nRF52840: What is the input impedance of the ADC inputs ? In spec it is greater than 1M but how much.
We would be happy with 5M ohms mean value.
nRF52840: What is the input impedance of the ADC inputs ? In spec it is greater than 1M but how much.
We would be happy with 5M ohms mean value.
As Håkon stated, it is just switched capacitance input. As are most ADC's.
You just use the e^(t/RC) relationship to figure out the sample time vs. input impedance appropriate for your design. R is of course the source thevenin equivalent from whatever your source is.
As Håkon stated, it is just switched capacitance input. As are most ADC's.
You just use the e^(t/RC) relationship to figure out the sample time vs. input impedance appropriate for your design. R is of course the source thevenin equivalent from whatever your source is.