04-14-2020
03:53 AM
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subham_dey
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I am trying to find out the conversion time for ADC conversion time for S32k146. The formula of total conversion time is given in datasheet.
ADC TOTAL CONVERSION TIME = Sample Phase time(set by SMPLTS+1) + Hold phase(1 ADC cycle) +Compare phase time( 8 bit mode = 20 ADC cycle, 10 bit mode = 24 ADC cycle, 12 bit mode = 28 ADC cycles) + Single or First continuous time adder(5 ADC cycle +5 bus clock cycles)
but i could not able to find out how much time required for 1 ADC cycle and 1 Bus clock cycle??
ADC peripheral clock frequency(SOSCDIV2_CLK) is 8 MHz and bus clock frequency is 40 MHz.
Kindly help me to find conversion time by today itself as it urgent for project.@
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04-14-2020
01:59 PM
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NXP TechSupport
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Hi,
bus cycle = 1 / bus clock frequency = 1/ 40MHz = 25ns
ADC cycle = 1 / ADCK clock = 1 / 8 MHz = 125ns; assuming SOSCDIV2_CLK (8MHz) is selected by PCC_ADCx[PCS] and divided further in ADC by 1, i.e. ADC_CFG1[ADIV] = 0
BR, Petr
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04-14-2020
01:59 PM
3,392 Views


NXP TechSupport
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Hi,
bus cycle = 1 / bus clock frequency = 1/ 40MHz = 25ns
ADC cycle = 1 / ADCK clock = 1 / 8 MHz = 125ns; assuming SOSCDIV2_CLK (8MHz) is selected by PCC_ADCx[PCS] and divided further in ADC by 1, i.e. ADC_CFG1[ADIV] = 0
BR, Petr
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04-15-2020
02:27 AM
3,391 Views
subham_dey
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Thanks Petr Stancik .
