WM8974GEFL/V Wolfson Microelectronics, WM8974GEFL/V Datasheet - Page 73

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

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

Production Data
w
33 (21h)
34 (22h)
35 (23h)
REGISTER
ADDRESS
8
7:4
3:0
8
7:4
3:0
8:4
3
BIT
ALCZC
ALCHLD
ALCLVL
ALCMODE
ALCDCY
ALCATK
NGEN
LABEL
0
000
1011
0
0
0011
0011
0010
0010
00000
DEFAULT
ALC zero cross detection.
0 = disabled
1 = enabled
ALC hold time before gain is increased.
0000 = 0ms
0001 = 2.67ms
0010 = 5.33ms
… (time doubles with every step)
1111 = 43.691s
ALC target – sets signal level at ADC input
0000 = -28.5dB FS
0001 = -27.0dB FS
… (1.5dB steps)
1110 = -7.5dB FS
1111 = -6dB FS
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)
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
Reserved
ALC Noise gate function enable
1 = enable
0 = disable
Per step
410us
820us
1.64ms
420ms
Per step
90.8us
181.6us
363.2us
93ms
Per step
104us
208us
416us
106ms
Per step
22.7us
45.4us
90.8us
23.2ms
DESCRIPTION
Per 6dB
3.3ms
6.6ms
13.1ms
3.36s
Per 6dB
726.4us
1.453ms
2.905ms
744ms
Per 6dB
832us
1.664ms
3.328ms
852ms
Per 6dB
182.4us
363.2us
726.4us
186ms
90% of range
24ms
48ms
192ms
24.576s
90% of range
5.26ms
10.53ms
21.06ms
5.39s
90% of range
6ms
12ms
24.1ms
6.18s
90% of range
1.31ms
2.62ms
5.26ms
1.348s
PD, Rev 4.5, 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
WM8974
73