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LVPECL clocking for ADC ADS5474

Bhupesh Patil
Intellectual 440 points
Other Parts Discussed in Thread: ADS5474

Can I use LVPECL clocking for ADC ADS5474?  As clock pins are internally biased to Vs/2, I need to terminate LVPECL driver first and then AC coupling? AM I doing right thing?

  • 0
    TI__Expert 6040 points

    Bhupesh,

       You can use LVPECL clocking the ADS5474 since differential clock amplitude can be down to about 0.5Vpp mentioned in the data sheet. Clock pins has common-mode voltage 2.4v internally biased (mentioned in the data sheet). Yes, you are right to terminate LVPECL driver and use AC coupling between two devices.

    Regards,

    Qing

  • 0 in reply to Hui-Qing Liu
    TI__Expert 6040 points

    Bhupesh,

       Just wanted to make correction from previous message about the Vcm, the Vcm 3.1v mentioned in the previous answer is for analog input pins (internal biased), the Vcm for clock input pins is 2.4v internal biased (fig 40 in the data sheet). 

    Regards,

    Qing