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OPT4001-Q1: Inquires about OPT series

Yuto Kitamura
Expert 6635 points
Part Number: OPT4001-Q1
Other Parts Discussed in Thread: OPT4001

Tool/software:

Dear team,

Would you help me to understand about OPT sensors from TI?

1. What is the ADC topology of OPT4001? SAR, sigma-delta, pipeline

2. Does it have sample/hold, which means the output value is the average value of conversion time or instantaneous value?

3. If 2 is instantaneous, how can it achieve higher resolution by longer conversion time? I can understand if it is sigma-delta ADC.

4. How long does it take to ready to measure from powering up? = at the time VDD exceeds 1.6V?

best regards,
YK

  • 0
    TI__Expert 4480 points

    Hello Yuto, 

    1)Sorry we do not provide detailed descriptions of our device internals, but I have included a functional block diagram for the OPT4001 below:

    2 & 3) the OPT4001 can be configured to operate with light conversion times from 600μs to 800ms in 12 steps, providing system flexibility based on application need. Conversion time includes the light integration time and analog-to-digital (ADC) conversion time. Below is a table of available conversion times:

    4) Trigger to sample start from Low-power shutdown mode is 500μs

    Thank you, 

    Joseph Scherphorn

  • 0 in reply to Joseph Scherphorn
    TI__Expert 6635 points

    Hi Joseph,

    1), 4) clear. thank you.

    2) My question was, does the output data is the averaging value of conversion time or one value when start sampling? Please see below as an example.
    Arrows and vertical line indicate the sample timing.

    Best regards,
    Yuto

  • 0 in reply to Yuto Kitamura
    TI__Expert 4480 points

    Hello Yuto,

    Output value is average across conversion time. Choosing longer conversion times minimizes impact of noise. 

    Thank you, 

    Joseph Scherphorn