WM8594_07 Wolfson Microelectronics Ltd., WM8594_07 Datasheet - Page 31

• Manufacturer Part Number: WM8594_07
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics Ltd.

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DIGITAL MONOMIX CONTROL
Each DAC can be independently set to output a range of mono and stereo options. Each DAC output
channel can output left channel data, right channel data or a mix of left and right channel data.
DE-EMPHASIS
A digital de-emphasis filter may be applied to the DAC outputs when the sampling frequency is
44.1kHz. The de-emphasis filter for each DAC can be applied independently.
CLOCK SWITCHING
The input clocks to the DAC (DACMCLK1, DACMCLK2, DACBCLK1, DACBCLK2, DACLRCLK1,
DACLRCLK2) can be switched between sources if the DACs are required to source data from
multiple DSPs or application processors. Uncontrolled switching of clocks is not recommended as
this can result in glitches being applied to the DACs.
The WM8594 can be configured to ignore the clock inputs so that the clocks can be switched
externally. This means that the WM8594 is not affected by any glitches that arise as a result of
switching clocks. The DACs should be configured to ignore the input clocks for the duration of the
period taken to switch the clocks.
Table 19 Digital Monomix Control
Table 20 De-emphasis Control
Table 21 DAC Clock Switching Control
DAC1_CTRL1
DAC2_CTRL1
DAC1_CTRL1
DAC2_CTRL1
REGISTER
REGISTER
DAC1_CLK
DAC2_CLK
ADDRESS
REGISTER
ADDRESS
ADDRESS
R38
R39
02h
07h
02h
07h
26h
R2
R7
R2
R7
11:10
11:10
BIT
BIT
BIT
6
6
0
0
_DEEMPH
_DEEMPH
SAFE_SW
SAFE_SW
DAC1_OP
_MUX[1:0]
DAC2_OP
_MUX[1:0]
LABEL
LABEL
LABEL
DAC1_
DAC2_
DAC1
DAC2
DEFAULT
DEFAULT
DEFAULT
00
00
0
0
0
0
DAC1 Digital Monomix
00 = Stereo (Normal Operation)
01 = Mono (Left data to DAC1R)
10 = Mono (Right data to DAC1L)
11 = Digital Monomix, (L+R)/2
DAC2 Digital Monomix
00 = Stereo (Normal Operation)
01 = Mono (Left data to DAC2R)
10 = Mono (Right data to DAC2L)
11 = Digital Monomix, (L+R)/2
DAC1 De-emphasis
0 = No de-emphasis
1 = Apply 44.1kHz de-emphasis
DAC2 De-emphasis
0 = No de-emphasis
1 = Apply 44.1kHz de-emphasis
DAC Clock Input Safe Switching
0 = Ignore DAC clock inputs
1 = Use DAC clock inputs
DESCRIPTION
DESCRIPTION
DESCRIPTION
PP Rev 1.0 January 2007
WM8594
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