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Comparator selection

Liu Yang
Genius 10265 points

Other Parts Discussed in Thread: TLV3201, TLV7011

Hi team,

The initial signal is 0-5V triangular wave that belongs to small signal, I need to compare the triangular wave to a fixed voltage value every time, if it lower than the fixed voltage value, the comparator can output the initial signal, but the fixed voltage value maybe set different every time. I need the comparator have little noise meanwhile.
Could you recommend a chip to suit this design?

Beat Regards,
Tom Liu

  • 0
    Guru 140200 points

    Hi Liu,

    what is the frequency of this triangular wave?

    What do you exactly mean by the sentence: "The initial signal is 0-5V triangular wave that belongs to small signal."? Is the 0-5V triangular wave this small signal itself? Or is there anything else in the signal?

    Kai

  • 0 in reply to kai klaas69
    TI__Genius 10265 points

    Hi Kai,

    The initial signal (0-5V triangular wave) is the analog small signal itself.
    It's frequency lower than 10KHz.

    Beat Regards,
    Tom Liu

  • 0 in reply to Liu Yang
    TI__Mastermind 27460 points

    Tom

    it sounds like you are requesting a simple zero cross detection circuit.

    Depending on the accuracy you require, we have several different comparators for you to consider with different response times.

    10kHz is relatively slow, so depending on the timing accuracy requirement of your system, you can use the TLV7011 (260ns prop delay) or the TLV3201 (40ns) prop delay.  We have slower devices as well but you did not mention if power consumption is a concern.  The faster devices consume slightly more power.

    Here is an app note on zero cross detection as well for your reference.

    Chuck

    www.ti.com/.../snoa999.pdf