WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 43

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
w
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
(13ms/6dB)
0011
(2.9ms/6dB)
0010
(832us/6dB)
0010
(182us/6dB)
DEFAULT
0000 = -22.5dBFS
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
Per
step
410us
820us
1.64ms
420ms
Per
step
90.8us
181.6us
363.2us
93ms
Per
step
104us
208us
416us
106ms
Per
step
22.7us
DESCRIPTION
PP, Rev 3.5, January 2007
Per
6dB
3.3ms
6.6ms
13.1ms
3.36s
Per
6dB
726.4us
1.453ms
2.905ms
744ms
Per
6dB
832us
1.66ms
3.32ms
852ms
Per
6dB
182.4us
WM8985
90% of
range
24ms
48ms
192ms
24.576s
90% of
range
10.53
ms
21.06
ms
90% of
range
6ms
12ms
90% of
range
5.26ms
5.39s
24.1ms
6.18s
1.31ms
43