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CDCI6214: Questions of CDCI6214

Jimmy Lai
Expert 6845 points
Part Number: CDCI6214

Dear Team,

Is there any way (programing) to adjust the output slew rate and rise/falling time?

We have failure slew rate at Y2 and rising/falling time at Y3.

Failure slew rate at Y2

Failure rising/falling time at Y3

Many Thanks,

Jimmy

  • 0
    TI__Mastermind 19800 points

    Jimmy,

    First, I should note - the slew rate and the rise/fall time go hand in hand. If the slew rate is decreased, and the voltage differential is the same, then the rise time must increase - they are inversely proportional.

    We specify a typical slew rate for LVDS, but not a minimum or maximum - what may be better is to consider setting the CDCI6214 for a different output format and using external components as needed.

    See the below image as an example for converting an LVPECL driver output to an LVDS signal for a receiver:

    The only difference here is that the 150-Ohm resistors would not be used on the LVPECL driver side. 

    The LVPECL swing meets the criteria, with the typical rise time reduced from 657 ps to 500 ps - this should be enough of a reduction to meet the standards.

    Thanks,

    Kadeem