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Delaying low voltage pulse

Category: Hardware
Product Number: LTC6994IS6-2#TRMPBF

Hello all,

I would like to delay a pulse waveform by some specific amount of time (a few us). I was looking at this delay line IC:

www.analog.com/.../LTC6994-1-6994-2.pdf

The issue is that most of these delay lines seem to use TTL logic as the input, however my input signals would instead be small voltage pulses, only ~10 mV amplitude. Does anyone know if this would work? If not, are there any delay line ICs which can delay pulses of this size? Preferably something with an adjustable delay time?

Thanks for reading!

  • Hi,



    About the input level of LTC6994-1, you are right. Input signal level must exceed 0.7*Vdd and must drop below 0.3*Vdd. If the signal is low frequency and digital, you can use an opamp to convert it to TTL logic. 

    What is your frequency? ADI has clock distribution ICs that can help you achieve adjustable delays. You can check LTC6953 and LTC6954 ICs.

    Regards,
    Emrecan

  • Thank you for your response! My signal is single pulses (not periodic) that come ~1/sec, with a pulse width of ~500 ns, and ~10 mv peak to peak. Is this something an op amp could convert to TTL?

    I see these ICs have a minimum input amplitude of 200 mV, my signals are an order of mag below that. And the issue with amplifying them is that I have 64 of these signals coming in, so trying to minimize cost and complexity.

  • Hi,

    The minimum delay of LTC6994-1 is 1us. Therefore Pulse width must be larger than 1us in order to delay the signal. Unfortunately, LTC6994-1 can not be useful in your configuration.

    Regards,
    Emrecan