Limiter Mode - Cirrus Logic WM8940 Manual

34
ALCMODE = 0 (Normal Mode)
t
ALCDCY
DCY
0000 410µs
0001 820µs
0010 1.64ms
0011 3.28ms
0100 6.56ms
0101 13.1ms
0110 26.2ms
0111 52.5ms
1000 105ms
1001 210ms
1010 420ms
Table 21 ALC Normal Mode (Attack and Decay times)

LIMITER MODE

ALCMODE = 1 (Limiter Mode)
t
ALCATK
ATKLIM
0000 22.7µs
0001 45.4µS
0010 90.8µS
0011 182µS
0100 363µS
0101 726µS
0110 1.45ms
0111 2.9ms
1000 5.81ms
1001 11.6ms
1010 23.2ms
ALCMODE = 1 (Limiter Mode)
t
ALCDCY
DCYLIM
0000 90.8µs
0001 182µS
0010 363µS
0011 726µS
0100 1.45ms
0101 2.91ms
0110 5.81ms
0111 11.6ms
1000 23.2ms
1001 46.5ms
1010 93ms
Table 22 ALC Limiter Mode (Attack and Decay times)
Decay Time (s)
t t
DCY6dB DCY90%
3.28ms 23.6ms
6.56ms 47.2ms
13.1ms 94.5ms
26.2ms 189ms
52.5ms 378ms
105ms 756ms
210ms 1.51s
420ms 3.02s
840ms 6.05s
1.68s 12.1s
3.36s 24.2s
Attack Time (s)
t t
ATKLIM6dB ATKLIM90%
182µs 1.31ms
363µs 2.62ms
726µs 5.23ms
1.45ms 10.5ms
2.91ms 20.9ms
5.81ms 41.8ms
11.6ms 83.7ms
23.2ms 167ms
46.5ms 335ms
93ms 669ms
186ms 1.34s
Attack Time (s)
t t
DCYLIM6dB DCYLIM90%
726µs 5.23ms
1.45ms 10.5ms
2.91ms 20.9ms
5.81ms 41.8ms
11.6ms 83.7ms
23.2ms 167ms
46.5ms 335ms
93ms 669ms
186ms 1.34s
372ms 2.68s
744ms 5.36s
WM8940
Rev 4.4