WM8904ECSSLASHR datasheet(80/188 Pages) WOLFSON

Teilenummer	WM8904ECS/R

Bauteilbeschribung	Ultra Low Power CODEC for Portable Audio Applications

PDF	188 Pages

Scroll/Zoom	100%

Hersteller	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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80 / 188 page

WM8904

Pre-Production

PP, Rev 3.3, September 2012

EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS

It is recommended to connect a zobel network to the ground-referenced outputs HPOUTL, HPOUTR,

LINEOUTL and LINEOUTR in order to ensure best audio performance in all applications. The

components of the zobel network have the effect of dampening high frequency oscillations or

instabilities that can arise outside the audio band under certain conditions. Possible sources of these

instabilities include the inductive load of a headphone coil or an active load in the form of an external

line amplifier. The capacitance of lengthy cables or PCB tracks can also lead to amplifier instability.

The zobel network should comprise a 20

 resistor and 100nF capacitor in series with each other, as

illustrated in Figure 38.

Note that the zobel network is recommended for best audio quality and amplifier stability in all cases.

Figure 38 Zobel Network Components for HPOUTL, HPOUTR, LINEOUTL and LINEOUTR

WM8904ECS/R Datenblatt(PDF) 80 Page - Wolfson Microelectronics plc