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LMK01000: Minimum Swing for Differential inputs when VBoost = 1

iConduct
Expert 5815 points
Part Number: LMK01000
Other Parts Discussed in Thread: LMK03000,

Team,


Can you please specify  the minimum swing for differential outputs on the LVDS and LVPECL pin pairs when Vboost is set to 1. Only the nominal is specified.

Your support would be greatly appreciated.

Regards,

Sem

  • 0
    Prodigy 10 points

    Thank you for setting up  this post. 

    We are using this part to drive a variety of different interface types in a microwave synthesizer. None of them are necessarily PECL or LVDS, so we are trying to understand what the minimum swing will be into 50 and 100 ohms differential at 125 and 250MHz out.

    also, we are severely space limited, what is the minimum recommended bypass capacitor usage?

    Thank you

    Jessica Kedziora

    KEDZIG Inc. 

  • 0 in reply to jessica Kedziora
    TI__Mastermind 27581 points

    Jessica,

    The Vboost bit adds about 40 mV in LVDS mode and about 55 mV in LVPECL mode, but to put a min/max spec in the datasheet, we would have to formally test for this condition.  As such, I can't guarantee these numbers for min/max.

    As per the LMK01000 datasheet, it seems to be lacking in typical performance curves. The LMK03000 datasheet ( www.ti.com/.../lmk03000.pdf) on page 13 has the same output structure design and does have more curves that show performance over frequency.  This should give you a much better idea of the variation to expect.

    Regards,
    Dean