wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 75

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

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Pre-Production
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 37.
The input data source for each DAC can be changed under software control using register bits
DACL_SRC and DACR_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 37.
Table 37 ADC / DAC Routing and Control
DAC INTERFACE VOLUME BOOST
A digital gain function is available at the audio interface to boost the DAC volume when a small
signal is received on DACDAT. This is controlled using register bits DAC_BOOST[1:0]. To prevent
clipping at the DAC input, this function should not be used when the boosted DAC data is expected
to be greater than 0dBFS.
Table 38 DAC Interface Volume Boost
R5 (05h)
R15 (0Fh)
R6 (06h)
R11 (0Bh)
R6 (06h)
REGISTER
ADDRESS
REGISTER
ADDRESS
15
14
1
0
15
14
1
0
11:10
BIT
BIT
AIFADCL_SRC
AIFADCR_SRC
ADCL_DATINV
ADCR_DATINV
DACL_SRC
DACR_SRC
DACL_DATINV
DACR_DATINV
DAC_BOOST
[1:0]
LABEL
LABEL
DEFAULT
0b
1b
0b
0b
0b
1b
0b
0b
00b
DEFAULT
Left Digital Audio channel source
0 = Left ADC data is output on left channel
1 = Right ADC data is output on left channel
Right Digital Audio channel source
0 = Left ADC data is output on right channel
1 = Right ADC data is output on right channel
Left ADC Invert
0 = Left ADC output not inverted
1 = Left ADC output inverted
Right ADC Invert
0 = Right ADC output not inverted
1 = Right ADC output inverted
Left DAC Data Source Select
0 = Left DAC outputs left channel data
1 = Left DAC outputs right channel data
Right DAC Data Source Select
0 = Right DAC outputs left channel data
1 = Right DAC outputs right channel data
Left DAC Invert
0 = Left DAC output not inverted
1 = Left DAC output inverted
Right DAC Invert
0 = Right DAC output not inverted
1 = Right DAC output inverted
00 = 0dB
01 = +6dB (Input data must not
exceed -6dBFS)
10 = +12dB (Input data must not
exceed -12dBFS)
11 = +18dB (Input data must not
exceed -18dBFS)
DAC Input Volume Boost
DESCRIPTION
DESCRIPTION
PP, April 2009, Rev 3.0
WM8400
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