WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 51

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

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Pre-Production
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 14.
Table 14 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 15 DAC Interface Volume Boost
R5 (05h)
R10 (0Ah)
R5 (05h)
REGISTER
REGISTER
ADDRESS
ADDRESS
15
14
1
0
11:10
BIT
BIT
DACL_SRC
DACR_SRC
DACL_DATINV
DACR_DATINV
DAC_BOOST
[1:0]
LABEL
LABEL
DEFAULT
0b
1b
0b
0b
00b
DEFAULT
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, May 2008, Rev 3.1
WM8959
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