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ONET1101L: How to connect the chip input signal DIN+ / DIN

Adah-Zhao
Prodigy 30 points
Part Number: ONET1101L

Hello，

I want to use the ONET1101L chip to drive the laser diode. In the process of looking at the datasheet, I saw that the input terminal DIN+ and DIN- are forward input terminal and reverse input terminal respectively.
I want to know:
1. Is this input signal a pair of differential signals?Can the single-end signal be triggered?If yes, how should I connect the two pins?
2. What is the effect of the level of DIN+ and DIN- on the chip pin MOD+ and MOD-, and what is the effect on the driving laser light?
If possible, please provide a design specification.

  • 0
    TI__Guru* 91710 points

    Greetings,

    1). You are correct these are differential signals. It is preferred - for better noise immunity - 

    2). DIN+ and DIN- is used to modulate or drive MOD+ and MOD- pins.

    Regards, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 30 points

    Thank you for your reply, I would like to know more about it.
    1. Does the pulse signal I input need to be converted from single-ended to differential signal before input into DIN+ and DIN-? Is there any chip recommended?Do I need to add terminal matching resistor or pull-up resistor when inputting the input signal?
    2. Can this chip be configured into continuous output mode through registers instead of single pulse output?

  • 0 in reply to Adah-Zhao
    TI__Guru* 91710 points

    Greetings,

    This part is typically used for communication such as ethernet or fiber channel applications with 8b/10b coded data or PRBS patterns. Therefor it is not used in applications to provide pulse response. Also, please note the output is AC coupled in the data sheet.

    This part does not have a way to generate continuous data pattern or pulses on its own.

    Regards, Nasser