Samsung SCH-211 Service Manual

CDMA PORTABLE CELLULAR TELEPHONE

SCH-211

SERVICE

Manual

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MNO

ABC

DEF

PQRS

TUV

OPER

WXYZ

PWR

CLR

SEND

END

CDMA

CDMA PORTABLE CELLULAR TELEPHONE

CONTENTS

1. General Introduction

2. Specification

3. Installation

4. NAM Programming

5. Circuit Description

6. Troubleshooting

7. Exploded Views and Parts List

8. PCB Diagrams

9. Electrical Parts List

10. Block & Circuit Diagrams Samsung Electronics Co.,Ltd.

GH68-00335A

ELECTRONICS

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Specification

1. General Introduction

Samsung Electronics-Contents may change without notice. 1-1

The SCH-211 cellular phone functions as both analog cellular phone working in AMPS (Advanced Mobile Phone Service) mode and digital cellular phone working in CDMA (Code Division Multiple Access) mode. CDMA type digital mode applies DSSS (Direct Sequential Spread spectrum) mode which first came to be used in the military. The DSSS reduces channel cross talk and allow to use one frequency channel by multiple users in the same specific area, resulting in increase of channel capacity to about ten times compared to that of analog mode currently used.

Soft/Softer Handoff, Hard Handoff, and Dynamic RF Power Control technologies are combined into this phone to reduce the call drop while usage.

CDMA digital cellular network consists of MSO (Mobile Switching Office), BSC (Base Station Controller), BTS (Base Station Transmission System), and MS (Mobile Station). MS meets the specifications of the below: ¥ UIS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum

Cellular System ¥ UIS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems ¥ UIS-98A : Standards for Dual-Mode Wideband Spread Spectrum Cellular Mobile Station ¥ UIS-126 : Mobile Station Loopback Service Options Standard

SCH-211 is composed of main handset, rapid charger, cradle, two batteries (1300 mAh, 850 mAh), hands-free kit, and travel charger. Hands-Free Kit is designed to be operated in half-duplex mode taking turn-around delay between the phone and the system into account.

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General Introduction

MEMO

2. Specification

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2-1 General

Frequency Range Digital Mode Analog Mode

Transmitter : 824.64 ~ 848.37 MHz 824.04 ~ 848.97 MHz

Receiver : 869.64 ~ 893.37 MHz 869.04 ~ 893.97 MHz Channel Spacing : 1.23 MHz 30 kHz Number of Channels : 20 FA 832 CHs Duplex Spacing : 45 MHz Frequency Stability : ± 2.5 ppm (– 30 °C ~ + 60 °C : -22 °F ~ 140 °F)

Operating Temperature : – 20 °C ~ + 50 °C (–4 °F ~ 122 °F) Operating Voltage

HHP : 7.2V DC (± 10 %)

Hands-free : 13.7V DC (± 10 %) Size and Weight

including standard battery : 130 ✕ 51 ✕ 27.5 mm, 205 g (5.12 ✕ 2 ✕ 0.94 inch, 7.2 oz)

including extended-life battery : 130 ✕ 51 ✕ 37 mm, 207 g (5.12 ✕ 2 ✕ 1.46 inch, 7.4 oz)

Operating Time

Digital mode Standby Time : about 50 ~ 55 hours (with standard battery)

: about 85 ~ 90 hours (with extended-life battery)

Talk Time : about 150 min (with standard battery)

: about 250 min (with extended-life battery)

Analog Standby Time : about 10 ~ 12 hours (with standard battery)

: about 16 ~ 18 hours (with extended-life battery)

Talk Time : about 100 min (with standard battery)

: about 170 min (with extended-life battery)

2-2 Analog Mode

TRANSMITTER

RF output power : 0.6 W (+2/–4 dB) Carrier ON/OFF Conditions

“ON” Condition : within ± 3 dB of specification output (in 2mS)

“OFF” Condition : below – 60 dBm (in 2mS) Compressor

Compression Rate : 2:1

Attack Time : 3 mS

Recovery Time : 13.5 mS

Reference Input : Input level for producing a nominal ±2.9 kHz peak frequency

deviation of transmitted carrier

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Specification

Preamphasis : 6 dB/OCT within 0.3 ~ 3 kHz Maximum Frequency Deviation

F3 of G3 : ± 12 kHz (± 10 %)

Supervisory Audio Tone : ± 2 kHz (± 10 %)

Signaling Tone : ± 8 kHz (± 10 %)

Wideband Data : ± 8 kHz (± 10 %)

Post Deviation Limiter Filter

3.0 kHz ~ 5.9 kHz : above 40LOG (F/3000) dB

5.9 kHz ~ 6.1 kHz : above 35 dB

6.1 kHz ~ 15 kHz : above 40LOG (F/3000) dB

Over 15 kHz : above 28 dB

Spectrum Noise Suppression

For All Modulation

f0+ 20 kHz ~ f0+45 kHz : above 26 dB

For Modulation by Voice and SAT

+45 kHz : above 63 +10LOG (Py) dB

For Modulation by WBD (without SAT) and ST (with SAT)

+45 kHz ~ f0+60 kHz : above 45 dB

+60 kHz ~ f0+90 kHz : above 65 dB

+90 kHz ~ 2f

: above 63 +10LOG (Py) dB

(where f

= carrier frequency

Py= mean output power in watts)

