RE: nrf52840 and nrf52833 SAADC effective bit number question..

colin_was_here — Fri, 13 Nov 2020 17:36:02 GMT

Thanks, a bunch.. exactly what I wanted to know ;)

RE: nrf52840 and nrf52833 SAADC effective bit number question..

haakonsh — Fri, 13 Nov 2020 13:14:11 GMT

13ENOB is not possible with the nRF SAADC.

Acquisition time is independent of the SAADC performance as long as it complies with Table 1 in the Acquisition time chapter of the PS.

Oversampling will certainly help with increasing the signal-to-noise ratio and there are steps that you can take to decrease the offset, but you can't affect the integral and differential non-linearity of the SAADC.

The SAADC's gain error and offset are fairly temperature-dependent, the instrumentational precision like what the ads1115 provides is far outside our intended use-case, the pricing of the ads1115 reflects that :/