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What's the output of LMH6554 when VEN =0?

Bruce Jiang
Intellectual 310 points
Other Parts Discussed in Thread: LMH6554

Is the Vcm still exit?

  • 0 in reply to Bruce Jiang
    TI__Mastermind 22825 points

    Hi Bruce,

    Here is what the datasheet states:

    "The LMH6554 is equipped with an enable pin (VEN) to reduce power consumption when not in use. The VEN pin, when not driven, floats high (on). When the VEN pin is pulled low, the amplifier is disabled and the amplifier output stage goes into a high impedance state so the feedback and gain set resistors determine the output impedance of the circuit. For this reason input to output isolation will be poor in the disabled state and the part is not recommended in multiplexed applications where outputs are all tied together."

    So, the outputs won't maintain the VCM as they would be in High-Z state.

    Hope this answers your question?

    Thanks,
    Hooman