wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 43

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
Figure 24 DAC Digital Filter Path
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The analogue output from the DAC can then be mixed with the aux analogue inputs and the ADC
analogue inputs. The mix is fed to the output drivers for headphone or speaker (SPKOUTP/N) or line
(MONOOUT). MONOOUT has an additional mixer which allows it to output a different signals to the
speaker outputs.
DIGITAL PLAYBACK (DAC) PATH
Digital data is passed to the WM8982 via the flexible audio interface and is then passed through a
variety of advanced digital filters as shown in Figure 24 to the hi-fi DAC. The DAC is enabled by the
DACEN register bit.
Table 26 DAC Enable Control
The WM8982 also has a Soft Mute function, which gradually attenuates the volume of the digital
signal to zero. When removed, the gain will ramp back up to the digital gain setting.
Table 27 DAC Control Register
The digital audio data is converted to oversampled bit streams in the on-chip, true 24-bit digital
interpolation filters. The bitstream data enters the multi-bit, sigma-delta DAC, which converts it to a
high quality analogue audio signal. The multi-bit DAC architecture reduces high frequency noise and
sensitivity to clock jitter. It also uses a Dynamic Element Matching technique for high linearity and
low distortion.
R10
DAC Control
R3
Power
Management 3
REGISTER
ADDRESS
REGISTER
ADDRESS
BIT
0
0
2
3
6
BIT
DACPOL
AMUTE
DACOSR
SOFTMUTE
DACEN
LABEL
LABEL
0
0
0
0
0
DEFAULT
DEFAULT
DAC enable
0 = DAC disabled
1 = DAC enabled
DAC output polarity:
0 = non-inverted
1 = inverted (180 degrees phase shift)
Automute enable
0 = Amute disabled
1 = Amute enabled
DAC oversampling rate:
0=64x (lowest power)
1=128x (best performance)
Softmute enable:
0=Enabled
1=Disabled
PP, Rev 3.2, September 2008
DESCRIPTION
DESCRIPTION
WM8982
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