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Topic: Input impedance on the ADC pins ? (Read 2376 times) previous topic - next topic

fsabbari

Hi,
I'm currrently working on a project using the MKRWAN1300, and I nedd to know the input impedance of the analog pins ? is there who knows where can I find this ?

Thanks !

mjunior-fitec

According to the SAMD21 datasheet (page 991, table 37-15: Normal I/O pins characteristics), the resistance is typically 40(+/- 20) kΩ.

Not sure if this is the information you're looking for. This is the pin resistance using internal Pull-up or Pull-down (RPULL).

Regards.

fsabbari

Thanks for your reply,
After verifying the datasheet you referred me too, I found out that the input resistance of the ADC is only 3.5 KΩ wich is very small :/. Wich is also normal, because the value of the resistance will impact the time that the sampling capacitor will take to be charged !
However thanks a lot for your help ! :)

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