Signal source impedance for ADC in AT90S8535?
David VanHorn email (remove spam text)
At 06:06 PM 11/2/01 +0100, Wojciech Zabolotny wrote:
>I have to design a simple circuit using the ADC in AVR AT90S8535.
>I remeber the strong requirements for signal source impedance in PICs,
>but the only info in 8535 datasheet was "RAIN Analog Input Resistance = 100
>MOhm (typ.)". Does it mean that the S/H in 8535 features the internal
>voltage follower or something like this?
>I'd appreciate any pointers.
Basically yes. It's input impedance is high enough that in most
applications you can consider it infinite.
Dave's Engineering Page: http://www.dvanhorn.org
Got a need to read Bar codes? http://www.barcodechip.com
Bi-directional read of UPC-A, UPC-E, EAN-8, EAN-13, JAN, and Bookland, with
two or five digit supplemental codes, in an 8 pin chip, with NO external parts.
http://www.piclist.com hint: To leave the PICList
In reply to: <20011102180603.A9769@ipebio15.ise.pw.edu.pl>
See also: www.piclist.com/techref/io/atod.htm?key=adc
You must be a member of the
piclist mailing list
(not only a www.piclist.com member) to post to the