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ADC in free run

Question asked by Pietro di Castri on Jan 9, 2018
Latest reply on Jan 21, 2018 by Robin_Shen

Good morning

I want to use the ADC in free run. I init a clock as fast as possible for having the fastest speed. For testing the speed I enable the interrupt and I toggle one I/O every tick,. The result on the scope is not what I expect. The rate is very irregular. I don t get the point.

I am using the FRDM for K64. The BUS clock is 60 MHz. The division is 4 so the ADCLK is 15MHz. It should be ok for the 8 bit resolution. 

Is there a suggestion for the irregularity of the interrupt??

Thank You