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SN74LVC1G125-Q1: Cable driver

K.Hamamoto
Guru 12155 points
Part Number: SN74LVC1G125-Q1
Other Parts Discussed in Thread: SN74LVC2G17

Hi

Our customer are considering to use this device for cable driver which is coaxial cable.

And the input signal is a SIN wave (condition: Fin=100MHz, Vin_pp=3Vpp, Vcm=+1.5V. Vdd=3.3V)

Is it possible to use this device at the above input condition? I think the logic device has some input slew rate specification.

So that, in my understanding it is not possible to allow a slow slew rate input signal such as sin wave. Is my understanding correct?

Regards,

Koji Hamamoto

  • 0
    TI__Guru* 96681 points

    Hello Hamamoto-san,

    You are correct, a slow input can cause shoot-through current, oscillations, and damage to the device.  Also, the output will be a square wave (if it functions properly under these bad input conditions).  If this is what they want, I would recommend using a Schmitt-trigger device instead such as SN74LVC2G17. I say 2G17 because it is necessary to parallel two outputs to achieve the required current for a 50 ohm terminated line (the voltage at the output will be about half of the input, but the signal should look pretty good).