Hi,,,
am using 8 channels of pic18f4550 as analog inputs. my problem was how to calculate sampling rate for eight channels and also for individual channels..
i studied the datasheet but still i didi't get a clear understanding...

internal osc frequency Fosc=48mhz...




thanks

 

I have not the datasheet for your PIC. But I guess it has onboard timers. So you can use a timer for generating interrupts. In the interrupt service routine you scan your AD channels.
How often an interrupt occurs will determine the sample rate.

 

For 8 channels one channel at a time the 18F4550 will be around 4kHz

 

thanks for all of ur replies....

i have calculated 48mhz/64=1.33us
20Tad = 20 * 1.33us = 0.03759 like this i got is this correct method
if correct means how to calculate for individual channels using this sampling rate...

thanks