Calulate ADC conversion time.

Posted on October 28, 2008 at 06:10

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Associate III

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 ]

leeshAuthor

Associate

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?

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