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INA333: INA333 input common mode vs Maximum output

Michele Costantino
Prodigy 10 points

Part Number: INA333

Hello, I am finding some discrepancy between the input common mode voltage range for the INA333 inamp described in the datasheet at page 10, fig 21 with respect of what I measure and see in simulation using the Tina TI software.

I would like to understand whether there my wrong interpretation of the datasheet specs or this could be indeed the case and I should refer to what I see in simulation. Thanks.

Regards,

  • +1
    TI__Mastermind 33723 points

    Hello Michele,

    Could you please describe your discrepancy? Please include the gain configuration, power supplies, and reference voltage. Alternatively, please provide a schematic with all these parameters visible or your simulation file.

    Additionally, what I like to do when looking at the input CM and output swing is to look at the necessary voltages in an ideal amplifier.Ideal_INA.TSC

    As an aside, there is also the VCM vs VOUT TINA sim, and there is the analog engineers calculator that can be used to check the VCM vs Vout of the INA333.

    Best,
    Gerasimos

  • 0 in reply to Gerasimos Madalvanos
    Prodigy 10 points

    Hello Gerasimos,

    Thank you for your prompt reply.

    The analog engineers calculator was the right tool for me to understand my interpretation of the datasheet was wrong when I extended Fig. 21 to my -0.5V to 5V supply. Of course there is no discrepancy and the tool is very useful.

    Many thanks indeed for your help.

    Best regards,

    Michele