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THS4551: Driving Strength

Balakrishnan Kumar
Prodigy 250 points
Part Number: THS4551
Other Parts Discussed in Thread: THS4561

Hi 

We are using THS4551 IC, The output is connected to the 5meter of cable . Is it able to drive the signal to 5meter of cable ?

Regards

Bala

  • 0
    Guru 47485 points

    It can if you isolate the capacitance with a matching resistor. 

    What speed is your signal, what is your final load, are you using Twinax? 

  • 0 in reply to Michael Steffes
    Prodigy 250 points

    Hi Michael, 

    Speed is very less as its input is derived from Hall sensor and cut off frequency of filter (-3db = 270KHz)

    THS4551 amplifier output signals are transferred through the shielded differential cable of 5 meter length, not the Twinax also note its not a single cable length, one cable has 2 meter and other one has 3 meter)

    ADC is the load, but we have a 2nd order Butterworth filter before the ADC. 

    I'm attaching the image of THS4551(unity gain), As of now we added 0 ohm series resistor, based on cable impedance series resistor values will be finalized, Can you please check and comment any additional components to be added due to long cable path

    Regards

    Bala

  • 0 in reply to Balakrishnan Kumar
    Guru 47485 points

    well you can't drive the cable directly as it looks capacitive, would need the ADC input filter ckt, eventually you need some series output R, an estimate of the cable C or it differential characteristic impedance. You can either do doubly terminated and take a 6dB loss, or treat the cable as a C and work that into your response simulation. You can recover the insertion loss with added gain in the FDA - why use such a fast part, it is very good noise for the power, but you might also look at the THS4561.