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LME49724 150 ohm drive capability

volkan serter
Prodigy 80 points
Other Parts Discussed in Thread: LME49724, THS4140, OPA1632

I am trying to drive 150 ohm load with LME49724 with +-12 V supply. My target output swing is 17V peak to peak. I use the TINA example schematic from the website.

But in the model it clips the output for 150ohm load. Is this amp capable of driving this load with the 17V swing?

If not , any amplifier you can suggest?

  • 0
    TI__Intellectual 1780 points

     

    Hi Volkan,

    I'll try to simulate this and get back to you late today or Monday morning.

    Best Regards,

    -Harini :-)

  • 0 in reply to Harini Sankabattula
    TI__Intellectual 1780 points

    Hi Volkan,

    I looked at the LME49724 datasheet, it looks like the minimum load you can drive using this opamp is 600Ω. So, if we use a load lower than the minimum spec, the output would clip and linearly scaling supply & load wouldn't work.

    Let me know (all of) your requirements and I'll try to find a part that works for you.

    Best Regards,

    -Harini :-)

  • 0 in reply to Harini Sankabattula
    Prodigy 80 points

    Thank you for the answer.

    My requirements are,

    To drive 150 ohm differential output with 17 Vpp output swing. Supply voltage can be +-10 or +-12 or +-15 ,etc.

    Input signal to the amplifier is either differential and 4Vpp max or single ended and 2Vpp.

    Signal frequency is up to 20 KHz

    I simulate THS4140 and OPA1632 as well. In the simulation results, there seem to be no problem. But in the datasheets drive capabilities seem much less with respect to simulation.

    Regards,

    Volkan