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ADS1244 grounding wire

hj
Intellectual 650 points
Other Parts Discussed in Thread: ADS1244

Hi, Just as a clarification, should I have the ground wire on the ADS1244 attached to digital ground or analog ground?  I have both on my circuit and I didnt know if it mattered or not which ground I was attached to

  • 0
    TI__Guru** 113765 points

    Hi HJ,

    For the ADS1244 there is the potential for two different supplies, AVDD and DVDD.  AVDD is the analog supply and DVDD is the digital supply.  All input signals and supplies should be referenced to a common point and this is the GND pin of the ADS1244.  Both of the common (AGND and DGND) for AVDD and DVDD should connect to the GND pin.  This connection should be as short and as low inductance as possible.  A long wire can pick up EMI/RFI noise and effect the result.

    Best regards,

    Bob B