ADUM5242 EMI

Hi
I have a question ADUM5242.

Ask about ADUM 5242ARZ-RL7.
Connect between the output pin (pin 8: Viso) - output GND (pin 5: GNDiso)
Although it is a capacitor, 0.1uF is connected in the recommended layout on page 13 in the specification sheet.
As a result of measuring EMI, when we set this capacitance value to 0.01 uF good result is obtained and we want to change capacitance value.
As the output load, 3 kohm is 10 kohm in parallel between the output power supply and output GND at maximum.

1. Is there a lower limit capacitance as output capacitor?
Is there any concerns such as defects when 2.0.01 uF is used?
3. By changing the output capacitor with the attached characteristics from 0.22 uF to 0.01 uF
EMI noise reduction is seen. Is there anything you can guess about this factor?
Best Regards
HOD
Parents
  • HOD:

    This is a good question. The ADuM524x datasheet was the first isoPower and data channel part, and I we have learned more about the use of ferrites on the output power and ground pins.  I would recommend you read the app note AN-1349 for the latest on ferrite resistance vs frequency, layout and location to reduce emissions.

    Regards, Brian

Reply
  • HOD:

    This is a good question. The ADuM524x datasheet was the first isoPower and data channel part, and I we have learned more about the use of ferrites on the output power and ground pins.  I would recommend you read the app note AN-1349 for the latest on ferrite resistance vs frequency, layout and location to reduce emissions.

    Regards, Brian

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