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3. HW Circuit Description
3.10.2 Downlink Path
The voice downlink path receives speech samples at the rate of 8 kHz/16kHz from the DSP via the
voice serial interface VSP and converts them to analog signals to drive the external transducers.
Earphone : The earphone amplifier provides a full differential signal on the terminals (EAR_P,
EAR_N)
Headset : Each output amplifier provides a single signal on Headset Left.(HSOL)
Handfree : The 8 Ohms speaker amplifier provides a differential signal on the terminals SPKPA, and
SPKNA then goes to external AMP for SPEAKER(SPKPA, SPKNA)
MICIN
MICIP
HSMIC
MICBIAS
HSMICBIAS
AUXI_FMR
FML
EARN
EARP
HSOL
HSOR
HSOVMID
AUDVMID
FILTERAPLL
SPKPA_1
SPKPA_2
SPKNA_1
SPKNA_2
SPKPD_1
SPKPD_2
SPKND_1
SPKND_2
SPKVDD_1
SPKVDD_2
SPKGND_2
SPKGND_1
TMS
TDO
TDI
TCK
LGE Internal Use Only
F2
MICIN
G2
MICIP
D2
HSMIC
G6
H6
C1
RADIO_R
C2
RADIO_L
L100
100nH
H2
L101
100nH
J2
L102
100nH
G1
F1
TP102
J6
E1
P2
K6
R118
L6
SPKPA
M6
M7
SPKNA
K1
K2
M1
M2
L1
L2
N1
H1
R1
U2
U1
T1
K12
Figure 3-10-2 Downlink Interface of ABB
MICBIAS
R112
0
R113
0
15K
C115
C116
C117
C114
47p
47p
47p
47n
VBAT
C121
C122
0.1u
4.7u
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 32 -
EAR_P
EAR_N
HSOL
C118
C119
C120
4.7n
4.7u
4.7u
Only for training and service purposes
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