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WM8940CGEFL/V Folha de dados(PDF) 32 Page - Cirrus Logic

Nome de Peças WM8940CGEFL/V
Descrição Electrónicos  Mono CODEC with Speaker Driver
PDF  88 Pages
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Fabricante Electrônico  CIRRUS [Cirrus Logic]
Página de início  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8940CGEFL/V Folha de dados(HTML) 32 Page - Cirrus Logic

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WM8940
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Rev 4.4
NORMAL MODE
In normal mode, the ALC will attempt to maintain a constant signal level by increasing or decreasing
the gain of the PGA. The following diagram shows an example of this.
Input
Signal
ALCSEL
PGA
Gain
ALCLVL
t
ATK
t
DCY
Output
of PGA
V
step
Figure 12 ALC Normal Mode Operation
LIMITER MODE
In limiter mode, the ALC will reduce peaks that go above the threshold level, but will not increase the
PGA gain beyond the starting level.
The starting level is the PGA gain setting when the ALC is
enabled in limiter mode. If the ALC is started in limiter mode, this is the gain setting of the PGA at
start-up. If the ALC is switched into limiter mode after running in ALC mode, the starting gain will be
the gain at switchover. The diagram below shows an example of limiter mode.



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