-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Gerhard Fiedler
Sent: Wednesday, March 01, 2006 1:54 PM
To: piclist@mit.edu
Subject: Re: [PIC] Question about a/d converter

>The conversion time is what you always have (and you seem not to be 
>considering it here). The acquisition time is what you only need after you 
>switched channels. If you are reading only one ADC channel, you usually can

>use an acquisition time of 0.

>Gerhard


I disagree. Selection of charge source is NOT the sampling switch!
The sampling switch and series impedance dictate a phase/time delay in
combination with the internal charge hold capacitor. (120 pF)
The holding capacitor is NOT continuously refreshed.
Read the example, you will see microseconds for the minimum charging time.

Tom

  *
  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41MHz PL74.4
 
ARRL Instructor, Technical Specialist, VE Contact.
http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org


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