WM8904 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8904

Ultra Low Power CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8904

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3. Zobel Networks

The Zobel network shown in Figure 71 is required on HPOUTL, HPOUTR, LINEOUTL and LINEOUTR whenever that output is

enabled. Stability of these ground-referenced outputs across all process corners cannot be guaranteed without the Zobel

network components. (Note that, if any ground-referenced output pin is not required, the zobel network components can be

omitted from the output pin, and the pin can be left floating.) The Zobel network requirement is detailed further in the

applications note WAN_0212 “Class W Headphone Impedance Compensation”.

Zobel networks (C6, C7, C8, C9, R1, R2, R3, R4) should be positioned reasonably close to the WM8904.

4. Microphone Grounding

R7 and R8 can be populated with other values to remove common mode noise on the microphone if required.

w

PP, Rev 3.3, September 2012

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