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DataSheet4U.
com AN165 Application Note CS4297A/CS4299 EMI REDUCTION TECHNIQUES 1.
INTRODUCTION The CS4297A and CS4299 AC ’97 audio codecs are based on a new and faster fabrication process, and certain precautions in the analog I/O circuitry may be required to prevent 49.
1 MHz commonmode radiation.
Note that 49.
1 MHz is 2 times the CS4297A internal clock frequency of 24.
576 MHz.
3.
EMI SHUNTING CIRCUIT The key to reducing common-mode emissions is to add decoupling (called shunting) at the audio I/O connectors.
The shunt capacitors must be connected to a "clean" (free of digital noise) I/O ground.
The recommended EMI shunting circuit is shown in the following diagram, and includes ferri...

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