WM8985GEFL Wolfson Microelectronics, WM8985GEFL Datasheet - Page 56

• Manufacturer Part Number: WM8985GEFL
• Description: Audio CODECs Multimedia CODEC with Class D HP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8985GEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8985
Figure 23 DAC Digital Filter Path
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DIGITAL PLAYBACK (DAC) PATH
Table 21 DAC Enable Control
Table 22 DAC Control Register
The analogue outputs from the DACs can then be mixed with the aux analogue inputs and the ADC
analogue inputs. The mix is fed to the output drivers for headphone (LOUT1/ROUT1,
LOUT2/ROUT2) or line (OUT3/OUT4). OUT3 and OUT4 have additional mixers which allow them to
output different signals to the line outputs or back into the record path.
Digital data is passed to the WM8985 via the flexible audio interface and is then passed through a
variety of advanced digital filters as shown in Figure 23 to the hi-fi DACs. The DACs are enabled by
the DACENL/R register bits.
The WM8985 also has a Soft Mute function, which when enabled, gradually attenuates the volume
of the digital signal to zero. When disabled, the gain will ramp back up to the digital gain setting. This
function is enabled by default. To play back an audio signal, it must first be disabled by setting the
SOFTMUTE bit to zero.
R10 (0Ah)
DAC Control
R3 (03h)
Power
Management 3
REGISTER
ADDRESS
REGISTER
ADDRESS
BIT
0
1
0
1
2
3
6
BIT
DACPOL
DACRPOL
AMUTE
DACOSR128
SOFTMUTE
DACENL
DACENR
LABEL
LABEL
0
0
DEFAULT
0
0
0
0
0
DEFAULT
Left channel DAC enable
0 = DAC disabled
1 = DAC enabled
Right channel DAC enable
0 = DAC disabled
1 = DAC enabled
Left DAC output polarity:
0 = non-inverted
1 = inverted (180 degrees phase shift)
Right 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
DESCRIPTION
DESCRIPTION
PD, Rev 4.6, July 2009
Production Data
56