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WM8978CGEFL/V Datasheet(PDF) 37 Page - Wolfson Microelectronics plc

No. de pieza WM8978CGEFL/V
Descripción Electrónicos  Stereo CODEC with Speaker Driver
PDF  118 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978CGEFL/V Datasheet(HTML) 37 Page - Wolfson Microelectronics plc

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Production Data
WM8978
w
PD, Rev 4.5, October 2011
37
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:4
ALCHLD
[3:0]
0000
(0ms)
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
R34 (22h)
ALC Control
3
8
ALCMODE
0
Determines the ALC mode of
operation:
0 = ALC mode (Normal Operation)
1 = Limiter mode.
7:4
ALCDCY
[3:0]
0011
(26ms/6dB)
Decay (gain ramp-up) time
(ALCMODE ==0)
Per
step
Per
6dB
90% of
range
0000
410us
3.28ms
23.6ms
0001
820us
6.56ms
47.2ms
0010
1.64ms
13.1ms
94.5ms
… (time doubles with every step)
1010
or
higher
420ms
3.36s
24.2s
0011
(5.8ms/6dB)
Decay (gain ramp-up) time
(ALCMODE ==1)
Per
step
Per
6dB
90% of
range
0000
90.8us
726us
5.23ms
0001
182us
1.45ms
10.5ms
0010
363us
2.91ms
20.9ms
… (time doubles with every step)
1010
93ms
744ms
5.36s
3:0
ALCATK
[3:0]
0010
(3.3ms/6dB)
ALC attack (gain ramp-down) time
(ALCMODE == 0)
Per
step
Per
6dB
90% of
range
0000
104us
832us
6ms
0001
208us
1.66ms
12ms
0010
416us
3.33ms
24ms
… (time doubles with every step)
1010
or
higher
106ms
852ms
6.13s
0010
(726us/6dB)
ALC attack (gain ramp-down) time
(ALCMODE == 1)
Per
step
Per
6dB
90% of
range
0000
22.7us
182.4us
1.31ms
0001
45.4us
363us
2.62ms
0010
90.8us
726us
5.23ms



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