Audio - LG KC560 Service Manual

3. TECHNICAL BRIEF

3.14. Audio

KC560 Audio signal flow diagram as following diagram.
BBP
PMB8877
BT + FM
3.14.1. Audio amplifier
Audio amplifier sub system IC is an audio power amplifier capable of delivering 1.2 W of continuous
average power into a mono 8
single-ended (SE) loads. The MAX9877 features a 32-step digital volume control and ten distinct output
modes. The digital volume control, output modes (mono/SE/OCL) are programmed through a two-wire
I2C interface that allows flexibility in routing and mixing audio channels.
AUDIO_I N
BB_SND_R
BB_SND_L
FM_SND_R
FM_SND_L
LGE Internal Use Only
MAX
9877
FM
Figure 20 Audio signal flow diagram
load, 50mW per channel of continuous average power into stereo 32
C215
A4
1000p
C214 1u
A5
C216 1u D1
C217 1u
D2
C218 1u C1
C219 1u C2
B2
C221
1u
B3
SDA
C3
SCL
C220 1u
D4
R216 20K
B4
R218 8.2
RCV_ P
R219 8.2
RCV_ N
Figure 21 Audio amplifier PM IC
- 44 -
Ear M I C
VB AT
VB AT
C211 1u
C212 1u C213 1u
C1N
A1
HSO_R
C1P HPR
A2
HSO_L
HPL
INA2
INA1
U200
MAX9877A EWP_ TG45
INB2
D5
INB1 OUT+
B5
BIAS OUT-
SDA
SCL
RXIN+
C226 C227
RXIN-
27p 27p
Copyright © 2008 LG Electronics. Inc. All right reserved.
MIC
SPK
RCV
SPK_ R CV_ P
SPK_ R CV_ N
Only for training and service purposes