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Analog source resistance in TM4C123BE6PM

ISHAN SHAH1
Intellectual 370 points
Other Parts Discussed in Thread: TM4C123BE6PM

Hi all,

There seems to be some discrepancy in the system design guidelines for Tiva C micro-controllers.

The maximum value of Analog source  resistance (Rs) for ADC inputs in TM4C123BE6PM is given to be 500 ohms (MAX) in the data sheet and 1k-10k in the reference design document for Tiva C micro-controllers.

I dont know which value I should use in my design. Please let me know which is correct value.

Ti employees please correct me and the document. 

Below are the link of both the documents with page # where I read the values.

http://www.ti.com/lit/an/spma051/spma051.pdf Tiva reference design document page# 14

http://www.ti.com/lit/ds/spms365b/spms365b.pdf  Data sheet page # 1248

Regards,

Ishan