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AMC1200: AMC1200 output common mode voltage 1.29V

Annie Liu
Genius 10295 points
Part Number: AMC1200

Hi Team,

AMC1200 output common mode voltage 1.29V. The customer would like to know if he inputs VDD2 as a positive or negative voltage, can 1.29V become 0V?

Thanks,

Annie

  • 0
    Guru 140200 points

    Hi Annie,

    I haven't understood your question. Can you please explain in more detail?

    Kai

  • 0
    TI__Mastermind 47625 points

    Hi Yuan,

    This may be possible but we cannot guarantee the device behavior when operated in this way since it has not been fully tested. I spoke with a member of the design team and there are some concerns, especially with the common-mode output voltage. If you look at the device datasheet, you will see that the common-mode output voltage is typically 1.29V, but has a minimum of 1.15V and maximum of 1.45V. Any variation in common-mode output voltage would result in a direct offset error if sensing in a single-ended manner.

    To summarize, operating the device from unipolar supplies is best and using an operational amplifier for level shifting and differential to single-ended conversions is best. 

    Please let me know if you have additional questions.