First of all I would note that SDADC module is not too suitable if you need to convert to perform fast switching between channels because of t_settling time between every switch. On the device there is also eQADC module present that is much better for this purpose. SDADC is well equipped for frequency-domain digital AC signal processing type applications where continuous conversion of one channel is needed(knock, cylinder pressure).
You may switch channels but need to count with the latency.
