• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 32 subscribers
  • Views 718 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS15EA101 - Interfacing LVDS input

Kawai
Guru 19775 points
Other Parts Discussed in Thread: DS15EA101, DS30EA101, DS92LV0422

Hi Team,

I have a question when connecting DS15EA101 output to LVDS receiver.

Could you please help us on the following question ?

[Q1]
It seems DS15EA101 has, VOD=750mV(TYP) and VCM = 3.3 - 0.375 = 2.925V(TYP)
In the datasheet page 5, Figure 1 shows it could interface LVDS receiver with DC coupled.

I think this would be true if the LVDS receiver has wide input common mode range.
Am I correct ?

[Q2]
Why does DS15EA101 has VOD=750mV and VCM=2.925V, instead of LVDS standard level (VOD=350mV, VCM=1.2V) ?

Best Regards,
Kawai

  • 0
    TI__Guru* 93670 points

    Hi Kawai-San,

    DS15EA101 has CML output and it is referenced to 3.3V and this is why you see VCM = 2.9V. If you have an LVDS receiver with wide dynamic range then as you said you can DC couple. 

    If you must have LVDS output then perhaps you can consider DS30EA101 instead.

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Guru 19775 points

    Hi Nasser-san,

    Thank you for the comment.

    I understood DS15EA101 has CML output.

    Our customer is considering to use DS15EA101 and DS92LV0422 for receiver side.

    When interfacing these two devices, I believe you could connect them by just AC coupling.

    Please let me know if there is anything you should be careful.

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    TI__Guru* 93670 points

    Kawai-San,

    I agree we have to AC couple these since DS92LV0422 needs 1.2V common mode voltage.

    Please note in the data sheet it recommends 0.1uF AC coupling Cap. I think this is because of 8/10bit coded data patterns. If in this customer application they have lower transition density then they may need to increase the Cap value.

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Guru 19775 points

    Hi Nasser-san,

    Thanks for the information.

    Best Regards,
    Kawai