LG U300 Service Manual page 40

3.10 H/W Sub System
3.10.1 RF Interface
A. RTR6250 (WCDMA_Tx, GSM_Tx/Rx)
MSM6250A controls RF part(RTR6250) using these signals.
• SBST,SBDT,SBCK : SBI I/F signals for control Sub-chipset
• PAON : Power AMP on RF part
• RX_I/Q,TX_I/Q : I/Q for T/Rx of RF
• TX_AGC_ADJ : control the gain of the Tx signal prior to the power amplifier
Q_IM_CH1(Reserved)
Q_IP_CH1(Reserved)
I_IM_CH1(Reserved)
PA_RANGE[1]_GP_PDM[2]
PA_RANGE[0]_GP_PDM[1]
ANT_SEL2_N_GPIO[11]
ANT_SEL1_N_GPIO[10]
ANT_SEL0_N_GPIO[9]
TX_VCO_0_EN_N_GPIO[8]
TX_VCO_1_EN_N_GPIO[7]
UHF_BAND_SEL_GPIO[6]
GSM_PA_BAND_GPIO[5]
GSM_PA_EN_GPIO[4]
UHF_VCO_0_EN_GPIO[3]
BT_TX_RN_N_GPIO[21]
Figure. Schematic of RF Interface of MSM6250A
SPK_AMP_EN
L14
TX_AGC_ADJ
H14
TRK_LO_ADJ
F18
TCXO_EN_GPIO[94] TCXO_EN
B19
PA_ON[0] PA_ON
A13
TX_QM
Q_OUT_N R215
B13
Q_OUT TX_QP 51K
A14
TX_IM
I_OUT_N
B14
TX_IP
I_OUT
U21
U23 RF
V25
W26
I_IP_CH1(Reserved)
Y25
Q_IM_CH0 RX_QM
Y26
Q_IP_CH0 RX_QP
V21
RX_IM
I_IM_CH0
W21
RX_IP
I_IP_CH0
A20
H17
H15
TRST_N
D16
TCK
F15
TMS
D15
TDI
F16
TDO
H16
RTCK
J25
GRFC[14]_GPIO[83]
K23
GRFC[13]_GPIO[82]
J26
GRFC[12]_GPIO[81]
K19
FOLDER_DETECT
GRFC[11]_GPIO[80]
H12
RF_ON_TX_ON
GRFC[10]_TX_ON
B4
ANT_SEL2
T23
ANT_SEL1
R19
ANT_SEL0
D11
H10
F10
D9
A8
B8
G23
BT_CLK
BT_CLK_GPIO[25]
F23
BT_SBST
BT_SBST_GPIO[24]
E26
BT_SBCK_GPIO[23] BT_SBCK
E25
BT_SBDT_GPIO[22] BT_SBDT
G21
BT_TX_RX_N
D26
BT_DATA
BT_DATA_GPIO[20]
BLUETOOTH
C251
0.1u
- 41 -
3. TECHNICAL BRIEF
R213 1K
TX_AGC_ADJ
R214 2K
TRK_LO_ADJ
C249 C250
0.01u 0.033u
VREG_MSMP_2.7V
R216
51K
R217
PA_R0
0
VREG_MSMP_2.7V
GSM_TX_VCO_0_EN_N
GSM_TX_VCO_1_EN_N
GSM_PA_BAND
GSM_PA_EN
R221
51K