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laser diode interface with afe

neelima g
Intellectual 490 points
Other Parts Discussed in Thread: AFE4404, AFE4490

Hello !

Can we interface laser diode sensor instead of LED sensor to afe4404/4490 ?

If not r any other afes supplied by TI for the same?

Thanks & Regards,

Neelima

  • 0
    TI__Mastermind 49746 points
    Hello Neelima,

    Can you provide the part number of the laser diode sensor?
  • 0 in reply to Praveen Aroul
    Intellectual 490 points

    Hi Amit!

    We have not finalized LD.Rough specs r as attached in excel.If u have testing any LDs, pl.let us know the part no. & corresponding afe.

    4682.PD.xlsx

    Thanks & Regards,

    Neelima

  • 0 in reply to Praveen Aroul
    Intellectual 490 points
    Hi Amit!
    I have not got any answer for my previous reply yet.So,again sending this query.

    We have not finalized LD. Rough specs r as attached in excel.
    If u have testing any LDs, pl.let us know the part no. & corresponding afe.

    e2e.ti.com/.../PD.xlsx

    Thanks & Regards,

    Neelima
  • 0
    TI__Genius 12575 points
    Hi Neelima,

    Following points should be considered while interfacing optical source with AFE4404/AFE4490.
    1) LED Driver is a constant current source between TX pin and GND. Current supplied as well as ON time of the LED Driver is programmable using register settings.
    2) There is a limit in current supplied by LED Driver. In AFE4404, its 50mA (with ILED_2X = 0) and 100mA ( with ILED_2X = 1). At any point optical source should not draw current more than this limit.
    3) Forward bias voltage of optical source should be such that, voltage at TX pin meets the headroom requirement of AFE4404/AFE4490.
    4) Maximum current supplied by LED Driver can have accuracy of +/- 15%. This might effect the threshold current of source.

    Hope this helps.

    Regards,
    Prabin