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ONET1141L: Register Question

Part Number: ONET1141L

Team,

I have a customer that is working with the ONET1141L. They have a question a about the register 1, bit 4: "High Modulation Current enable bit".

What does this mean exactly? What is the effect to register 2,3 where the modulation current is set?

The customer will use the part in a 35Ohm transmission line at the output of the ONET1141L and wants to have here a 2Vpk-pk amplitude by increasing the modulation current. How would they do this in the registers?

Thanks and Regards,

Mihir Gupta

FAE - South Germany

  • Hi Mihir,

    I'm looking into this with our team- will get back to you very soon.

    Thanks for bearing with us.

    Regards,

    Sri

  • In reply to Sriharsha Kota Pavan:

    Hi Sri,

    Do you have an update for me?

    Thanks and regards,

    Mihir

  • In reply to Mihir Gupta65:

    Hi Mihir,

    Yes, I just heard back from our team on this:

    The "high modulation current enable" (HCENA) bit increases the bias current for the ModCurrent DACs by 25%, which means that the modulation o/p voltage (MAX) as well as the step size increases correspondingly for the same register settings of Reg 2 & 3.

     

    If the customer wants to achieve 2Vpp SE with, we recommend them to set the HCENA = 1 and use a register setting of MODC = (800)10 or (810)10 according to the Fig. 14 in the Datasheet of ONET1141L.

     

    Hope this helps, please feel free to ask any further questions. 

    Thanks,

    Sri

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