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LMH3401: Output common mode voltage

Lee Szymanski
Prodigy 90 points
Part Number: LMH3401
Other Parts Discussed in Thread: LMH6554,

I'm looking at replacing the LMH6554 with this faster amplifier. According to the datasheet I can set the output common mode voltage to within 2V of the positive voltage rail. The test condition states "differential gain shift < 1dB", is this linear? or non-linear gain compression? I haven't seen this caveat on other devices.  The graph on page 11 of the datasheet indicate a very low distortion response.

The application will drive 1Vpp into a 200ohm differential load with 1.9V Vcom. Powered from +4 and -1V25 rails.

Regards

Lee

  • 0
    TI__Genius 15975 points

    Hi Lee,

    The test condition for output common mode voltage "differential gain shift <1dB" is a linear gain specification.

    I think you should be okay on the output common mode voltage of 1.9V Vcom, when operating the LMH3401 from +4 and -1V25 rails. Your output common mode voltage is only 0.525V (= 1.9V - 1.375V) shifted from the mid-point which should be fairly linear region to operate the LMH3401 output common mode voltage.

    Best Regards,

    Rohit