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WM8510GEDS/RV 데이터시트(PDF) 26 Page - Wolfson Microelectronics plc

부품명 WM8510GEDS/RV
상세설명  Mono CODEC with Speaker Driver
PDF  81 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8510GEDS/RV 데이터시트(HTML) 26 Page - Wolfson Microelectronics plc

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WM8510
Production Data
w
PD Rev 4.1 December 2006
26
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.
Figure 12 ALC Limiter Mode Operation
ATTACK AND DECAY TIMES
The attack and decay times set the update times for the PGA gain. The attack time is the time
constant used when the gain is reducing. The decay time is the time constant used when the gain is
increasing. In limiter mode, the time constants are faster than in ALC mode. The time constants are
shown below in terms of a single gain step, a change of 6dB and a change of 90% of the PGAs gain
range.
Note that, these times will vary slightly depending on the sample rate used (specified by the SR
register).



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