• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 2 answers
  • Subscribers 48 subscribers
  • Views 356 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.

LMV7219: Maximum input signal frequency

Luciano Calaça
Prodigy 20 points
Part Number: LMV7219


Tool/hardware:

Hi,

This component is intended to be used as a zero-crossing detector.

Can someone please clarify the maximum input signal frequency for the LMV7219M5? I cannot find this information explicit in the datasheet:

LMV7219 7-ns 2.7-V to 5-V Comparator with Rail-to-Rail Output datasheet (Rev. I)

Currently, there is the below assumption:

max_freq = 1 / ( 2 * ( propagation_delay + rise/fall time)) = 1 / (2 * (7 ns + 1.3 ns) ~ 60 MHz.

Is this assumption correct?  Thanks in advance.

Best regards,

Luciano.

  • 0
    Guru 317870 points

    The propagation delay is measured from 50 % of the input edge to 50 % of the output edge, so you should not add up the propagation delay and the rise/fall time.

    You can use the propagation delay alone (1 / (2 × 7 ns) ≈ 71 MHz). The output signal will continue to go to the rail before the output switches back.

  • 0
    TI__Genius 11905 points

    Hi Luciano,

    It doesn't seem like the LMV7219 has a maximum toggle frequency on the datasheet.

    The way we estimate the toggle frequency is using this equation:

    Please note that the resulting value from this estimate is not guaranteed by the datasheet and that you should add a margin of 20% to 30% to allow for device to device variations.