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WM8940CGEFL/V Datasheet(PDF) 32 Page - Cirrus Logic |
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WM8940CGEFL/V Datasheet(HTML) 32 Page - Cirrus Logic |
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32 / 88 page  WM8940 32 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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