Lpc2000

--- In lpc2000@yahoogroups.com, rseku <rseku@p...> wrote:
> I'm not sure, that You know if high source impedance will increase 
> sample collection time.

Yes, Good point.  I will not be sampling this pin very fast at all, 
so speed is not really the issue in this particular application.  I 
am really more concerned with making sure the impedances are not 
completely out of range.  I would like to assume it is in the 10k 
range????
I think I am going to use a buffer to start out with, I would really 
like this proto to work.  
Thanks for the input.
-Dave

> 
> drb5599 wrote:
> > Sorry if this is an obvious question.  But, I have looked at the 
User 
> > Manual, and all other documentation I have and can not find a 
> > specification for input impedance on the ADC input pins????
> > 
> > Does anybody know what this impedance is??
> > 
> > I am going to be feeding a signal with a 200k impedance to one 
of the 
> > ADC inputs and am trying to figure out if I need a buffer or not.
> > 
> > Thanks,
> > Dave Butler
> > 
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> > 
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> >  
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> >