I want to use AD9513 to give clock to another IC with a min voltage requirement of 800mvp-p single ended clock. want to understand if i convert LVDS to single ended will i be able to support 800mVp-p single ended?

thanks in advance

  • 0
    •  Analog Employees 
    on Feb 14, 2012 8:21 PM

    Dear Goal,

    Yes, it's possible to AC-couple and re-bias the DC voltage, or use a transformer to accomplish what you're trying to do.

    However, if the frequency isn't too high, I'd just use the CMOS output with a voltage divider, or use one of the parts from the AD9512-AD9515 family with an LVPECL output.

    -Paul Kern

  • Thank you for the response. AD9513 datasheet gives LVDS output of 450mV max. So when this LVDS converted to single ended through a transformer, will the single ended voltage will be 800mvp-p? sorry to ask again.

    CMOS i do not want to use since the length of the AD9513 output is more than 3 inches.

    Yes it is better to use AD9514 with LVPECL outputs converted.

  • 0
    •  Analog Employees 
    on Feb 15, 2012 1:34 AM

    If you use a 1:1 transformer, and ground one of the output taps, the other output of the transformer will be ~800 mVpp. At that point, you will need to re-bias the DC voltage.

    However, it's far easier to use LVPECL or CMOS. If the output frequency is < 200 MHz, then using CMOS for traces up to 6" (or more) should be fine. We've seen traces far longer than this and it's been fine. It really depends on the application and how sensitive the rest of the components are on your board.

    As you say, though, LVPECL is the best overall. Just be sure to terminate both legs of the LVPECL output the same way.

    -Paul Kern