SAADC channels sampling at different sampling rate

[Ankush]

Hi All,

In my application I have two analog inputs coming from two different sources that I have to sample using one SAADC present inside NRF52. As far as I know, NRF52 has only one ADC with 8 different channels. So my doubt is how can sample two or three channels with different sampling frequency. Also SAADC used double buffering concept i.e. DMA with SAADC, so how can I achieve same with three different channels with different sampling rate.

If I am not wrong, using scan mode of SAADC, three channels would be possible to sample but at one rate . So the sampling interval will be fixed in this case and in one interval I will get three samples from three channels in the buffer that I have specified.

Can anyone suggest me the technique or any documentation related to sampling SAADC channels with different sampling rate?

[wlgrd]

Why do you need different sampling rate? I would presume the current consumption is equal in your case and in a case where all have the same rate as the highest.