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LMH5401-SP: Application Inquiry

Renan Santos Adriano
Mastermind 18495 points
Part Number: LMH5401-SP

Hello Team,

My customer has a question about LMH5401-SP. Can you apply a signal to the "IN_P" and "IN_N" pins prior to the part powering up?

Regards,

Renan

  • 0
    Guru 271300 points

    The absolute maximum ratings forbid input voltages outside the (VS–) – 0.7 V … (VS+) + 0.7 V range.

  • 0
    TI__Mastermind 24325 points

    Hello Renan,

       For almost all devices, it is always recommended to power the devices before applying a signal at the inputs. As Clemens mentioned, the input and output voltages must be within a defined set of rails. The reason is to avoid turning on the internal protection of the amplifier which will conduct current via ESD diodes and may cause damage or latch-up in the device.

       However, EOS events or accidents happen; damage can be prevented with additional external protection and series limiting resistors at the input of the amplifier. One of the most critical requirement here is keeping the continuous input current under 10mA into the amplifier which is regulated by these series limiting resistors. For external protection, I would recommend adding diodes with lower forward drops than 0.6-0.7V from the input of the amplifier to each of the power supply rails. 

       In general, the amplifier might be functional depending on the power and time of the signal at the inputs of the unpowered amplifier, but protection is always recommended in this situation.

    Thank you,
    Sima