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WM8940CGEFL/V bảng dữ liệu(PDF) 30 Page - Wolfson Microelectronics plc

tên linh kiện WM8940CGEFL/V
Giải thích chi tiết về linh kiện  Mono CODEC with Speaker Driver
PDF  91 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
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WM8940CGEFL/V bảng dữ liệu(HTML) 30 Page - Wolfson Microelectronics plc

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WM8940
Production Data
w
PD, Rev 4.3, November 2011
30
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
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
3.38ms
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
… (time doubles with every step)
1010 or
higher
23.2ms
186ms
1.34s
R42 (2Ah)
ALC Control 4
1
ALCZC
0 (zero cross
off)
ALC uses zero cross detection circuit.
0 = Disabled (recommended)
1 = Enabled
Table 20 ALC Control Registers
NOTE: The Input PGA Volume register R45 must be written with the INPPGAMUTE bit R45[6] set to
0 before setting ALCSEL bit R32[8] to 1.
When the ALC is disabled, the input PGA remains at the last controlled value of the ALC. An input
gain update must be made by writing to the INPPGAVOLL/R register bits.



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