Samsung STH-A225 Service Manual Download Page 46

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SAMSUNG Proprietary-Contents may change without notice

10-8

STH-A225

Circuit Description & Circuit Diagrams

2-5. Radio component control

U101 monitors the state of the radio part, and delivers the information to U203. Then, U203 sends the
proper control signals to radio relating regulators and AGCs. The radio interface signals are summarized in
the Table 2.

Table 2. Radio Interface Signals

Signal Name

Source/Destination

Function

PON_LD

BEC/RFIC

Limiter/Discriminator power control

TX_RFBAND

BEC/IF VCO

Tx band control (0=PCS, 1=Cell)

VCTCXO_IN

TCXO/BEC

14.4 MHz clock

VCTCXO_PC

BEC/TCXO

14.4 MHz clock power control

PLL_DATA

BEC/RFIC

PLL serial data

PLL_CLK

BEC/RFIC

PLL serial clock

PLL_STRB1

BEC/RFIC

PLL serial strobe

RF_BAND

BEC/Various

Cell/PCS band select (0=Cell, 1=PCS)

PREAMP_G

BEC/Regulator

Rx AGC Gain step

RX_BAT

BEC/RFIC

Receiver power control

TX_BAT

BEC/RFIC

Transmitter power control

ANALOG_DIG

BEC/Oscillators

Band control (0=Analog, 1=Digital)

LOCK_DET

RFIC/BEC

PLL lock detect status

PLL_ON

BEC/Regulator

PLL power control(V_RF1:RFIC)

A_IF_IN

RFIC/IFC

IF comparator input

RX_Q, RX_QN

RFIC/IFC

Differential analog receive Q channel

RX_I, RX_IN

RFIC/IFC

Differential analog receive I channel

TX_Q, TX_QN

IFC/RFIC

Differential analog transmit Q channel

TX_I, TX_IN

IFC/RFIC

Differential analog transmit I channel

MOD

IFC/RFIC

Drive to modulator

TX_PWR

Detector/IFC

Tx power detector

RSSI

RFIC/IFC

Rx Signal Strength Indicator

AFC_OUT

IFC/VCTCXO

Auto Frequency Control voltage

AGC_OUT

IFC/RFIC

Auto Gain Control voltage

PA_CNT

IFC/RFIC

Power Amplifier control voltage

DEMOD

RFIC/IFC

Discriminator output

TXDA_REF

RFIC/IFC

Tx section common mode DC bias

PON_TX

BEC/Regulator

TX up converter power (V_RF2:RFIC)

PON_VRF3

BEC/Regulator

Local Amp power(V_RF3:RFIC)

Summary of Contents for STH-A225

Page 1: ...225 2 C ABC 4GHI 1 3DEF 5JKL 6MNO 7PQRS 8TUV 0 9WXYZ Manual TDMA MOBILE TELEPHONE CONTENTS 1 Trouble Shooting 2 Electrical Parts List 3 Exploded Views and Parts List 4 Block Diagrams 5 PCB Diagrams 6 Circuit Description Circuit Diagrams ...

Page 2: ... Samsung Electronics Co Ltd December 2001 Pinted in Korea Code No GH68 01930A BASIC ELECTRONICS ...

Page 3: ...ome S W N Need to check Q204 U311 N Need to replace Memory U206 N Need to check neighbor part Need to check OSC302 U202 neighbor part Press END Key Y Y Y Y Y Y ON_SW H VBAT 3 2V VCTCXO_IN 14 4 MHz 32K_XIN 32 768 kHZ Memory U206 control signal OK VCC 3 0V V_VCTCXO 3 0V RST 3 0V IVCC 2 2V BOOT H Program Running VCC ADD 0 21 DATA 0 15 FLASH_CS SRAM_CS UBE MEMOEB MEMWEB ...

