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WM8994ECS/R 데이터시트(PDF) 138 Page - Cirrus Logic

부품명 WM8994ECS/R
상세설명  Multi-channel Audio Hub CODEC for Smartphones
PDF  363 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8994ECS/R 데이터시트(HTML) 138 Page - Cirrus Logic

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WM8994
138
Rev 4.6
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
DCS_ENA_CHAN_0
0
DC Servo enable for HPOUT1L
0 = Disabled
1 = Enabled
R88 (0058h)
DC Servo
Readback
9:8
DCS_CAL_COMPL
ETE [1:0]
00
DC Servo Complete status
0 = DAC Write or Start-Up DC
Servo mode not completed.
1 = DAC Write or Start-Up DC
Servo mode complete.
Bit [1] = HPOUT1R
Bit [0] = HPOUT1L
5:4
DCS_DAC_WR_CO
MPLETE [1:0]
00
DC Servo DAC Write status
0 = DAC Write DC Servo mode
not completed.
1 = DAC Write DC Servo mode
complete.
Bit [1] = HPOUT1R
Bit [0] = HPOUT1L
1:0
DCS_STARTUP_C
OMPLETE [1:0]
00
DC Servo Start-Up status
0 = Start-Up DC Servo mode not
completed.
1 = Start-Up DC Servo mode
complete.
Bit [1] = HPOUT1R
Bit [0] = HPOUT1L
R89 (0059h)
DC Servo
Write Val
15:8
DCS_DAC_WR_VA
L_1 [7:0]
00h
Writing to this field sets the DC
Offset value for HPOUT1R in
DAC Write DC Servo mode.
Reading this field gives the
current DC Offset value for
HPOUT1R.
Two’s complement format.
LSB is 0.25mV.
Range is -32mV to +31.75mV
7:0
DCS_DAC_WR_VA
L_0 [7:0]
00h
Writing to this field sets the DC
Offset value for HPOUT1L in
DAC Write DC Servo mode.
Reading this field gives the
current DC Offset value for
HPOUT1L.
Two’s complement format.
LSB is 0.25mV.
Range is -32mV to +31.75mV
Table 71 DC Servo Enable and Start-Up Modes
DC SERVO ACTIVE MODES
The DC Servo modes described above are suitable for initialising the DC offset correction circuit on
the Headphone outputs as part of a controlled start-up sequence which is executed before the signal
path is fully enabled. Additional modes are available for use whilst the signal path is active; these
modes may be of benefit following a large change in signal gain, which can lead to a change in DC
offset level. Periodic updates may also be desirable to remove slow drifts in DC offset caused by
changes in parameters such as device temperature.
The DC Servo circuit is enabled on HPOUT1L and HPOUT1R by setting DCS_ENA_CHAN_0 and
DCS_ENA_CHAN_1 respectively, as described earlier in Table 71.



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