wm8940gefl-v Wolfson Microelectronics plc, wm8940gefl-v Datasheet - Page 29

• Manufacturer Part Number: wm8940gefl-v
• Description: Mono Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

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Production Data
R34 (22h)
ALC Control 3
REGISTER
ADDRESS
7:4
8
7:4
3:0
BIT
ALCHLD
[3:0]
ALCMODE
ALCDCY
[3:0]
ALCATK
[3:0]
LABEL
0000
(0ms)
0
0011
(26ms/6dB)
0011
(5.8ms/6dB)
0010
(3.3ms/6dB)
0010
(726us/6dB)
DEFAULT
ALC hold time before gain is increased.
0000 = 0ms
0001 = 2.67ms
0010 = 5.33ms
0011 = 10.66ms
0100 = 21.32ms
0101 = 42.64ms
0110 = 85.28ms
0111 = 0.17s
1000 = 0.34s
1001 = 0.68s
1010 or higher = 1.36s
Determines the ALC mode of operation:
0 = ALC mode (Normal Operation)
1 = Limiter mode.
Decay (gain ramp-up) time
(ALCMODE ==0)
0000
0001
0010
… (time doubles with every step)
1010
or
higher
Decay (gain ramp-up) time
(ALCMODE ==1)
0000
0001
0010
… (time doubles with every step)
1010
ALC attack (gain ramp-down) time
(ALCMODE == 0)
0000
0001
0010
… (time doubles with every step)
1010 or
higher
ALC attack (gain ramp-down) time
(ALCMODE == 1)
0000
0001
0010
… (time doubles with every step)
Per step
410us
820us
1.64ms
420ms
Per step
90.8us
182us
363us
93ms
Per step
104us
208us
416us
106ms
Per step
22.7us
45.4us
90.8us
DESCRIPTION
PD, Rev 4.2, April 2008
Per 6dB
3.38ms
6.56ms
13.1ms
3.36s
Per 6dB
726us
1.45ms
2.91ms
744ms
Per 6dB
832us
1.66ms
3.33ms
852ms
Per 6dB
182.4us
363us
726us
WM8940
range
23.6ms
47.2ms
94.5ms
24.2s
range
5.23ms
10.5ms
20.9ms
5.36s
range
6ms
12ms
24ms
range
1.31ms
2.62ms
5.23ms
90% of
90% of
90% of
6.13s
90% of
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