Page 4: ...l Signal OK Y Y EL_EN H N Y EL Back light OK VCC ADD 2 DATA 0 7 DISPLAY_CS RST LCD Display Running Send Command EL enable Test mode 176 N Need to check CN101 Y Y VIBRATOR H N Replace LCD module Y Vibrator Run OK LCD Display Running EL Back lingt Running Send Command Vibrator enable Test mode 180 N Need to check CN101 neighbor part Y SPK SPK Signal OK LCD EL Vibrator OK Send Command Main Audio Rece...

Page 5: ... check CN102 1 Q102 neighbor part Press Keys Y Y Key Dispaly OK Y Key Display Good Send Command Main Audio Path ON Test mode 031 131 136 187 Talking Voice at MIC N Need to check CN102 1 neighbor part Y Y Y LED Operation OK Key Display Good Mic Path Good Send Command ALT_LED_ON Send Command SVC_LED_ON Send Command LED_ON Test mode 178 Audio signal output at Speaker GOOD ...

Page 6: ...ge without notice 1 4 STH A225 Trouble Shooting 1 4 Abnormal Buzzer Operation START Y N Need to check U104 AU101 Y Y Ringer Signal OK Send Command Ringer Path ON Test mode 183 N Replace AU101 Y Buzzer Sound Output OK Buzzer Operation Good ...

Page 7: ...eration START Y N Need to check Q103 U102 neighbor parts Y Y HS_SENSE H Hock Up Ear_Mic Phone in the Jack U313 Send Command MIC_BIAS_EN enable Send Command AMP_EN enable Audio set Path HS Test mode 187 185 032 N Need to check Q103 U102 neighbor parts Y Y SEND_END H Press Button on the Ear Jack Ear_Mic phone Operation Good ...

Page 8: ...out notice 1 6 STH A225 Trouble Shooting 2 RF Section 2 1 Call processing and Online Test N DONE START Y Y Normal SVC Check RX path N Y Set up Call OK Check TX path N Y Measure SINAD BER Good Check RX path N Y Measure Tx Power Good Check TX path ...

Page 9: ...eck F306 U301_8 54dBm N Need to check F304 neighbor parts Y RF_BAND L RX_BAT H PLL_ON H PON_LC H VCTCXO_PC H IF_ON H PON_VRF3 H set up 8920B basestation for RX test Set Base station RX Lev 50 dBm Send Command RX path ON Send Command channel selecton Test mode 031 START N Y V_LNA_CELL H U208_1 H U207_1 H Need to check U301 neighbor parts F304 input 34dBm 2 U304_45 35dBm ...

Page 10: ...bor parts U304_1 2 3 Need to check U207 neighbor parts N Y Y Y Y Y RF loal check U304_48 Lev 5dBm Freq adjusted freq 1 U304_41 Lev 19dBm Freq 130 05MHz U304_34 Lev 26dBm Freq 130 05MHz N Need to check U304 L303 C308 L301 C307 U304_37 Lev 4dBm Freq 450kHz Y N Replace F301 or Need to check R302 R304 C301 U304_25 Lev 2dBm Freq 450kHz MODE U304_40 42 3 0V 4 3 ...

Page 11: ...0 PON_LD H Case AMPS mode setup basestation for RX test Audio Freq gen 1004Hz FM deviation 2 9kHz 4 Y Y Y U304_16 DEMOD sinusoidal wave Vp p 350mV Freq 1004Hz N Need to check U304 R327 R323 C353 C107 U101_52 DEMOD sinusoidal wave MAX Vp p 1 4V Freq 1004Hz N Replace U203 Y U101_40 BBCLK 6 2208MHz or 4 96NHz or 5 12MHz N Replace U203 Y U101_32RX_CLK BBCLK 2 or BBCLK 8 N Replace U203 Y U101_31 RX_SYN...

