Datasheet Details
| Part number | AN165 |
|---|---|
| Manufacturer | Crystal |
| File Size | 58.51 KB |
| Description | EMI REDUCTION TECHNIQUES |
| Download | AN165 Download (PDF) |
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| Part number | AN165 |
|---|---|
| Manufacturer | Crystal |
| File Size | 58.51 KB |
| Description | EMI REDUCTION TECHNIQUES |
| Download | AN165 Download (PDF) |
|
|
|
Common-mode radiation is the result of undesired voltage drops due to voltage differentials in the I/O ground system.
The CS4297A clock transitions result in a rush of current that may induce the digital ground plane to "bounce".
When external speaker or microphone cables are connected to the audio system, any common-mode voltage potential on the analog ground will drive the cables (antennas) and radiate electric fields.
www.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.
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