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Original question:

[LMH1981] Settling time, Jitter and Lock

LMH1981: Input Specifications.

Harry Lum1
Prodigy 10 points
Part Number: LMH1981

Hi Team:

You have to pardon my ignorance.  The Vcc on my LMH1981 is 3.3 volts.  I am feeding the input (measured at pin 4) a 1 volt pk-pk NTSC color bars signal.  The back porch of the NTSC signal is at 1 volt.  Is this within the specifications.  And yes we have a 1uf cap between a buffer and pin 4.

Thanks,

Harry

  • 0
    TI__Genius 16845 points

    Hi Harry,

    This level is within specifications. The VIN-CLAMP level typ spec is 0.7 V (on datasheet pg. 3). The input sync pulse amplitude is typically 0.3V, therefore the input backporch level will be at about 1V (= 0.7V + 0.3V). I hope this information helps.

    Kind regards,
    Lane