Page 12: ...203 Y Y Y U101_40 BBCLK 6 2208MHz or 4 096MHz or5 12MHz Y U101_34 TX_CLK BBCLK 32 or BBCLK 8 Y U101_33 TX_SYNC BBCLK 512 or BBCLK 128 Y U101_33 TX_DATA serial data RF_BAND L TX_BAT H PLL_ON H VCYCXO_PC H IF_ON H PON_TX H PON_VRF3 H setup 8920B as basestaion for TX test audio signal Send command TX path ON Send Command channel selection Test mode 136 131 START AMPS TDMA 2 1 MODE ...

Page 13: ...58 57 TX I Q Quarature signal AC Lev Vp_p 0 4V DC bias Lev 1 5V U101_63 MOD sinusoidal wave MAX Vp p 1 4V Freq 1004Hz OSC303_1 FM modulation out Freq 175 05MHz Audio Freq 1004Hz Need to check OSC303 V_IF_VCO 3 0V N Y N N Y Need to check U304_66 or Replace U304 U304_59 RF OUT measure Level Send command PA_CNT Test mode 132 Level is adjustable N Y Replace F310 U304_59 RF OUT Fc Local_freq 175 05 N Y...

Page 14: ...e U307 U307 Gain around 27dB N Y Replace F309 F309 Insertion loss around 3dB N Y Need to check V_PA_BAIS_CELL U305_5 6 7 3 0V VBATT U305_14 15 16 3 2 1V or Replace U305 U305 Gain around 30dB N Y Need to check F313 neighbor parts F306_1 around same power with U305 output N Y Need to check F313 neighbor parts F306 insertion loss under 3dB N DONE ...

Page 15: ... C109 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C110 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C111 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C112 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C114 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C115 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 000233 C116 C CE...

Page 16: ...2404 001105 C151 C TA CHIP 10 uF 20 6 3 V GP TP 2012 2 2203 000278 C152 C CERAMIC CHIP 0 01 nF 0 5 pF 50 V NP0 TP 1005 2 2203 000330 C153 C CERAMIC CHIP 0 012 nF 5 50 V NP0 TP 1005 2 2203 000278 C154 C CERAMIC CHIP 0 01 nF 0 5 pF 50 V NP0 TP 1005 2 2203 000330 C155 C CERAMIC CHIP 0 012 nF 5 50 V NP0 TP 1005 2 2203 000679 C156 C CERAMIC CHIP 0 027 nF 5 50 V NP0 TP 1005 2 2203 005061 C160 C CERAMIC ...

Page 17: ...20 16 V Y5 V TP 1005 2 2203 005061 C208 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C209 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005065 C210 C CERAMIC CHIP 1000 nF 80 20 10 V Y5 V TP 1608 2 2203 005061 C211 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C218 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C219 C CERAMIC CHIP 100 nF 80 20 16 V Y...

Page 18: ...AMIC CHIP 1 nF 10 50 V X7R TP 1005 2 2203 001153 C307 C CERAMIC CHIP 0 068 nF 5 50 V NP0 TP 1005 2 2203 000278 C308 C CERAMIC CHIP 0 01 nF 0 5 pF 50 V NP0 TP 1005 2 2203 000278 C309 C CERAMIC CHIP 0 01 nF 0 5 pF 50 V NP0 TP 1005 2 2203 005061 C310 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 005061 C311 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 000438 C313 C CERAMIC CHIP 1 nF 10...

Page 19: ...V Y5 V TP 1005 2 2203 000386 C350 C CERAMIC CHIP 0 015 nF 5 50 V NP0 TP 1005 2 2203 000233 C352 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 000489 C353 C CERAMIC CHIP 2 2 nF 10 50 V X7R TP 1005 2 2203 000386 C354 C CERAMIC CHIP 0 015 nF 5 50 V NP0 TP 1005 2 2203 000233 C355 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 005494 C356 C CERAMIC CHIP 220 nF 10 10 V X7R TP 1608 2 2203 005061 C357 ...

