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Maximum input voltage on LMH6553

Brad Ramshaw
Prodigy 10 points
Other Parts Discussed in Thread: LMH6553

What is the maximum differential input voltage that the LMH6553 can safely handle and then recover from?

I have an experiment where I drive a line with pulses of 500 MHz RF at around 10 Vpp. I then need to amplify small transient voltages on that same line (echoes, akin to pulsed NMR) and feed that to an ADC. 

I currently use switches in front of my amplifier which i turn off while driving the line with 10 Vpp so as not to saturate the amplifier. However, if LMH6553 could handle 10s of volts on its input, clamp the output to say 2 V, and then recover in 600 ps, this would be much simpler.

Thoughts?

  • 0
    TI__Genius 13935 points

    Hi Brad,

    The maximum differential input voltage is around 2V. 

    There are diodes that protect the LMH6553 inputs from a large differential voltage.  These diodes are designed primarily for ESD protection, so they can only handle 10mA of continuous current.  If your source resistance is high enough that only 10mA will flow into the input pins during an over voltage event then the amplifier won't be damaged. 


    I don't know what recovery time would be.

    Regards,
    Loren