Pre-Production
WM8985
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
00
DESCRIPTION
Reserved. Initialise to 0
REFER TO
25 (19h)
8:7
6:4
LIMLVL
000
Output Signal
Path
Programmable signal threshold level
(determines level at which the DAC limiter starts
to operate)
000=-1dB
001=-2dB
010=-3dB
011=-4dB
100=-5dB
101 to 111=-6dB
3:0
LIMBOOST
0000
Output Signal
Path
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
27 (1Bh)
8
NFU
0
Notch filter update. The notch filter values used
internally only update when one of the NFU bits
is set high.
Analogue to
Digital
Converter
(ADC)
7
NFEN
NFA0[13:7]
NFU
0
Analogue to
Digital
Converter
(ADC)
Notch filter enable:
0=Disabled
1=Enabled
6:0
8
0000000
0
Notch Filter a0 coefficient, bits [13:7]
Analogue to
Digital
Converter
(ADC)
28 (1Ch)
29 (1Dh)
30 (1Eh)
Notch filter update. The notch filter values used
internally only update when one of the NFU bits
is set high.
Analogue to
Digital
Converter
(ADC)
7
0
Reserved. Initialise to 0
6:0
NFA0[6:0]
NFU
0000000
Notch Filter a0 coefficient, bits [6:0]
Analogue to
Digital
Converter
(ADC)
8
0
Notch filter update. The notch filter values used
internally only update when one of the NFU bits
is set high.
Analogue to
Digital
Converter
(ADC)
7
0
Reserved. Initialise to 0
6:0
NFA1[13:7]
NFU
0000000
Notch Filter a1 coefficient, bits [13:7]
Analogue to
Digital
Converter
(ADC)
8
0
Notch filter update. The notch filter values used
internally only update when one of the NFU bits
is set high.
Analogue to
Digital
Converter
(ADC)
7
0
Reserved. Initialise to 0
6:0
NFA1[6:0]
0000000
Notch Filter a1 coefficient, bits [6:0]
Analogue to
Digital
Converter
(ADC)
PP, Rev 3.4, October 2006
99
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
