LG KP500 - Page 48

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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
3.12.1 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 8Ω load, 50mW per channel of continuous average power into stereo 32Ω
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.
A
UDI
O
A
M
P S
U
B
S
Y
ST
E
M & S
IG
N
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L
D
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T
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R
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2
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C1
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5
OUT+
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UT-
B5
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G
N
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C
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D4
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R
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-
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4
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SD
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D
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SS
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3
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2
0
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8
7
7
A
EWP
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TG4
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US
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AS
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D
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PL
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p
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6
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1
9
0
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T
u1
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.
2
VBAT
2.
8
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3
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_
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KPS
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R_
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P
S
L
_
DNS_MF
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E
N
_
RA
E
L_
OS
H
R_
OS
H
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DNS_
B
B
R
_
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LC
S
_
C2
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A
D
S_
C
2
I
Figure 17 Audio amplifier PMIC