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Driver Amp for a Log amp

David C
Expert 3350 points
Other Parts Discussed in Thread: THS6182

Hello,

I am working on a ‘video circuit’ that takes the output of a Log Amp, adjusts Gain and offset, and drives the signal differential over twisted pair wires. The output differential driver must drive 50 ohms. Assuming the twisted pair characteristic impedance is 100 ohms, I will place a 100 ohm resistor across driver output. I must drive the differential pair +/- 1V. Accounting for a back termination, the driver should be able to drive +/- 2V.

 

The Log Amp output will be from DC to perhaps hundreds of Kilohertz. Differential video output rise time must be < 30ns. Fall time < 100ns. Recovery time < 250ns.

 

Do we have a solution that can be used for this application?

Regards,

David

  • 0
    TI__Expert 7875 points
    Hi David,

    Depending on you power limitations, you might actually be able to use one of our DSL line drivers that were designed specifically for driving twisted pair copper. You could start with something like the THS6182 which can output 600mA of current and see if that would work in your circuit. My biggest concern is the recovery time since I don't believe it was measured on that device.

    Regards,