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WM8985GEFL/R 데이터시트(PDF) 49 Page - Wolfson Microelectronics plc

부품명 WM8985GEFL/R
상세설명  Multimedia CODEC With Class D Headphone and Line Out
PDF  118 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R 데이터시트(HTML) 49 Page - Wolfson Microelectronics plc

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Pre-Production
WM8985
w
PP, Rev 3.5, January 2007
49
ALCMIN
Minimum Gain (dB)
000
-12
001
-6
010
0
011
6
100
12
101
18
110
24
111
30
Table 25 ALC Min Gain Values
Note that if the ALC gain setting strays outside the ALC operating range, either by starting the ALC
outside of the range or changing the ALCMAX or ALCMIN settings during operation, the ALC will
immediately adjust the gain to return to the ALC operating range. It is recommended that the ALC
starting gain is set between the ALCMAX and ALCMIN limits.
ALC HOLD TIME (NORMAL MODE ONLY)
In Normal mode, the ALC has an adjustable hold time which sets a time delay before the ALC
begins it’s decay phase (gain increasing). The hold time is set by the ALCHLD register.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R33
ALC Control
2
7:4
ALCHLD
0000
ALC hold time before gain is increased.
Table 26 ALC Hold Time
If the hold time is exceeded this indicates that the signal has reached a new average level and the
ALC will increase the gain to adjust for that new average level. If the signal goes above the
threshold during the hold period, the hold phase is abandoned and the ALC returns to normal
operation.



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