wm8974gefl-v Wolfson Microelectronics plc, wm8974gefl-v Datasheet - Page 72

• Manufacturer Part Number: wm8974gefl-v
• Description: Mono Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

WM8974
w
27 (1Bh)
28 (1Ch)
29 (1Dh)
30 (1Eh)
32 (20h)
REGISTER
ADDRESS
3:0
8
7
6:0
8
7
6:0
8
7
6:0
8
7
6:0
8
7:6
5:3
2:0
BIT
LIMBOOST
NFU
NFEN
NFA0[13:7]
NFU
NFA0[6:0]
NFU
NFA1[13:7]
NFU
NFA1[6:0]
ALCSEL
ALCMAX
ALCMIN
LABEL
0
0000000
0
0000000
0
0000000
0
0000000
0
000
0000
0
0
0
0
111
DEFAULT
DAC Limiter volume boost (can be used as a stand
alone volume boost when LIMEN=0):
0000=0dB
0001=+1dB
0010=+2dB
… (1dB steps)
1011=+11dB
1100=+12dB
1101 to 1111=reserved
Notch filter update. The notch filter values used internally only
update when one of the NFU bits is set high.
Notch filter enable:
0=Disabled
1=Enabled
Notch Filter a0 coefficient, bits [13:7]
Notch filter update. The notch filter values used internally only
update when one of the NFU bits is set high.
Reserved
Notch Filter a0 coefficient, bits [6:0]
Notch filter update. The notch filter values used internally only
update when one of the NFU bits is set high.
Reserved
Notch Filter a1 coefficient, bits [13:7]
Notch filter update. The notch filter values used internally only
update when one of the NFU bits is set high.
Reserved
Notch Filter a1 coefficient, bits [6:0]
ALC function select:
0=ALC off (PGA gain set by INPPGAVOL register bits)
1=ALC on (ALC controls PGA gain)
Reserved
Set Maximum Gain of PGA when using ALC:
111=+35.25dB
110=+29.25dB
101=+23.25dB
100=+17.25dB
011=+11.25dB
010=+5.25dB
001=-0.75dB
000=-6.75dB
Set minimum gain of PGA when using ALC:
000=-12dB
001=-6dB
010=0dB
011=+6dB
100=+12dB
101=+18dB
110=+24dB
111=+30dB
DESCRIPTION
PD, Rev 4.5, September 2008
Output Signal Path
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Analogue to Digital
Converter (ADC)
Input Limiter /
Automatic Level
Control (ALC)
Input Limiter /
Automatic Level
Control (ALC)
Input Limiter /
Automatic Level
Control (ALC)
Production Data
REFER TO
72