hi ep,
Checking the maths and stated values in the 18F2550 datasheet for the AD acquisition times shows that the example is wrong.
Perhaps other members could double check my conclusions.? [shown in the attached image]
I have compared a number of d/s for the 16F and 18F and it appears that 'older' parts of the 16F series d/s ADC data has been copied into the 18F series d/s.
Look thru this adc.pdf for guidance on how to calculate the Tacq and the conversion times for the ADC.
Page #18 shows the use of the ADCONO.GO flag usage to check that the conversion is complete.
E