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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.13.1 Audio amplifier sub system IC with Codec
The WM8990 is an ultra-low power hi-fi Codec designed for multimedia handsets. A powerful 1W
speaker driver can operate in class D or AB modes, providing total flexibility to the system designer.
Low leakage, high PSRR and pop/click suppression enable direct battery connection for the speaker
supply. A flexible input configuration supports two microphone inputs (single-ended or differential), a
stereo line input, and a mono differential line input. Four headphone drivers support fully differential
headset drive, providing excellent crosstalk performance and bass response, maximising stereo
effects, and allowing the removal of large and expensive headphone capacitors. The headphone
outputs can also be configured to drive an ear speaker. A fully differential path to these outputs direct
from the input pins is available to maximise signal quality and minimise power consumption. Stereo
24-bit sigma-delta ADCs&DACs provide hi-fi quality audio playback, with a flexible digital audio
interface supporting most commonly-used clocking schemes. An integrated low power PLL provides
additional flexibility.
Stereo DAC & AMP
Stereo DAC & AMP
R212
DNI
C208
0.1u
22u
C206
1u
C237
C232
1u
0
R214
C239
1u
1u
C207
C236
1u
C227
100u
D4
RIN2
D6
D5
RIN3_GPI8
RIN4_RXP
E5
D2
RON
ROP
E1
ROUT
B5
F1
SCLK
E3
SDIN
SPKGND
B1
C1
SPKN
SPKP
A1
B2
SPKVDD
VMID
C3
GPIO4_DACLRC2
G1
GPIO5_DACDAT2
B3
HPGND
HPVDD
A5
LIN1
D3
C5
LIN2
LIN3_GPI7
C6
LIN4_RXN
B6
C2
LON
D1
LOP
LOUT
B4
F5
MCLK
MICBIAS
A2
E2
MODE
OUT3
A4
C4
OUT4
RIN1
U203
WM8990ECS_RV
F4
ADCDAT
ADCLRC_GPIO1
E4
A3
AGND
A6
AVDD
BCLK
G5
CSB_ADDR
F2
DACDAT
F3
DACLRC
G4
G6
DBVDD
DCVDD
F6
E6
DGND
G2
GPIO3_BCLK2
G3
4.7u
C219
C233
1u
C231
100u
4.7u
C216
1u
C230
FB201
75
C240
47p
0.1u
C214
VAUX_2V9
4.7u
C203
47p
C241
R222
100K
1u
C229
1u
C238
FB205
FB206
TP210
VIO_2V62
VBAT
TP211
VMIC
I2S2_WA0
MIC_P
HS_MIC_P
AMPIN_L
AMPIN_R
I2S2_TX
26M_TVOUT
MCLK_ATI
I2S_CLK
I2S_WS
I2S_SDO
FM_SND_L
FM_SND_R
I2C_SCL
I2C_SDA
HSO_L
HSO_R
MIC_N
SPK_N
SPK_P
HS_MIC_N
Figure 21 Audio amplifier Sub-system IC
Содержание KC550
Страница 1: ...Date May 2008 Issue 1 0 Service Manual Model KC550 Service Manual KC550 Internal Use Only ...
Страница 129: ... 130 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 155: ...LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 156 ...
Страница 182: ...Note ...
Страница 183: ...Note ...