You choose the conversion clock..... If you are reading the adc very fast you need a low divisor (but there are limits... check the datasheet)
If you sample a much slower changing voltage the largest possible conversion can be used (check the datasheet)
I think for 4mhz there are only two speeds available...
If you sample a much slower changing voltage the largest possible conversion can be used (check the datasheet)
I think for 4mhz there are only two speeds available...