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INA149: Clarification of common mode range when using single +12V supply

John Saunders
Prodigy 165 points
Part Number: INA149


Tool/software:

Figure 3 of the data sheet for INA149 shows common mode range for various + & - supply voltages.  I will use a single supply at 12V instead.  Does that mean 
I still get the same + common mode voltage support as is shown for +/-12V?  I need to handle a max common mode voltage of 41.5V in my circuit.  Thank you.

  • +1
    TI__Mastermind 33583 points

    Hey John,

    Thank you for asking your question on E2E! The common mode range at single 12V supply should be in line with the +/-6V section, however, care must be taken to ensure your amplifier inputs are in an acceptable common-mode range. Where you set your input values and REF value will dictate this.

    Here is a TINA Simulation file that can take the supplies, REF, CM voltage, and differential input voltage, and ensure that your valid common mode range is retained.

    https://www.ti.com/lit/tsc/sbombk9

    There are instructions in the file, but as long as the input common-mode voltage on both inputs of the left-hand (real) amplifier aligns with the right hand (ideal) amplifier, the INA149 should be in a satisfactory linear operating range.

    Best,
    Gerasimos