RM41L232: What is the recommend external RC value for RM41L232 ADC input pin?

Hello,

I want to know if RM41L232 insede ADC is SAR ADC architecture or not?

If it is, what's the recommend value for external RC of RM41L232 ADC input pin? How to design the external circuit for RM41L232 ADC input pin?

And is there a reference design for RM41L232?

Thank you!

Rachel