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ADS1299-4: Power supply question

Sara Jia
Expert 2975 points
Part Number: ADS1299-4
Other Parts Discussed in Thread: ADS1299

Dears,

    I am doubt on  power supply of ads1299 in datasheet,As the datasheet told, the AVDD is referenced to the device analog return(AVSS),but why is connected  to DGND? and I find in the evm PCB,AVDD is connected  with AVSS by a cap.

  • 0
    TI__Guru 66406 points

    Hello,

    In both power supply configurations, all power supply pins are decoupled to the same system ground. This is actually where the return current will flow back to the system power supply source. I'm not sure why that specific wording was used in the description. I believe it should not make a difference if you decouple the supply pins to GND or AVSS since both are DC. To AC signals, both GND and AVSS will be seen as "ground."


    Best Regards,