ADC conversion time doubts

DeepakKukreja — Wed, 01 Jul 2020 07:33:39 GMT

Hi,

I am using Kinetis K12 device MK12DN512VLK5.

I have few doubts regarding the ADC conversion time calculations given in the reference manual.

The reference manual provides the below formula for calculating the conversion time:

I understand that the above formula gives the total time for conversion and takes into account the

sampling time,
ADC conversion time as well as the
time required for averaging if that is selected.

Is my understanding correct?

My doubt arises because of the example time calculation shown in the reference manual:

My calculation for the above example (based on the formula given in the reference manual) comes to 1731.625 micro-seconds.

time = "3 ADCK cycles" + "5 bus clock cycles" + (32 x "34+20 ADCK cycles" )

ADCK clock cycle time is 1.000 uSec ( from ADCk freq. = 8 MHz/8 )

Bus clock cycle time is 0.125 uSec ( from 8 Mhz bus clock frequency)

I am misunderstanding something or is this an issue in the reference manual?

Re: ADC conversion time doubts

nxf56274 — Wed, 01 Jul 2020 08:50:03 GMT

Hi,

The document has some mistakes. Your calculation is right.

Have a great day,
TIC

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Kinetis MicrocontrollersのトピックADC conversion time doubts

ADC conversion time doubts

Re: ADC conversion time doubts