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WM8959 Datasheet(PDF) 152 Page - Wolfson Microelectronics plc |
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WM8959 Datasheet(HTML) 152 Page - Wolfson Microelectronics plc |
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152 / 155 page  WM8959 Pre-Production w PP, May 2008, Rev 3.1 152 The distance between the WM8959 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 99. When additional passive filtering is used, low ESR components should be chosen to minimise series resistance between the WM8959 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. WM8959 SPKP SPKN EMI WM8959 SPKP SPKN Short connection reduces EMI WM8959 SPKP SPKN LC Filtering reduces EMI LOW ESR LOW ESR WM8959 SPKP SPKN Shielding using PCB ground plane (or Vdd) reduces EMI WM8959 SPKP SPKN Ferrite beads reduce EMI LC filtering is more effective at removing EMI at frequencies below ~30MHz Ferrite beads are more effective at removing EMI at frequencies above ~30MHz Long, exposed tracks emit more EMI Figure 99 EMI Reduction Techniques |
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