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WM8978CGEFL/V Datasheet(PDF) 43 Page - Wolfson Microelectronics plc

Part # WM8978CGEFL/V
Description  Stereo CODEC with Speaker Driver
PDF  118 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978CGEFL/V Datasheet(HTML) 43 Page - Wolfson Microelectronics plc

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Production Data
WM8978
w
PD, Rev 4.5, October 2011
43
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
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R33
ALC Control
2
7:4
ALCHLD
0000
ALC hold time before gain is increased.
Table 23 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.
Figure 20 ALCLVL



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