Page 20: ... 2 2203 000233 C394 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 000233 C395 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 000628 C396 C CERAMIC CHIP 0 022 nF 5 50 V NP0 TP 1005 2 2203 000278 C397 C CERAMIC CHIP 0 01 nF 0 5 pF 50 V NP0 TP 1005 2 2203 000628 C398 C CERAMIC CHIP 0 022 nF 5 50 V NP0 TP 1005 2 2203 000233 C399 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 000438 C400 C CERAMIC ...

Page 21: ...RAMIC CHIP 8 2 nF 10 16 V X7R TP 1005 2 2203 000254 C445 C CERAMIC CHIP 10 nF 10 16 V X7R TP 1005 2 2404 001151 C449 C TA CHIP 33 uF 20 6 3 V LZ TP 3216 2 2203 000696 C453 C CERAMIC CHIP 0 002 nF 0 25 pF 50 V NP0 TP 1005 2 2203 005061 C454 C CERAMIC CHIP 100 nF 80 20 16 V Y5 V TP 1005 2 2203 000233 C455 C CERAMIC CHIP 0 1 nF 5 50 V NP0 TP 1005 2 2203 000696 C456 C CERAMIC CHIP 0 002 nF 0 25 pF 50 ...

Page 22: ...V 20A 1 x 0 5 x 0 6 mm TP 2 0404 001093 D302 DIODE SCHOTTKY HSMS 282C 1 V 30 mA SOT 323 TP 2 2903 001235 F301 FILTER CERAMIC BP 0 45 MHz 6dB 0 5dB TP 2 2904 001270 F302 FILTER SAW 130 05 MHz 0 024 MHz 10 5KHz 0 5dB TP 2 2904 001173 F304 FILTER SAW 881 5 MHz 25 MHz 12 5MHz 2dB TP 12 5MHz 3 5dB 2 2909 001119 F306 FILTER DUPLEXER 881 5 MHz 836 5 MHz 4 3dB TP 56dB 40dB 2 2904 001172 F309 FILTER SAW 83...

Page 23: ...02028 L324 INDUCTOR SMD 12 nH 5 1 0 x 0 5 x 0 5 mm 2 2703 002039 L325 INDUCTOR SMD 16 nH 5 2 29 x 1 73 x 1 52 mm 2 2703 001722 L326 INDUCTOR SMD 18 nH 5 1 0 x 0 5 x 0 5 mm 2 2703 001747 L327 INDUCTOR SMD 4 7 nH 0 3 nH 1 0 x 0 5 x 0 5 mm 2 2703 001733 L334 INDUCTOR SMD 8 2 nH 5 1 x 0 5 x 0 5 mm 2 2703 001786 L335 INDUCTOR SMD 10 nH 5 1 0 x 0 5 x 0 5 mm 2 2703 001729 L338 INDUCTOR SMD 1 8 nH 0 3 nH ...

Page 24: ...A TP 1005 2 2007 007771 R110 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 007771 R111 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 008037 R112 R CHIP 57 6 kohm 1 1 16 W DA TP 1005 2 2007 007771 R113 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 000151 R114 R CHIP 15 kohm 5 1 16 W DA TP 1005 2 2007 000758 R115 R CHIP 330 kohm 5 1 16 W DA TP 1005 2 2007 000758 R116 R CHIP 330 kohm 5 1 16 W DA TP 1005 2 2007 000758 ...

Page 25: ... 5 1 16 W DA TP 1005 2 2007 000162 R145 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000162 R146 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000029 R202 R CHIP 0 ohm 5 1 10 W DA TP 2012 2 2007 000170 R203 R CHIP 1 Mohm 5 1 16 W DA TP 1005 2 2007 000172 R206 R CHIP 10 ohm 5 1 16 W DA TP 1005 2 2007 000636 R207 R CHIP 270 kohm 5 1 16 W DA TP 1005 2 2007 000157 R208 R CHIP 47 kohm 5 1 16 W DA TP 1005 2 ...

