Calulate ADC conversion time.

[leesh]

Posted on October 28, 2008 at 06:10

Calulate ADC conversion time.

[leesh]

Posted on May 17, 2011 at 12:49

Hi,

i'm korean and my english is poor. how to calculate adc conversion time at 72MHz. 1.ADC maximum clock is 14MHz -> is it right? 2.if i don't set up adc prescaler, ADC work on?? 3.at sample time = 55.5cycles so, one channel conversion time(69.5clk) = sample time(55.5) + conversion time(14) --> right?

[paulsmitton9]

Posted on May 17, 2011 at 12:49

1.ADC maximum clock is 14MHz -> is it right?

Yes. 2.if i don't set up adc prescaler, ADC work on?? You must set the prescaler. If your clock is 72Mhz, set it to 6. (72 / 6 = 12Mhz, 12Mhz <= 14Mhz) 3.at sample time = 55.5cycles so, one channel conversion time(69.5clk) = sample time(55.5) + conversion time(14) --> right? Conversion time = 12.5 cycles. Total Cycles = Sample Cycles + Conversion Cycles = 55.5 + 12.5 = 68 Cycles = 5.67 us (at 12Mhz) [ This message was edited by: paul.smitton on 28-10-2008 10:41 ]