Samsung SGH-A500, Service Manual, Page: 13 / 31

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4- 1
4. SGH-A500 Block Diagram
SPEAKER
GSM RX SAW
FILTER
RF SWITCH
GSM
DCS
ANTENNA
CMOS
HBT
HBT
COUPLER
DCS RX SAW
FILTER
ATTENUATER
-1dB
ATTENUATER
-7dB
ATTENUATER
-1dB
vc1
vc2
RF switch
control
logic
TX900_RX1800
TX1800_RX900
VRF1
coupling 값
GSM : -19dB
DCS : -14dB
DCS_TX
GSM_TX
DCS_RX
GSM_RX
APC
APC IC
VS2
TXONPA
TX_POWER
VRF1
VCG
_VINT
Tx VCO
out1(GSM)
out2(DCS)
supply
select
VBAT
ATTENUATER
-6dB
control
save
TIC_FD
VTIC_OUT
Rx VCO
RF_OUT
BSEL
VTUNE
loop filter
IF SAW FILTER(360MHz)
TCXO(13MHz)
vcc
out
VT
(1805~1880MHz)
(935~960MHz)
GSM Band
(890~915MHz)
DCS Band
(1710~1785MHz)
Modulator
Filter
(424 or 428MHz)
Tx
시
GSM Band (1314~1339MHz)
DCS Band (1286~1361MHz)
Rx
시
GSM Band (1295~1320MHz)
DCS Band (1445~1520MHz)
VRF1
TXONPA
VRF2
AFC
OAK+
Equalizer
A51/52
GMSK
Modulator
DAC
DAC
ADC
ADC
Power
Mgmt.
RTC
JTAG/
Debug
Speech&
Channel
Decoding
HR/FR/EFR
Viterbi
HW Accelerator
Speech&
Channel
Encoding
HR/FR/EFR
E-GOLD+(PMB2880)
DAC
ADC
Control
System Interface
C166CBC
RF Output
Power Control
10bit DAC
GSM
Scheduler
DAC
Clock
Generation
F13M
PLLON
PAOUT
TX900_RX1800
TX1800_RX900
TXONPA
TEMP
M
U
X
Osc
32.768kHz
F32K RTCOUTIF32KX RTCOUT
XTAL
32.768kHz
I2C bus
interface
control
INTOUT
RESET VSSD VDDCH
Reference
LINT(LDO)
LANA(LDO)
LSIM(LDO)
LRTC(lin.)
SDBB
(step-
down)
VBATS
CHG
charge
control
VCHC VCHS VDDPW SW FB VSSPW VDDA VINT VANA V3V VRTCVSIM
LRF1(LDO) LRF2(LDO)
VDDRF VRF1VRF2 VSSA BYP IREF VSSR
T1
AC
adapter Rsence
154k
100nF
E-POWER
VBAT
Keypad
SIM
CARD
MEMORY
YAMAHA
CHIP
2 EPP1
EPN1
MICP1
MIC.
Keypad
Interface
10
KP0
~KP9
HEAD
SET
VBAT
EPP2
MICP2
POWER ON
MOTOR
FLIP IC
CCRST
VSIM
CCLK CCIO
DISP_RST
DISP_RS
DISP_CS
DISP_SCLK
DISP_SID
LED_CTL
MOTOR_EN
VBAT
FLIP_SNS
VINT
D0~D7
LCD
module
VBAT
EPP1
EPN1
POLY_EN
POLY_CLK
POLY_IRQ
POLY_RST
RDQ
WRQ
A(1)
VBAT
EPP2 V3V
A(0)~
A(22)
D(0)~
D(15)
WRQ
RDQ
FLASH_WR FLASH_SEL
SRAM_
SEL
BHEQ
RESETQ
F-RY_BY
V3V
RTCOUT
SCL SDA VCXOEN
EP_SDA
EP_SCL
VCXOEN
ON
EP_INT
VRTC
VANA
VRF2
VC-TCXO-208C
TFS360F
SAFSE1G84KA0T00R1S
SAFSD942MCM0T00R1S
LMC33-07A0524A
PCF5079HK
VOF1748c28DKB
MQE959A1G32
LRS1380
CX77301
YMU759-QE2
VDD_SD
RX1X
RX3
RX3X
VCC6
MIXI
MIXIX
LNAON
VCC2
RX2
GNDLNA
RX1
CPTX
VCXO
VCXOX
VCXOEN
TEMP
IFI
IFIX
LNAGAIN
CPLO2
VCC3 MOX
MO
GND
CLK EN DA
CPLO1
VDD EFIL
FL
EFILX LO1X
LO1
OWS
GND
GND
BX
B
AX
A
VCC4/5
REFR
PLLON
BSW
FSYS
VCCVCXO
GND
VCXO 13MHz
TEMP
Div.
by
13/26
Div.
by 4
Div.
by 4
IF-
PLL
PFD
RF-
PLL
LO-Buffer
LNA1800
LNA900
LO-Buffer
LO-Buffer
RX-IRM
GSM1800
RX-IRM
GSM900
TX-Mixer
VCO
BBPGC
BBPGC
3-WIRE-BUS
IFPGC
Rx-Demod
Tx-mod
RX-TX-LO2
Tx900_Rx1800 Tx1800_Rx900 Switchplexer State
Switchplexer Truth
Table
VC1 VC2
H L
H H
L H
H H
L L
EGSM_Tx
EGSM_Rx
DCS_Tx
DCS_Rx
NO R-Tx
L
L
L L
L
L
H
H
H
H