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

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Replies: 3

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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

  • 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

  • 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

  • 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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