• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 22 subscribers
  • Views 690 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CDCLVP1102 - Can this take an HCSL signal on the input pin and output an LVPECL signal?

Brian Gosselin
Expert 4745 points
Other Parts Discussed in Thread: CDCLVP1102, CDCLVP1204, CDCLVD1204

Hi Team,

Can the CDCLVP1102 accept an HCSL signal on the input pin?

Is there some sort of coupling and biasing/termination network that can be used?

The goal here is HCSL input into the buffer and LVPECL output.

Best Regards,
Brian Gosselin

  • 0
    TI__Mastermind 32575 points

    Brian,

    HCSL driver interface to DIFF input of CDCLVP1102.  The double termination attenuates the HCSL swing in half to stay within the differential input swing specifications.  Rb resistors are used to bias the AC coupled inputs within the input common voltage range.  This scheme would also work for CDCLVP1204/08/12/16, CDCLVD1204/08/12/16.

                                               0.1uF
    HCSL_OUT_P>--o--------(Zo=50ohm trace)------||-----o-->IN_P (CDCLVP1102    )
                 |                                     |
                 Rt=50ohm                              Rb=50ohm 
                 |                                     |
                 |                              0.1uF  |
                 o---|GND               GND |----||----o--<VAC_REF (CDCLVP1102)
                 |                                     |
                 Rt=50ohm                              Rb=50ohm
                 |                                     |
                 |                             0.1uF   |
    HCSL_OUT_N>--o--------(Zo=50ohm trace)------||-----o-->IN_N (CDCLVP1102)

     

    Alan