WM8974GEFL/V Wolfson Microelectronics, WM8974GEFL/V Datasheet - Page 24

Audio CODECs Mono Codec with Spkr

WM8974GEFL/V

Manufacturer Part Number
WM8974GEFL/V
Description
Audio CODECs Mono Codec with Spkr
Manufacturer
Wolfson Microelectronics
Datasheet

Specifications of WM8974GEFL/V

Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QFN-24
Minimum Operating Temperature
- 25 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
WM8974
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Table 14 ALC Control Registers
R34 (22h)
ALC Control 3
REGISTER
ADDRESS
8
7:4
8
7:4
3:0
BIT
ALCZC
ALCHLD
[3:0]
ALCMODE
ALCDCY
[3:0]
ALCATK
[3:0]
LABEL
0 (zero cross
off)
0000
(0ms)
0
0011
(26ms/6dB)
0011
(5.8ms/6dB)
0010
(3.3ms/6dB)
0010
(726us/6dB)
DEFAULT
ALC uses zero cross detection circuit.
0 = Disabled (recommended)
1 = Enabled
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
0001
0010
… (time doubles with every step)
1010 or
higher
Per step
410us
820us
1.64ms
420ms
Per step
90.8us
182us
363us
93ms
Per step
104us
208us
416us
106ms
Per step
22.7us
45.4us
90.8us
23.2ms
PD, Rev 4.5, September 2008
DESCRIPTION
Per 6dB
3.38ms
6.56ms
13.1ms
3.36s
Per 6dB
726us
1.45ms
2.91ms
744ms
Per 6dB
832us
1.66ms
3.33ms
852ms
Per 6dB
182.4us
363us
726us
186ms
Production Data
23.6ms
47.2ms
94.5ms
24.2s
10.5ms
20.9ms
6ms
12ms
24ms
90% of range
90% of range
5.23ms
5.36s
90% of range
6.13s
90% of range
1.31ms
2.62ms
5.23ms
1.34s
24

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