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WM8988 Datasheet(PDF) 32 Page - Wolfson Microelectronics plc

Part # WM8988
Description  Stereo CODEC for Portable Audio Applications
PDF  56 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8988 Datasheet(HTML) 32 Page - Wolfson Microelectronics plc

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WM8988
Production Data
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PD, Rev 4.0, October 2008
32
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R24 (18h)
HPCOM
Control
7
HPCOMEN
0
Enables common mode feedback on
LOUT1 and ROUT1
0: Disable Common Mode Feedback
1: Enable Common Mode Feedback
Table 25 HPCOM Control
LOUT2/ROUT2 OUTPUTS
The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are
independently controlled .
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6:0
LOUT2VOL
[6:0]
1111001
(0dB)
LOUT2 Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0111111 to 0000000 = Analogue MUTE
7
LO2ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R40 (28h)
LOUT2
Volume
8
LO2VU
0
Same as LO1VU
6:0
ROUT2VOL
[6:0]
1111001
(0dB)
ROUT2 Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0111111 to 0000000 = Analogue MUTE
7
RO2ZC
0
Right zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R41 (29h)
ROUT2
Volume
8
RO2VU
0
Same as RO1VU
R24 (18h)
Additional
Control (2)
4
ROUT2INV
0
ROUT2 Invert
0 = No Inversion (0
° phase shift)
1 = Signal inverted (180
° phase shift)
Table 26 LOUT2/ROUT2 Volume Control
LOUT2/ROUT2 COMMON GROUND FEEDBACK (LCOM)
The LOUT2/ROUT2 outputs also have the option of incorporating common ground feedback from the
output signal ground, via a connection to the LCOM input. This common ground feedback signal
should be AC-coupled via a 4.7uF capacitor for headphone loads. AC coupling of these outputs if
they are used as LINE level outputs requires similar 1 to 4.7uF AC coupling capacitors depending
upon LINE load resistance.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R24 (18h)
LCOM
Control
8
LCOMEN
0
Enables common mode feedback on
LOUT2 and ROUT2
0: Disable Common Mode Feedback
1: Enable Common Mode Feedback
Table 27 LCOM Control



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