WM8990ECS/RV Wolfson Microelectronics, WM8990ECS/RV Datasheet - Page 170
WM8990ECS/RV
Manufacturer Part Number
WM8990ECS/RV
Description
Audio CODECs Stereo CODEC w.Class AB/D speaker driver
Manufacturer
Wolfson Microelectronics
Datasheet
1.WM8990ECSRV.pdf
(172 pages)
Specifications of WM8990ECS/RV
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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WM8990
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Figure 106 EMI Reduction Techniques
The distance between the WM8990 and the speakers should be kept to a minimum to reduce series
resistance, and also to reduce EMI. Further reductions in EMI can be achieved by additional passive
filtering and/or shielding as shown in Figure 106. When additional passive filtering is used, low ESR
components should be chosen to minimise series resistance between the WM8990 and the speaker,
maximising efficiency.
LC passive filtering will usually be effective at reducing EMI at frequencies up to around 30MHz. To
reduce emissions at higher frequencies, ferrite beads placed as close to the device as possible will
be more effective.
PD, March 2009, Rev 4.0
Production Data
170
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