LG Electronics U250 service manual 11 H/W Sub System, RF Interface, RTR6275WCDMATx, GSMTx/Rx

3. TECHNICAL BRIEF

3.11 H/W Sub System

3.11.1. RF Interface

A. RTR6275(WCDMA_Tx, GSM_Tx/Rx)

MSM6245 controls RF part(RTR6275) using these signals.

•SBST : SSBI I/F signals for control Sub-chipset

•PA_ON1 : Power AMP on RF part

•RX0_I/Q_M/P,TX_I/Q_M/P : I/Q for T/Rx of RF

•TX_AGC_ADJ : control the gain of the Tx signal prior to the power amplifier

•DAC_REF : Reference input to the MSM Tx data DACs

XMEM1_CS_N3_SDRAM1_CS_N1_GPIO77	L25
UART3_RFR_N_GPIO87	H6
UART2_DP_RX_DATA_GPIO89		RCV_EN_N
	F18
SYNTH0_GP_PDM0_GPIO92	H18		Close to MSM
SBST1_GPIO93		LCD_IF_MODE_1

TX_AGC_ADJ	H13	2K	R213
TRK_LO_ADJ	L13
TCXO_EN_GPIO94	F19	TCXO_EN	C246
PA_ON0	F17	PA_ON

TX_AGC_ADJ TRK_LO_ADJ

A12

Q_OUT_N B12

Q_OUT A13

I_OUT_N

I_OUT B13

DAC_REF F12

Q_IM_CH1 W23

Q_IP_CH1 V23

I_IM_CH1 V25W25

I_IP_CH1 AA25

Q_IM_CH0 Y25

Q_IP_CH0 AB25

I_IM_CH0

I_IP_CH0 AC25

GP_PDM2_PA_RAN_GE1 D17 GP_PDM1_PA_RAN_GE0 H17

H15

TRST_N D16

TCK F15

TMS D15

TDI

TDO A17

RTCK H16

TX_QM

TX_QP

TX_IM

TX_IP

DAC_REF

RF

RX_QM

RX_QP

RX_IM

RX_IP

PA_R0

33nF

AUX_PCM_CLK_GRFC14_GPIO80	K19	SPK_AMP_EN
	N21
AUX_PCM_DIN_GRFC13_GPIO14
AUX_PCM_DOUT_GRFC12_GPIO103	G4
	J8
AUX_PCM_SYNC_GRFC11_GPIO102	H12
TX_ON_GRFC10		TX_ON
	B4
GRFC8_GPIO11
	T23
GRFC7_GPIO10		ANT_SEL1
	T19
GRFX6_GPIO9		ANT_SEL0
	D11
GRFC5_AUX_SBST_GPIO8
GRFC4_AUX_SBCK_GPIO7	H10
GRFC3_GPIO6	F10
GRFC2_GPIO5	D9	GSM_PA_BAND
	A8
GRFC1_AUX_SBDT_GPIO4		GSM_PA_EN
	B8
GRFC0_GPIO3
BT_CLK_GPIO25	G23	BT_CLK
	F23
BT_SBST_GPIO24		BT_SBST
BT_SBCK_GPIO23	E26	BT_SBCK
BT_SBDT_GPIO22	E25	BT_SBDT
BT_TX_RX_N_GPIO21	H21	BT_TX_RX_N
BT_DATA_GPIO20	R19	BT_DATA

Figure 1.15 Schematic of RF Interface of MSM6245

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