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ADS1220: Power AVDD to 5V and DVDD to 3.3V for ADS1220?

David Zhang
Prodigy 10 points
Part Number: ADS1220

Is there voltage difference limit between  Analog power AVDD and digital power DVDD? can I use 4.5V for AVDD and 3.3V for DVDD? since my analog signal input range is 0 to 4.096V

  • 0
    TI__Guru* 97835 points

    David,

    Having an AVDD of 4.5V and a DVDD of 3.3V should be fine.

    Any voltage difference limits between AVDD and DVDD would be listed in the Recommended Operating Conditions in the datasheet on page 6. You can see the power limitations below. There are limitations for the min and max values of AVDD to AVSS and the min and max values of  DVDD to DGND.

    The only min max values you need to watch for between the analog and digital supplies are from AVDD to DGND and AVSS to DGND. There will be come communication between the analog and digital side, and these are limits of the level shifting in the communication.

    Joseph Wu