[sdiy] Question about CMOS switches

[Barry Klein]

Hey these are interesting...  how are they constructed?
How fast are they?  Any downside to using them?
Data sheet mentions one use as "Amusement"  hmmm....

Barry

----- Original Message ----- 
From: "David" <dingebre at 3dphysics.net>
To: "'Synth DIY'" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, January 16, 2011 12:38
Subject: Re: [sdiy] Question about CMOS switches


> Why not use something like the Panasonic AQY282EH? It has lower on
> resistance and doesn't need a power supply?
> 
> David
> 
> 
> 
> -- -----Original Message-----
> -- From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> -- bounces at dropmix.xs4all.nl] On Behalf Of Donald Tillman
> -- Sent: Sunday, January 16, 2011 11:10 AM
> -- To: David G. Dixon
> -- Cc: 'Synth DIY'
> -- Subject: Re: [sdiy] Question about CMOS switches
> -- 
> -- On Jan 15, 2011, at 11:20 PM, David G. Dixon wrote:
> -- 
> -- > Here's a quick question for any digital gurus out there:
> -- 
> -- (Analog, actually.   :-) )
> -- 
> -- 
> -- > Is there any problem driving analog switches in the DG series with
> switching
> -- > signals that swing to (or near) the rails (provided, of course, that
> the
> -- > switches are powered from the rails)?
> -- 
> -- Yeah, there is...
> -- 
> -- On devices like the DG409, the switch still works, but it injects a
> significant amount of
> -- charge into the analog lines.   So if you care about charge injection
> you'll need to limit the
> -- control voltage swing.
> -- 
> -- That's not mentioned in the data sheets; I discovered it the hard way.
> -- 
> --   -- Don
> -- 
> -- --
> -- Don Tillman
> -- Palo Alto, California
> -- don at till.com
> -- http://www.till.com
> -- 
> -- 
> -- 
> -- 
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