Page 26: ...W DA TP 1005 2 2007 000157 R239 R CHIP 47 kohm 5 1 16 W DA TP 1005 2 2007 000758 R240 R CHIP 330 kohm 5 1 16 W DA TP 1005 2 2007 007771 R241 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 000162 R242 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000162 R243 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000162 R244 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000162 R245 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007...

Page 27: ...00 kohm 5 1 16 W DA TP 1005 2 2007 007771 R278 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 000173 R279 R CHIP 22 ohm 5 1 16 W DA TP 1005 2 2007 007771 R280 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 000148 R281 R CHIP 10 kohm 5 1 16 W DA TP 1005 2 2007 007771 R282 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 001319 R301 R CHIP 1 2 kohm 5 1 16 W DA TP 1005 2 2007 007771 R302 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 ...

Page 28: ... 5 1 16 W DA TP 1005 2 2007 000172 R332 R CHIP 10 ohm 5 1 16 W DA TP 1005 2 2007 000143 R333 R CHIP 4 7 kohm 5 1 16 W DA TP 1005 2 2007 000138 R334 R CHIP 100 ohm 5 1 16 W DA TP 1005 2 2007 000566 R336 R CHIP 220 kohm 5 1 16 W DA TP 1005 2 2007 000148 R337 R CHIP 10 kohm 5 1 16 W DA TP 1005 2 2007 007771 R338 R CHIP 0 ohm 5 1 16 W DA TP 1005 2 2007 000140 R339 R CHIP 1 kohm 5 1 16 W DA TP 1005 2 2...

Page 29: ...7 001298 R381 R CHIP 51 ohm 5 1 16 W DA TP 1005 2 2007 000162 R382 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000172 R383 R CHIP 10 ohm 5 1 16 W DA TP 1005 2 2007 000151 R385 R CHIP 15 kohm 5 1 16 W DA TP 1005 2 2007 001333 R386 R CHIP 18 kohm 5 1 16 W DA TP 1005 2 2007 000162 R387 R CHIP 100 kohm 5 1 16 W DA TP 1005 2 2007 000172 R389 R CHIP 10 ohm 5 1 16 W DA TP 1005 2 2007 000172 R390 R CHIP 10...

Page 30: ... 2 1203 002129 U215 IC VOLTAGE REGULATOR 71622 SOT 23 5P 62MIL PLASTIC 2 14 2 26 2 1201 001609 U301 IC RF AMP 2363 SOP 8P 62MIL DUAL 18dB PLASTIC 5 V 2 3705 001178 U302 CONNECTOR COAXIAL SMC JACK 100 Mohm 50 ohm 5DB 2 1205 001986 U304 IC MIXER UPC8015GK 9EU TQFP 80P 472MIL PLASTIC 3 V 2 1201 001634 U305 IC POWER AMP 2162 LCC 16P 157MIL 29dB PLASTIC 5 2 V 2 1201 001006 U306 IC OP AMP 7101 SOT 23 5P...

Page 31: ...UNG Proprietary Contents may change without notice 3 1 3 STH A225 Exploded View and its Parts List 1 Cellular phone Exploded View S A M S U N G S A M S U N G 1 3 4 5 2 6 7 8 10 9 11 15 16 12 13 14 17 18 19 ...

Page 32: ...A SA SA SA SA SA SA SA SA SA SA SA SA SA SA SA SA Description Remark SEC CODE Gold Silver Location No colombia 900mAh GH72 01977B GH72 01977F 6001 000876 GH07 00092A 3101 001239 3001 001220 GH75 00851B GH72 00515J GH75 00848B GH75 00852B GH73 00156G GH73 00547A GH59 00174A GH59 00299A GH72 01980A GH92 00829A GH42 00160B GH75 00849B 6001 001057 GH43 00360B GH72 01977A GH72 01977E 6001 000876 GH07 0...

