WM8940GEFL/V Wolfson Microelectronics, WM8940GEFL/V Datasheet - Page 35

• Manufacturer Part Number: WM8940GEFL/V
• Description: Audio CODECs Mono CODEC with Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8940GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Production Data
Table 25 ALC Min Gain Values
ALC HOLD TIME (NORMAL MODE ONLY)
Table 26 ALC Hold Time
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.
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.
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.
threshold during the hold period, the hold phase is abandoned and the ALC returns to normal
operation.
ALCMIN
000
001
010
011
100
101
110
111
R33
ALC Control 2
REGISTER
ADDRESS
7:4
Minimum Gain (dB)
BIT
ALCHLD
-12
12
18
24
30
-6
0
6
LABEL
0000
DEFAULT
ALC hold time before gain is increased.
DESCRIPTION
If the signal goes above the
PD, Rev 4.2, April 2008
WM8940
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