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OPT4001-Q1: Conversion time definition and maximum data

Yuto Kitamura
Expert 6455 points
Part Number: OPT4001-Q1
Other Parts Discussed in Thread: OPT4001

Tool/software:

Dear team,

Would you please help us to understand the conversion time of OPT4001-Q1?

The datasheet mentions "Conversion time is defined as the time taken from initiation to completion of one measurement, including the time taken to update the results in the output register" and "Conversion time includes the light integration time and analog-to-digital (ADC) conversion time". According to these explanation, the conversion time does not include "photodiode response time." - is my understanding correct?

If so, would you let me know the photodiode response time which is used in OPT4001? I understood it would be super fast than "ADC conversion time" and can be ignored practically, especially in higher accuracy settings, but let me know for reference.

Also can we know the worst conversion time of each CONVERSION TIME settings? I understand it is also depending on input light intensity, but please let us know the worst case of that.

best regards,
Yuto Kitamura

  • 0
    TI__Expert 4280 points

    Hi Yuto,

    From the first definition you mentioned, the conversion time is the total time between one conversion to the next. This encompasses all steps in the conversion process, from response of the photodiode, to the ADC conversion. This timing is included in the light integration time.

    As for the worst case timing, the spread of the conversion time can be +/- 10 percent. So, in the slowest case for each conversion time, you can expect an additional 10% on the total duration. This would be 880ms for 800ms, 440ms for 400ms, etc.

    Thanks,

    Daniel