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Interface video sensor to processor

Ilya Angelov
Prodigy 20 points
Other Parts Discussed in Thread: DM388, DM385

Hello! I'm starting to develop a video camera for endoscopy. I'm starting to collect information about the interfaces for the remote data transmission from the sensor to the processor. The length of the cable should not be more than 3.5 meters. The sensor has interfaces: Mipi csi-2, parallel output and sub lvds. I expect transducers or transceivers to be needed. Maybe you can tell me how best to connect a video sensor to the processor at such a distance? What is the most optimal?

I plan to use sony imx 322 LQJ.

  • 0
    TI__Mastermind 18655 points
    Hello Ilya,

    Could you please confirm what kind of interface will support your processor?

    For MIPI CSI-2 you can use DPHY440 which is a MIPI DPHY re-timer that regenerates the DPHY signaling.
    The device compensates for PCB, connector, and cable related frequency loss and switching related loss to provide the optimum electrical performance from a CSI2/DSI source to sink.

    Regards
  • 0 in reply to Joel Jimenez0
    Prodigy 20 points
    Thank you for your answer. I planning use the DaVinci DM388 or DM385. And distantion must be about 3.5 meters between sensor and processor.
  • 0 in reply to Ilya Angelov
    TI__Mastermind 18655 points

    Hello Ilya,

    The DPHY440 supports up to 4dB EQ on its Rx and 2.5dB DE on its TX. These features were intended to some extent to compensate the ISI loss in the channel.
    If you can measure or simulate the degraded eye diagram, you should be able to get an idea of whether one DPHY440 would be able to compensate the ISI for this 3.5m cable.
    As a repeater, DPHY400 is also intended to eliminate the timing skew due to channel differences. As long as the input timing within DPHY440’s spec requirement, it is able to re-align clock and data to improve the system’s timing margin.
    Two DPHY440 can be cascaded.
    Please, take a look at the 8 Application and Implementation section in the device datasheet which states the design procedure based on a certain data rate and cable loss profile.

    Regards,
    Joel