WM8904 Datasheet, PDF (63/188 Pages) Wolfson Microelectronics plc – Ultra Low Power CODEC for Portable Audio Applications

Pre-Production
WM8904
The polarity of each ADC output signal can be changed under software control using the
ADCL_DATINV and ADCR_DATINV register bits. The AIFADCL_SRC and AIFADCR_SRC register
bits may be used to select which ADC is used for the left and right digital audio interface data. These
register bits are described in Table 27.
REGISTER BIT
ADDRESS
LABEL
R24 (18h)
7
AIFADCL_SRC
Audio
Interface 0
6 AIFADCR_SRC
R38 (26h)
1
ADCL_DATINV
ADC Digital
0
0 ADCR_DATINV
Table 27 ADC Routing and Control
DEFAULT
DESCRIPTION
0
Left Digital Audio interface source
0 = Left ADC data is output on left
channel
1 = Right ADC data is output on left
channel
1
Right Digital Audio interface source
0 = Left ADC data is output on right
channel
1 = Right ADC data is output on right
channel
0
Left ADC Invert
0 = Left ADC output not inverted
1 = Left ADC output inverted
0
Right ADC Invert
0 = Right ADC output not inverted
1 = Right ADC output inverted
The input data source for each DAC can be changed under software control using register bits
AIFDACL_SRC and AIFDACR_SRC. The polarity of each DAC input may also be modified using
register bits DACL_DATINV and DACR_DATINV. These register bits are described in Table 28.
REGISTER BIT
ADDRESS
LABEL
R24 (18h)
12 DACL_DATINV
Audio
Interface 0
11 DACR_DATINV
5
AIFDACL_SRC
4 AIFDACR_SRC
Table 28 DAC Routing and Control
DEFAULT
DESCRIPTION
0
Left DAC Invert
0 = Left DAC output not inverted
1 = Left DAC output inverted
0
Right DAC Invert
0 = Right DAC output not inverted
1 = Right DAC output inverted
0
Left DAC Data Source Select
0 = Left DAC outputs left interface data
1 = Left DAC outputs right interface data
1
Right DAC Data Source Select
0 = Right DAC outputs left interface data
1 = Right DAC outputs right interface
data
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PP, Rev 3.3, September 2012
63