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DS90UB933-Q1: Connection mode

kevin.huang_FJXM
Expert 2925 points
Part Number: DS90UB933-Q1
Other Parts Discussed in Thread: DS90UB934-Q1, , DS90UB947-Q1, DS90UB948-Q1, ALP

1. Why are we used to using coaxial transmission on the camera side, similar to DS90UB933-Q1 and DS90UB934-Q1 applications

By default, the drive display uses differential signal transmission similar to DS90UB947-Q1 and DS90UB948-Q1, DS90UB927-Q1 and DS90UB928-Q1 applications

-----What is the problem with driving the display screen with a single ended coaxial cable?

2. If you want to test DS90UB947-Q1 and DS90UB948-Q1 eye maps without modifying the software, what are the methods

----Is it possible to directly connect CMLOUTP and CMLOUTN with a 0.1uF capacitor, and add the test tool to both ends of the 0.1uF capacitor to test the eye diagram?

3. Why only supply power to the deserializer (no signal)? RIN0 -, RIN0+will have waveforms as follows:

4. How the above waveform is generated.

  • 0
    TI__Mastermind 25765 points

    Hi Kevin,

    kevin.huang_FJXM said:
    -----What is the problem with driving the display screen with a single ended coaxial cable?

    I am not exactly sure what you are asking here. Are you asking if these devices can link Ser+Des using a coax cable?

    kevin.huang_FJXM said:
    ----Is it possible to directly connect CMLOUTP and CMLOUTN with a 0.1uF capacitor, and add the test tool to both ends of the 0.1uF capacitor to test the eye diagram?

    CMLOUT is not a great way to check for margin analysis. CMLOUT is only for rough checking data rate or gross issues on the line (zero crossings, etc). Using the MAP tool in ALP may be helpful.

    kevin.huang_FJXM said:
    3. Why only supply power to the deserializer (no signal)? RIN0 -, RIN0+will have waveforms as follows:

    Since the channel is bidirectional, there will be a signal sent by the DES in the reverse direction.

    Regards,

    Ben