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LMP2011 Input Common-Mode Voltage Range

David Wang5
Prodigy 70 points

Other Parts Discussed in Thread: LMP2011, TINA-TI, LMP2021

Hi all,

    Is there anybody who can help provide me the parameters of  ' Input Common-Mode Voltage Range‘ under 5V supply voltage for LMP2011?  When i simulation it with  TINA-TI,Flat-top distortion could be seen in the 3.4V Vcm, it's Vcm only 3.3V or smaller? thanks in advance!

  • 0
    TI__Mastermind 45250 points

    David,

    The device has a rail-to-rail output, but the input is limited to a range of 0V to 3.2V for a +5V supply.

    The input common-mode range isn't stated explicitly, but it shows up in the data table as a condition for the CMRR spec. You can also see this in the graph of input bias current versus VCM on page 5 of the data sheet. Once the VCM goes above ~3.2V (with a +5V supply) the bias current begins to debgrade quickly, which indicates the input stage is being forced outside its normal range of operation.

    Richard Elmquist

  • 0
    TI__Guru 66646 points

    Hi David,

    Richard is correct. The input common mode voltage range is not stated implicitly in the table, but it can be inferred from the CMRR conditions and from the graphs.

    The LMP2011 was our second generation part, so the upper VCM limit is about 1.8V below the V+ supply.

    If you need more headroom, the latest generation LMP2021 can go to 0.8V below V+.

    Regards,

  • 0 in reply to Paul Grohe
    Prodigy 70 points

    Hi Richard and Paul,

       Great! thanks for your reply.

       Regards,David