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OPT3101: OPT3101 maximum range, modulation frequency, and external laser diode driver

Prodigy 70 points
Danlin Xiang

Replies: 3

Views: 116

Part Number: OPT3101

Hello,

I am interested in OPT3101 for one of our rangefinder project. The measurement range is from 10m to 1km at 2 ~ 3 readings per second.

From the OPT3101 de-aliasing app note and the distance calculation equation, it seems the maximum distances with de-aliasing enabled are 75m or 115m depend on the 2nd modulation frequency selection. Is there a workaround to extend the distance, assume the optical design and eye safety are not the limiting factors? Can the default modulation frequency be changed from 10MHz?

I will likely use a Vcsel diode at higher current than the OPT3101 internal diver could support. Any suggestion on extend the emitter driving capability of the chip?

Thanks,

Dan

Prodigy 70 points
Danlin Xiang
  • Mastermind 19010 points
    Alex Bhandari-Young

    Hi Dan,

    If you are asking how to extend past 115m this is not possible with the device.

    For exceeding the drive current you can use an external driver.

    Best,

    Alex

  • Prodigy 70 points
    Danlin Xiang

    In reply to Alex Bhandari-Young:

    Thanks Alex!

    I am looking into TDC7201 datasheet and app notes. Seems it's less integrated, but more flexible, and good for measuring longer ToF. 

    Do you have a reference design based on TDC7201 for a long range Laser rangefinder? Any other ToF chips that you would recommend?

    Thanks,

    Dan

  • Mastermind 19010 points
    Alex Bhandari-Young

    In reply to Danlin Xiang:

    Hi Dan,

    Please see here https://www.ti.com/tool/TIDA-060025

    This is fiber based but may be a good starting point.

    Best,

    Alex

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