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Comparator for restoring 27MHz clock from sine signal.

Adam Pelc
Prodigy 20 points
Other Parts Discussed in Thread: TLV3501, LMV7219

Hello,

I'm looking for comparator that allowes me to restore 27MHz clock from sinusoidal waveform ( min. 100mVpp ). I'm struggling with finding one because it's low power solution, so maximum quiescent current suppose to be around 1mA, and minimum supply voltage around 2V7 / 3V0. Are you familiar with any solution that meets the requirements? Thank you for any help.

Best regards,

Adam Pelc

  • 0
    Prodigy 20 points
    *min 100mVpp - input sinusoidal voltage
  • 0 in reply to Adam Pelc
    TI__Expert 4555 points

    Hi Adam,

    What is the full input range of your sinusoidal signal? I want to make sure the device can handle the full amplitude of the signal you plan to feed it.

    For push-pull output, The TLV3501 could be a good choice. It has 325uA quiescent current, with Supply range of 2.7V-5.5V. Input Common mode range is 200mV below your V- supply; Assuming V- = GND in your application, the part should handle the min 100mVpp sine wave.

    To calculate Max Input Frequency a device can tolerate, the formula is:

    1/(tr + tf + tplh + tphl)

    For this device, the max input frequency it can toggle at is 37MHz which should fit your need, assuming you match the worst case test conditions from the datasheet. 

    Regards,
    Jonny

  • 0 in reply to Jonathan Nguyen
    Prodigy 10 points

    Hi Jonny,

    thank you for help. One thing, you wrote that TLV3501 has 325uA quiescent current, however at datasheet there is info about typical 3.2mA up to 5mA. Why such a difference, or I missed something?

    Best regards,

    Adam

  • 0 in reply to Adam Pelc12
    Guru 140200 points
    Hi Jonathan,

    quite certainly Jonathan wanted to say 3250µA. See the supply current at 5V supply voltage in figure 11 of datasheet.

    Kai
  • 0 in reply to Adam Pelc12
    TI__Expert 4555 points

    Hi Adam,

    Sorry about the confusion. Yes, the TLV3501 does have 3.2mA Iq @5V supply, I misread the units here and I apologize.

    The closest device that could meet your needs is the LMV7219. It has 1.1mA typ supply current at 5V, and can switch at a range of about 40MHz assuming typ specs. However, the worst case Max switching conditions for this device is roughly 23MHz. It is up to you to decide whether this would be acceptable for your application or not.

    Regards,
    Jonny