Driver Amp for a Log amp

David C

Other Parts Discussed in Thread: DRV134, DRV135

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 driver amplifier that can be used for this application?

Regards,

David

over 6 years ago

0 Thomas Kuehl over 6 years ago

TI__Guru* 93105 points

Hi David,

We have the DRV134 and DRV135 audio balanced line drivers, but I am not sure if their 100 kHz and the video performances are sufficient for the application. I suggest contacting the High-Speed Amplifiers group via their E2E forum. I expect that one of their fully differential amplifiers can fulfill the requirements. See:

www.ti.com/.../products.html

Regards, Thomas

Precision Amplifiers Applications Engineering

0 David C over 6 years ago in reply to Thomas Kuehl

TI__Expert 3350 points

Thank you for the help.

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Driver Amp for a Log amp