WM8959 datasheet(152/155 Pages) WOLFSON

tên linh kiện	WM8959

Giải thích chi tiết về linh kiện	Mobile Multimedia DAC with Dual-Mode Class AB/D Speaker Driver

PDF	155 Pages

Scroll/Zoom	100%

nhà sản xuất	WOLFSON [Wolfson Microelectronics plc]

Trang chủ	http://www.wolfsonmicro.com

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152 / 155 page

WM8959

Pre-Production

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

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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