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Original question:

LMH6703: Input Voltage Range

LMH6703: LMH6703

Luca Toscano
Prodigy 80 points
Part Number: LMH6703

HI

It means LMH6703 can accept ±2V input signal at ±5V supply voltage but with a CMRR<40dB. And at ±6V supply voltage CMRR inproves respest to ±5V.

Is this understanding correct?

Regards,

L.

  • 0
    Guru 140200 points
    Hi Luca,

    there are two specifications in the datasheet:

    1. For a common mode input voltage range between -1.0V to +1.0V the common mode rejection ratio is better than 44dB (full temperature range).

    2. For a common mode rejection ratio of >=40dB the guaranteed common mode input voltage range is +/-1.9V minimum (25°C junction temperature).

    Kai
  • 0 in reply to kai klaas69
    Guru 47485 points
    Hi Luca,

    The LMH6703 is a current feedback device where (way back in the beginning) we tried to provide an equivalent CMRR spec to VFA. That arises in this case from a buffer gain loss across the inputs. You can see this most easily by running a 4 equal resistor set up with a common mode input and look at the output. Delved down into the CMRR thing quite a bit in this article - turns out VFA op amps have an almost random polarity in their models - probably not your question, but I thought that was interesting.

    www.planetanalog.com/author.asp