WM8985_07 Datasheet, PDF (116/118 Pages) Wolfson Microelectronics plc – Multimedia CODEC With Class D Headphone and Line Out

WM8985
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
Pre-Production
Figure 64 External Component Diagram
1. When operating LOUT2 and ROUT2 in class D mode, it is recommended that LC filtering is placed as close to
the LOUT2 and ROUT2 pins as possible. Low ESR components should be used for maximum efficiency. It is
recommended that a filter, consisting of a 33µH inductor and a 220nF capacitor, is used for optimal performance.
2. The addition of ferrite beads to the outputs of LOUT2 and ROUT2 will suppress any potential interference noise
produced by the class D switching clocks.
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PP, Rev 3.5, March 2007
116