Page 33: ...UNG Proprietary Contents may change without notice 3 3 3 Test Jig GH80 00614A 4 TC GH44 00145G 110V Mexico Colombia Brazil Serial Cable Power Supply Cable 5 RF Test Cable GH39 00093A 6 Cigarette Lighter Adaptor GH44 00091A 7 Test Cable GH39 00092A ...

Page 34: ...SAMSUNG Proprietary Contents may change without notice 4 1 4 STH A225 Block Diagrams 1 Base Band Part Block Diagram ...

Page 35: ...SAMSUNG Proprietary Contents may change without notice 4 2 STH A225 Block diagrams 2 Radio Part Block Diagram ...

Page 36: ...SAMSUNG Proprietary Contents may change without notice 4 3 STH A225 Block diagrams MEMO ...

Page 37: ...2 C455 C 4 5 6 C457 C 4 5 8 C 4 5 9 C460 C461 C462 C463 C 4 6 4 C465 C 4 6 6 C467 C 4 6 8 C 4 6 9 C 4 7 0 C 4 7 1 C473 C474 C475 C476 C 4 7 7 C478 C479 C480 C483 CN102 D301 D302 F301 F308 F309 F310 F311 F312 F313 F314 L 1 0 1 L 1 0 2 L301 L303 L 3 0 4 L309 L310 L313 L 3 1 5 L 3 1 7 L 3 1 8 L322 L 3 2 3 L 3 2 4 L325 L 3 2 6 L 3 2 7 L 3 2 8 L 3 2 9 L 3 3 0 L332 L 3 3 3 L 3 3 4 L 3 3 5 L 3 3 6 L337 L...

Page 38: ...101 CN201 D101 D102 D103 D 1 0 4 D105 D202 D 2 0 3 D 2 0 4 D 2 0 5 F302 F304 F306 L 1 0 3 L 1 0 4 L105 L302 L305 L 3 0 6 L307 L308 L311 L 3 1 2 L 3 1 4 L316 L 3 3 1 L341 L343 L344 OSC301 Q102 Q103 Q201 Q202 Q203 Q204 Q205 Q301 R 1 1 3 R114 R118 R 1 1 9 R120 R121 R122 R123 R124 R125 R 1 2 6 R127 R128 R132 R133 R134 R135 R136 R137 R 1 3 8 R 1 3 9 R140 R141 R144 R145 R201 R202 R206 R 2 0 8 R 2 0 9 R2...

Page 39: ...eady The main application program is checking all GPIO inputs periodically When press the END key during program is running the BATT and ON_SW signals will be connected This turns on Q204 Therefore ON_SW_SENSE that is connected to GPIO_0_5 U203_ C13 turned logic high to low The BEC checks this signal main application program enter to POWER OFF mode 1 2 BEC U203 interface The BEC U203 is mainly con...

Page 40: ...SAMSUNG Proprietary Contents may change without notice 10 2 STH A225 Circuit Description Circuit Diagrams Figure1 BEC interface and block diagram ...

Page 41: ...terface down loading and data service The UART2 and the JTAG are used for the software debugging The SCI supports the Diagnostic Monitor DM function FLASH ROM inside of U206 The 32Mbit FLASH ROM is used to store code of the application program Using the down loader program this application program can be changed even after the mobile is fully assembled SRAM inside of U206 The 4Mbit SRAM is used to...

Page 42: ...ential circuits in the IFC to minimize noise pickup The speaker output is amplified internally to enable direct connection to the speaker The second audio path connects to the headset jack The headset microphone and speaker are passed to the IFC s auxiliary input and output respectively The headset jack terminals indicate via the HEADSET_SENSE line when the headset is present as well as when the h...

