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How big is internal resistance of AD convertor in 18F4520?

 
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djole_nisam_ja



Joined: 10 Dec 2009
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How big is internal resistance of AD convertor in 18F4520?
PostPosted: Tue May 04, 2010 6:46 am     Reply with quote
Can anyone tell me how high is internal resistance of AD convertor in 18F4520?

Thanks
Humberto



Joined: 08 Sep 2003
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PostPosted: Tue May 04, 2010 7:21 am     Reply with quote
The maximum recommended impedance for analog sources connected to AD converter pin is 2.5K
Microchip DS39631 -Section 19.1- A/D Acquisition Requeriments

Humberto
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Tue May 04, 2010 8:24 am     Reply with quote
And, the internal resistance, is also in the sheet. 1K, for the MUX, and interconnection, and between 1K, and 4K, for the ADC FET switch, depending on the supply voltage.

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