wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 92

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

WM8982
w
32 (20h)
33 (21h)f
34 (22h)
REGISTER
ADDRESS
8
7:6
5:3
2:0
8
7:4
3:0
8
7:4
BIT
ALCSEL
ALCMAXGAIN
ALCMINGAIN
ALCHLD
ALCLVL
ALCMODE
ALCDCY
[3:0]
LABEL
00
111
000
0000
1011
0
0
0
0011
0011
DEFAULT
ALC function select:
0=ALC off
1=ALC on
Reserved
Set Maximum Gain of PGA
111=+35.25dB
110=+29.25dB
101=+23.25dB
100=+17.25dB
011=+11.25dB
010=+5.25dB
001=-0.75dB
000=-6.75dB
Set minimum gain of PGA
000=-12dB
001=-6dB
010=0dB
011=+6dB
100=+12dB
101=+18dB
110=+24dB
111=+30dB
Reserved
ALC hold time before gain is increased.
0000 = 0ms
0001 = 2.67ms
0010 = 5.33ms
… (time doubles with every step)
1010 or higher = 1.36s
ALC target – sets signal level at ADC input
1111 : -1.5dBFS
1110 : -1.5dBFS
1101 : -3dBFS
1100 : -4.5dBFS
...... (-1.5dB steps)
0001 : -21dBFS
0000 : -22.5dBFS
Determines the ALC mode of operation:
0=ALC mode
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)
Per step
410us
820us
1.64ms
420ms
Per step
DESCRIPTION
Per 6dB
3.28ms
6.56ms
13.1ms
3.36s
Per 6dB
90% of
range
23.6ms
47.2ms
94.5ms
24.2s
90% of
range
PP, Rev 3.2, September 2008
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
REFER TO
Pre-Production
92