Page 43: ... connected to TXCO OSC302_1 Transmitter Interface The U101 receives TX_DATA1 U101_36 synchronized by control signals TX_SYNC TX_CLK U101_33 34 which come from BEC and translate this data as differential I Q signals TX_IN TX_I TX_QN TX_Q U101_61 60 58 57 or MOD signal U101_63 It transport this data to RF modulation part In addition the U101 uses PA_CNT U101_73 TX_PWR U101_68 for controlling power o...

Page 44: ...ynamic Rx AGC automatic gain controller range the gain of U301 is controlled by PREAMP_G signal coming from U203 resulting in around 30 dB step gain change By checking the RSSI U203 decides to whether turn on U301 or not The amplified signal goes into F304 RF SAW filter in order to suppress the unwanted band data The signal coming out from F304 inflows to the pin 45 1st Rx mixer input of U304 and ...

Page 45: ...03 175 05 MHz IF VCO with the internal IF PLL of U304 In the TDMA mode Tx I Q signals coming from U101 are applied to the I Q modulator The modulated signal goes into the Tx AGC of U304 The Tx AGC has the 65 dB dynamic range The output of the Tx AGC enters the upconverter of U304 For the upconversion the local frequency source from OSC301 dual RF VCO is used as well The typical output power of the...

Page 46: ... BEC Regulator Rx AGC Gain step RX_BAT BEC RFIC Receiver power control TX_BAT BEC RFIC Transmitter power control ANALOG_DIG BEC Oscillators Band control 0 Analog 1 Digital LOCK_DET RFIC BEC PLL lock detect status PLL_ON BEC Regulator PLL power control V_RF1 RFIC A_IF_IN RFIC IFC IF comparator input RX_Q RX_QN RFIC IFC Differential analog receive Q channel RX_I RX_IN RFIC IFC Differential analog re...

Page 47: ...67 BAT_MON BBCLK 40 39 BIN DEMOD 52 AUDCOMRD 3 8 AUDCOMTO 29 AUX_CLK AUX_DATA 27 AUX_MON 65 28 AUX_STRB 53 AVDD1 AVDD2 13 AFC_OUT 71 72 AGC_OUT AGND1 64 AGND2 7 78 AGND3 AGND4 15 AGND5 76 U101 C142 100NF R109 0 R103 18K 1 ZD101 1 2 3 4 5 AVCC 51 R134 R110 0 L101 BATT VCC BATT 68PF C170 C169 68PF C166 C168 68PF C167 68PF 68PF 0 R111 C131 68PF 100PF C178 68PF C123 R107 560K 1 R106 680K 68PF C130 VBA...

Page 48: ...TX 100K R254 HP_PWR C216 NC R224 R246 VCC 22 6 3V 100K C206 C235 33UF R248 100NF R241 NC R253 0 D203 22K ZD205 G2 S1 1 4 S2 U213 D1 6 3 D2 2 G1 5 100 R278 R210 0 10 R258 R272 NC VCC VCC C244 NC C202 100PF C201 100PF R266 100 C219 100NF 5 1 S1 S2 4 VCC U209 6 D1 D2 3 G1 2 G2 0 R282 6 3V C243 C239 33UF 6 3V 33UF 2 2UF C228 6 3V 3 2 C220 2 2UF 6 3V Q201 1 R236 390K R217 22 C227 2 2UF 6 3V VCC R201 NC...

Page 49: ...D GND 5 4 RFIN 1 RFOUT 6 VCC 100NF 18PF C478 C343 C375 470PF C376 33NF C361 100PF C325 1K 15PF R322 R339 47NF C448 470 100PF C459 L323 8 2nH R388 NC C354 15PF C306 1NF 2PF 27K R362 C416 R323 1 5K R327 180K 4 7K R324 100NF C344 100PF 10 C357 1 OUT 2 R307 U302 3 GND1 GND2 4 GND3 5 6 GND4 IN C430 47NF R401 C454 100NF NC R321 10K NC R351 NC 7 VMODE VPD1 6 VPD2 8 C426 GND1 17 GND 4 RFIN 10 RFOUT 1 VCC2...

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