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DS90UB913A-Q1: Spliting the FPD-Link III signal

Lukas Henkenjohann
Prodigy 10 points
Part Number: DS90UB913A-Q1
Other Parts Discussed in Thread: DS90UB914A-Q1,

Hello,

I have a camera which sends the data to a ds90ub913a-q1 to generate a Power over Coax (PoC) signal to transfer it over a coax-cable to the ds90ub914a-q1 on another printed circuit board. Due electromagnetic issues we want to replace the coax- cable with twisted pair cables.

So we have to build a connector which converts the PoC signal to a differential signal. Now we want to split the PoC signal with filters into different signals. The power, the video data and the I2C control signal. So we want to use Single-ended-to-differential converters to create differential signals. The problem is the bidirectional I2C. We want to split the I2C with filters into a forward part (from 913a to 914a) and a backward part (from 914a to 913), but we don’t know the frequency of the forward I2C and the backward I2C.

Is this solution possible and if yes, can u please tell me the frequency of the I2C working on?

Best Regards

Lukas Henkenjohann

  • 0
    TI__Guru** 103215 points

    Hello Lukas,

    The question is quite confusing but FPD-Link III devices like 913A/914A already support differential mode transmission. You can reference the datasheet for how to set it up from the board design and electrical standpoint. That would be the appropriate way to implement twisted pair cabling rather than converting from single ended to differential after the 913A/914A driver circuit (in which case most likely the link will not work correctly because the bidirectional channel echo cancellation will be broken). 

    Best Regards,

    Casey