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Original question:

OPT3101: OPT3101 photo diode input circuit description and spice model

OPT3101: optical device placement

Adrian Liu
Intellectual 2450 points
Part Number: OPT3101

Tool/software:

Hi Team,

As  the title says, how far can external optical devices(LED and photodiode) be placed? I saw in the 10.1 section of the D/S that the closer the better. Do we have more specific requirements?

BR

Adrian

  • +1
    TI__Intellectual 830 points

    Hi Adrian,

    The photodiode needs to be as close as possible to the IC. You can refer to the OPT3101EVM part to get idea on the placement of LED and photodiode. Document "Introduction to Time-of-Flight Long Range Proximity and Distance Sensor System Design" chapter 7 has more details on optical design and chapter 8 shows layout of optical devices. 

    We can also help to review the PCB. 

    Thank you.

    Wenjuan