WM8983
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BIASEN
The analogue amplifiers will not operate unless BIASEN is enabled.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
3
BIASEN
0
Analogue amplifier bias control
0 = disabled
Power
management 1
1 = enabled
Table 60 Analogue Bias Control
BIAS CONTROL
Control of the analog bias values is possible using register 61 and 62
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R61
Bias control
8
BIASCUT
0
Global bias control
0 = normal
1 = 0.5x
6
HALF_
IPGA
0
Input bias control
0 = normal
1 = 0.5x
4,3
BUFBIAS 01
ADC input buffer bias
00 = 1.5x
01 = 1.0x
10 = 1.0x
11 = 0.5x
2,1
ADCBIAS 01
ADC input buffer bias
00 = 1.5x
01 = 1.0x
10 = 1.0x
11 = 0.5x
0
3
HALFOP
BIAS
0
0
Output bias
0 = normal
1 = 0.5x
R62
HALF
DACI
DAC bias
0 = normal
1 = 0.5x
Table 61 Analogue Bias Control
Note that these bits must be used with care and may cause degradation in analog performance. For
example, if both BIASCUT and HALFDACI are used at same time, the playback THD will be poor.
PP Rev 1.1 August 2005
76
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
