[sdiy] Question about CMOS switches

[David]

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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