WM8991 datasheet(172/174 Pages) WOLFSON

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WM8991 Datasheet(PDF) 172 Page - Wolfson Microelectronics plc

Part #	WM8991

Description	Mobile Multimedia CODEC with Dual-Mode Class AB/D Speaker Driver

PDF	174 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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172 / 174 page

WM8991

Pre-Production

PP, May 2008, Rev 3.1

172

The distance between the WM8991 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 WM8991 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.

Figure 106 EMI Reduction Techniques

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