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CDCE62005 LVCMOS TERMINATION PROBLEM

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Rolan Tang
Posted by
on May 05 2010 06:27 AM
Prodigy100 points

THE Application Report   SCAA096 tell us when the ref input  and output is LVCMOS, a 1K pull up resistor and  1K Pull down resistor are used, I wonder if they are  really needed? I think series resistor is more improtant.

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  • Sid
    Posted by
    on May 05 2010 07:22 AM
    Suggested Answer
    Genius4530 points

    Hi Rolan,

    Termination resistors are of 2 types - series termination and parallel termination.

    You can use series termination too (I have used it successfully in one of my projects).

    But the circuit suggested in AN is not a combination of pull-up and pull-down, it is a parallel termination circuit whose equivalent circuit  corresponds to resistance equivalent to that in case of series termination. (Although, I am not sure about the value variation, probably 100E would be better)

    Hope this helps.

    Regards,

    Sid

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  • Rolan Tang
    Posted by
    on May 05 2010 07:54 AM
    Prodigy100 points

    Sid, you mean you use series resistance  successfully with cdce62005 LVCMOS INPUT/OUTPUT?

     

    T&R,

     

    Rolan 

    clock LVCMOS CDCE62005 cdce62002 clock multiplier
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  • Sid
    Posted by
    on May 05 2010 08:10 AM
    Genius4530 points

    Yes Rolan,

    I have used series termination successfully on bot LVCMOS input & output.

    Havent faced any problems till now :)

    Regards,

    Sid

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  • Rolan Tang
    Posted by
    on May 05 2010 08:48 AM
    Verified Answer
    Verified by
    Prodigy100 points

    Thanks a lot! Rolan

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