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WM8912 数据表(PDF) 45 Page - Cirrus Logic |
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WM8912 数据表(HTML) 45 Page - Cirrus Logic |
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45 / 129 page  Production Data WM8912 w PD, Rev 4.1, February 2013 45 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 of a 20 resistor and 100nF capacitor in series with each other, as illustrated in Figure 23. Note that the zobel network is recommended for best audio quality and amplifier stability in all cases. Figure 23 Zobel Network Components for HPOUTL, HPOUTR, LINEOUTL and LINEOUTR |
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