx. 10V
>>> PP @ +/-5V) - all while powering it with +12V @ VDD Pin 16.
> 
>>> Can anyone confirm a) if this understanding is right, b) what the maximum
>>> negative voltage is (is -12V OK?) that I can apply to VEE and c) is it
>>> just one in, one out or is there some equation balance between VDD & VEE.
> 
>> The CD405x datasheet says it can handle signals up to 15Vp-p, and mentions
>> specifically that VDD = 5V and VEE = -5V allows +/-5V signals to pass.
>> However, under the Absolute Maximum Ratings section, it says the minimum
>> input voltage is 0.5VDC.  These statements would appear to be mutually
>> exclusive!
> 
> 
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

-- 
Harry Bissell & Nora Abdullah 4eva