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Questions about the AFE4490 ADC

Michael Liesenberg
Prodigy 60 points
Other Parts Discussed in Thread: AFE4490

We want to implement the AFE4490 in our medical device. We bought the  evaluation board AFE44x0SPO2EVM and I have some questions about the ADC:

  1. When does the ADC average? Does it make it more at the beginning or rather at the end of an ADC conversion?
  2. Does the ADC average itself or does the microcontroller average the measurement value?
  3. In the AFE44x0SPO2EVM GUI (associated software ) I can read the result values ​​in Excel files ( in the program under "Save" ) . In these excel-files "Device_Codes_ ...",  what does these values ​​mean? Does it mean that these values are from the ADC to the microcontroller for processing? Can someone help me to interpret these values?

best regards

p.p.
ELCAT GmbH

  • 0
    TI__Mastermind 18285 points

    Michael,

    1. The ADC Averages as soon as it recieves samples, which is at the end of a conversion.

    2. The ADC averages itself. The uC does not average the measurement value.

    3. Yes, the device codes are the ADC codes.

    Additional Notes:

    ADC averaging mode has a range of 1-255 averages. The ADC averaging enables further reduction in the ADC noise and enables an extremely high dynamic range for use cases where high SNR is needed.