Pre-Production
WM8940
REGISTER
ADDRESS
BIT
LABEL
DACMU
DEFAULT
DESCRIPTION
DAC soft mute enable
REFER TO
6
0
Output Signal
Path
0 = DACMU disabled
1 = DACMU enabled
Reserved
5:3
2
00
0
AMUTE
DAC auto mute enable
0 = auto mute disabled
1 = auto mute enabled
Reserved
Output Signal
Path
1
0
0
0
DACPOL
DACVOL
DAC Polarity Invert
0 = No inversion
Output Signal
Path
1 = DAC output inverted
Reserved
11 (0Bh)
15:8
7:0
00h
11111111
DAC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
Reserved
Output Signal
Path
12 (0Ch)
13 (0Dh)
14 (0Eh)
15:0
15:0
15:9
8
Reserved
00h
1
Reserved
HPFEN
Analogue to
Digital Converter
(ADC)
High Pass Filter Enable
0=disabled
1=enabled
7
HPFAPP
HPFCUT
0
Select audio mode or application mode
0=Audio mode (1st order, fc = ~3.7Hz)
1=Application mode (2nd order, fc = HPFCUT)
Application mode cut-off frequency
See Table 14 for details.
Analogue to
Digital Converter
(ADC)
6:4
000
Analogue to
Digital Converter
(ADC)
3:1
0
00
0
Reserved
ADCPOL
ADCVOL
ADC Polarity
Analogue to
Digital Converter
(ADC)
0=normal
1=inverted
15 (0Fh)
15:8
7:0
00h
Reserved
11111111
ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
Analogue to
Digital Converter
(ADC)
16 (10h)
15
14
NF0_UP
NF0_EN
0
0
Notch filter 0 update. The notch filter 0 values used
internally only update when one of the NF0_UP bits is Digital Converter
set high.
Analogue to
(ADC)
Analogue to
Digital Converter
(ADC)
Notch filter 0 enable:
0=Disabled
1=Enabled
13:0
15
NF0_A0
NF0_UP
0000h
Notch Filter 0 a0 coefficient
Analogue to
Digital Converter
(ADC)
17 (11h)
0
0
Notch filter 0 update. The notch filter 0 values used
internally only update when one of the NF0_UP bits is Digital Converter
set high.
Analogue to
(ADC)
14
Reserved
Pre-Production, Rev 3.0, February 2007
71
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
