wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 77

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
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When using either of the DC Servo options above, the status of the DC offset correction process is
indicated
DCS_STARTUP_COMPLETE and DCS_DAC_WR_COMPLETE fields.
The DC Servo control fields associated with start-up operation are described in Table 48. It is
important to note that, to minimise audible pops/clicks, the Start-Up and DAC Write modes of DC
Servo operation should be commanded as part of a control sequence which includes muting and
shorting of the headphone outputs; a suitable sequence is defined in the default Start-Up sequence.
R67 (43h)
DC Servo 0
R68 (44h)
DC Servo 1
REGISTER
ADDRESS
by
the
BIT
3
2
1
0
7
6
5
4
3
2
1
DCS_CAL_COMPLETE
DCS_TRIG_STAR
DCS_TRIG_STAR
DCS_TRIG_STAR
DCS_TRIG_STAR
DCS_TRIG_DAC_
DCS_TRIG_DAC_
DCS_TRIG_DAC_
DCS_ENA_CHAN
DCS_ENA_CHAN
DCS_ENA_CHAN
DCS_ENA_CHAN
LABEL
TUP_3
TUP_2
TUP_1
TUP_0
WR_3
WR_2
WR_1
_3
_2
_1
_0
DEFAULT
field;
0
0
0
0
0
0
0
0
0
0
0
this
DC Servo enable for LINEOUTR
0 = disabled
1 = enabled
DC Servo enable for LINEOUTL
0 = disabled
1 = enabled
DC Servo enable for HPOUTR
0 = disabled
1 = enabled
DC Servo enable for HPOUTL
0 = disabled
1 = enabled
Writing 1 to this bit selects Start-Up
DC Servo mode for LINEOUTR.
In readback, a value of 1 indicates
that the DC Servo Start-Up correction
is in progress.
Writing 1 to this bit selects Start-Up
DC Servo mode for LINEOUTL.
In readback, a value of 1 indicates
that the DC Servo Start-Up correction
is in progress.
Writing 1 to this bit selects Start-Up
DC Servo mode for HPOUTR.
In readback, a value of 1 indicates
that the DC Servo Start-Up correction
is in progress.
Writing 1 to this bit selects Start-Up
DC Servo mode for HPOUTL.
In readback, a value of 1 indicates
that the DC Servo Start-Up correction
is in progress.
Writing 1 to this bit selects DAC Write
DC Servo mode for LINEOUTR.
In readback, a value of 1 indicates
that the DC Servo DAC Write
correction is in progress.
Writing 1 to this bit selects DAC Write
DC Servo mode for LINEOUTL.
In readback, a value of 1 indicates
that the DC Servo DAC Write
correction is in progress.
Writing 1 to this bit selects DAC Write
DC Servo mode for HPOUTR.
In readback, a value of 1 indicates
that the DC Servo DAC Write
correction is in progress.
is
PD, Rev 4.0, September 2010
the
DESCRIPTION
logical
OR
WM8918
of
77
the