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DS99R421-Q1: Eye Diagram

Daniele Loperfido
Prodigy 60 points
Part Number: DS99R421-Q1
Other Parts Discussed in Thread: DS99R421

E2E members,

I would like to validate the FPD-Link II beetween  DS99R421 and D90UR124.
 Could you tell me which  measure are necessary?
 Should I measue eye diagram according pag. 8 of the datasheet? Do you have a procedure for this type of measurement?

Regards,

  • 0
    TI__Mastermind 19720 points

    Hi Daniele,

    The DS99R421 is not recommended for new designs so please do not use this for a new device. If this is an older design, to validate the FPD-Link II link you can disable or desolder the D90UR124 on your system and then hook up a high impedance diff scope probe to the RIN+/- lines of the device. Next apply your LVDS signal to the input to the DS99R421, then use these diff scope probes to generate an eye diagram of the FPD-Link signal. Then follow section "9.2.1.2.3 Transmission Media" of the D90UR124  datasheet to verify that your system meets the D90UR124's requirements.

    Regards,

    Michael W.