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689 Views Contributor IV

Hi,

I want calculate the ADC Conversion time:

In the RM is this formula:

ADC TOTAL CONVERSION TIME = Sample Phase Time (set by SMPLTS + 1) + Hold
Phase (1 ADC Cycle) + Compare Phase Time (8-bit Mode = 20 ADC Cycles, 10-bit
Mode = 24 ADC Cycles, 12-bit Mode = 28 ADC Cycles) + Single or First continuous

When I have 8 ADC Chanels in Back to Back mode, must I add the Single or First continuous
time adder (5 ADC cycles + 5 bus clock cycles) once or eight times to calculate the complete Conversion time?

I would calculate for the 8 ADC Conversions so:

SUM=

Sample Phase Time (set by SMPLTS + 1)  *8

+ Hold Phase (1 ADC Cycle) *8

+ Compare Phase Time (12-bit Mode = 28 ADC Cycles) )*8

+ Single or First continuous  time adder (5 ADC cycles + 5 bus clock cycles) *??(1 or 8).

BR Lutz

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2 Replies
299 Views  NXP Employee

Hi Lutz Köhler

As long as you are measuring 8 different channels, you have to add the single time adder per each channel, so (5 ADC cycles + 5 bus clock cycles) * 8.

Hope this helps.

Regards

299 Views Contributor II

Hi Jorge,

where I can find in data sheets the values for ADC cycles + bus clock cycles in order to get a numerical conversion time figure ?

Thanks  