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About multipoint LVDS design (power superimposed)

Guru 19645 points
Other Parts Discussed in Thread: SN65MLVD201, SN65MLVD206

Customer want to design Multipoint LVDS without ON/OFF (enable) control.

It's bidirectional, we thinking that ON/OFF control must use. 

Is it possible to take a measure using a power superimposed?

※Image is attached

If possible, is there an application note?

(I wasn't found.)

 

Best regards,

Satoshi

  • HI Satoshi,

    In theory this should work but at this time unfortunately I do not have any empirical data to support the design. We are currently tossing around the idea of assembling a TI design around this but have not put anything official together yet. We may have something out around mid year to support this though.

    The important parameters to consider when approaching this design are the input parameters of the MLVDS device. We need to make sure that they are not violated. Did you have a particular device in mind for this design? Once I know what device your are considering I can help to guide you through any pitfalls that may be unseen at this point.

    One problem that you may encounter during this design goes back to your comment in the initial post about the enable lines. How will you deal with turning the driver off and on when certain MLVDS devices are not communicating? There will be a bus contention problem if multiple nodes are trying to talk across the bus simultaneously.
  • Dear Michael-san

    Thank you for reply.

    Customer will use SN65MLVD201 or SN65MLVD206.
    Data speed is 50MHz

    ※Customer hope Bi-Directional line.
    (Only data line and VCC/GND, non-enable control)
    If impossible, A customer will consents it.

    Best regards,

    Satoshi