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LMV721

Other Parts Discussed in Thread: LMV721

Hello,

This question is in regards to an LMV721 in a 3.3V single supply AC coupled inverting amplifier configuration with the non-inverting reference near 0.3V. Questions arise since the AC coupled signal will force a signal input that could exceed the maximum rail input voltages but will be current limited by 10k series R (I in/out max <500uA). Will this damage the amp? Why is there not a maximum input current limitation on the datasheet like many other amplifier datasheets?  Thank you very much.

Russell

  • Hi Russel,

    For whatever reason, they did not specify the min/max current. For the LMV series, ±10mA is pretty standard for Abs Max. But you really want to keep the current well below that. 1mA or less is better (add a minimum of 1kOhm per volt of over voltage).

    500uA should not cause any damage. That current is all being taken by the internal ESD clamp diode to V+, and not through the input stage, so no damage is being done to the input stage.

    Just beware that the LMV721 is not a R-R input and that input signals above 2.4V will be distorted or clipped.

    Regards,