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

[Jason Proctor]

i think Ken's sequential switch module does something similar with a 
4051. there's a note at the end of the "how it works" section 
regarding it --

http://cgs.synth.net/modules/cgs28_seq_switch.html

must confess i still don't understand it! :-S



>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