WM8510_06 Datasheet, PDF (30/81 Pages) Wolfson Microelectronics plc – Mono CODEC with Speaker Driver

WM8510
ALCMIN
000
001
010
011
100
101
110
111
Minimum Gain (dB)
-12
-6
0
6
12
18
24
30
Production Data
Table 19 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
its decay phase (gain increasing). The hold time is set by the ALCHLD register.
REGISTER BIT
ADDRESS
LABEL
R33
7:4 ALCHLD
ALC Control
2
Table 20 ALC Hold Time
DEFAULT
DESCRIPTION
0000
ALC hold time before gain is increased.
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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PD Rev 4.1 December 2006
30