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LMH0340: Camera connection

Umberto Frangi
Expert 4045 points
Part Number: LMH0340
Other Parts Discussed in Thread: DS90CF388, DS90CF386

Hi,

 I have an application with a camera that provides 4 data+1 clock LVDS; this should be connected to LMH0340, that has 5 data+1 clock inputs.

Is there any problem or can we leave TX4 pair unconnected and still be  compliant to SMPTE 424M and 292M standards?

Any other suggestion for this configuration?
Thanks

Umberto

  • 0
    TI__Mastermind 29655 points
    Hi Umberto,

    If your camera is outputting 4 data + 1 clock LVDS, I am wondering if you are talking about CameraLink or OpenLDI instead of SDI protocols? Can you provide more information about the interface standard that is being used for the camera?

    Typically, cameras with 4 data + 1 clock output serialized that is 7-bits per clock cycle. In contrast, the LMH0340 takes in 5 data + 1 clock where there are 5-bits per 2 clock cycle (DDR signaling). Since this would be two completely different signaling types, can you provide more information about the camera output before moving further with the LMH0340?

    Regards,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    TI__Expert 4045 points

    Hi Mike,

     attached you find the camera datasheet and I guess it has SMPTE 274/296 interface(not 292/424 as anticipated.

    Now how do you suggest to implement  the physical interface to coax cable?

    Do you think a FPGA is needed to make protocol conversion?

    Thanks

    Umberto2515_FCB-EV7500.pdf

  • 0 in reply to Umberto Frangi
    TI__Mastermind 29655 points

    Hi Umberto,

    I looked at the camera datasheet, and from the specifications, it looks like they have an OpenLDI LVDS interface built into the camera:

    The LMH0340 uses a different interface than what the THC63LVD104C does, so this device cannot be used here. For this, I recommend looking at our Channel Link I or FPD-Link I devices, such as the DS90CF386 or DS90CF388. These devices use the same interface that is compatible with the THC63LVD827, and they support a 74.125MHz clock, which is what the FCB-EV7500 camera is providing. 

    Thanks,

    Michael