Harmonic and Conducted Spurious Emissions : above 43 +10LOG (Py) dB

RECEIVER

DE-Emphasis : – 6 dB/OCT within 0.3 ~ 3 kHz Expander

Expansion Rate : 1:2

Attack Time : within 3 ms Recovery Time : within 13.5 ms Reference Input : Output level to a 1000 Hz tone from a carrier within ±2.9

kHz peak frequency deviation Sensitivity : 12 dB SINAD/–116 dBm Intermodulation Spurious Response Attenuation : above 65 dB RSSI Range : above 60 dB Protection Against Spurious Response Interference : above 60 dB In Band Conducted Spurious Emissions

Transmit Band : below – 60 dBm Receive Band : below – 80 dBm

Out of Band Conducted Spurious Emissions : below – 47 dBm

Radiated Spurious Emissions

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Specification

Frequency Range

25 ~ 70 MHz

70 ~ 130 MHz 130 ~ 174 MHz 174 ~ 260 MHz 260 ~ 470 MHz

470 ~ 1 GHz

Maximum Allowable EIRP

– 45 dBm – 41 dBm

– 41 ~ – 32 dBm

– 32 dBm

– 32 ~ – 26 dBm

– 21 dBm

2-3 Digital Mode

Waveform Quality : above 0.944 Time Reference : within ± 1uS RX Sensitivity : – 104 dBm, FER = within 0.5% Dynamic Range : – 104 dBm ~ – 25 dBm, FER = within 0.5% TX Output Power : Maximum 320 mW (25dBm) TX Frequency Deviation : within ± 300 Hz Occupied Band Width : 1.32 MHz TX Conducted Spurious Emissions : 900 kHz below – 42 dBc / 30 kHz

: 1.98 MHz below – 54 dBc / 30 kHz Minimum TX Power Control : below – 50 dBm Open Loop Power Control : – 25 dBm – 57.0 dBm ~ – 38.5 dBm

– 65 dBm – 17.5 dBm ~ + 1.5 dBm

– 104 dBm + 18.0 dBm ~ + 30.0 dBm Standby Output Power : below – 61 dBm Closed Loop TX Power Control Range : Test 1 beyond ± 24 dB

Test 2 0 mS ~ 2.5 mS

Test 3 beyond ± 24 dB

Test 4 beyond ± 24 dB

Test 5 beyond ± 24 dB

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Specification

MSC Transmitter Frequency

FANO. CH. NO. CENTER FREQUENCY FANO. CH. NO. CENTER FREQUENCY

1 1011 824.640MHz 11 404 837.120MHz 2 29 825.870MHz 12 445 838.350MHz 3 70 827.100MHz 13 486 839.580MHz 4 111 828.330MHz 14 527 840.810MHz 5 152 829.560MHz 15 568 842.040MHz 6 193 830.790MHz 16 609 843.270MHz 7 234 832.020MHz 17 650 844.270MHz 8 275 833.250MHz 18 697 845.910MHz 9 316 834.480MHz 19 738 847.140MHz

10 363 835.890MHz 20 779 848.370MHz

MSC Receiver Frequency

FANO. CH. NO. CENTER FREQUENCY FANO. CH. NO. CENTER FREQUENCY

1 1011 869.640MHz 11 404 882.120MHz 2 29 870.870MHz 12 445 883.350MHz 3 70 872.100MHz 13 486 884.580MHz 4 111 873.330MHz 14 527 885.810MHz 5 152 874.560MHz 15 568 887.040MHz 6 193 875.790MHz 16 609 888.270MHz 7 234 877.020MHz 17 650 889.270MHz 8 275 878.250MHz 18 697 890.910MHz 9 316 879.480MHz 19 738 892.140MHz

10 363 880.890MHz 20 779 893.370MHz

2-4 CDMA Debug Display Information (menu 8)

2-5 FM Debug Display Information (menu 8)

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Specification

IN IDLE MODE

SIDxxxxx SIx x T– xx Rxxx – xx Pxxx CHxxxx

➀➁➂

➃

➆➄

➅ ➇

SIDxxxxx x PWR x RSSIxxx SATx CHxxxx

➀➂

➁

➂

➅

➄

IN CONVERSATION MODE

SVx RVx xx x T – xx Rxxx – xx Pxxx CHxxxx

➈⑩

➂

➀ Sxxxxx : SID (System ldentification) toggle

Nxxxxx : NID (Network Identification) toggle

➁ Slx : Slot cycle index (lowest between the system

and the phone will be used)

➂ Handset Status : 0 - Acquisition

1 - Synchronization 2 - Paging (Idle) 3 - Traffic Initialization 4 - Traffic Mode 5 - Exit

➃ T-xx : Tx adjust, Value ranges from +63 ~-63dB ➄ Dxxx or Rxxx : sector power in dBm ➅ -xx : e

c/Io

➆ Pxxx : PN offset or Pilot # ➇ CHxxxx : channel number ➈ TV : Tx vocoder rate (8 is full rate, 1 is 1/8th rate) ⑩ RV : Rx vocoder rate (8 is full rate, 1 is 1/8th rate)

xx : Walsh code used in traffic channel

➀ SIDxxxxx : FM Home System ID ➁ PWRx : Power Level 0~7 ➂ SATx : Supervisory Audio Tone code (0~3) ➃ x (Using Frequency Band) : ABand or B Band ➄ RSSIxxx : RSSI value ➅ CHxxx : Using Channel

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Specification

MEMO

3. Installation

3-1 Installing a Battery Pack

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1. To attach the battery pack after charging, align

it with the phone about 1cm (1/2Ó) away from its place so that the two arrows on the phone are seen, the battery charge contacts pointing downward.

2. Slide the battery pack upwards until it clicks

firmly into position. The phone is now ready to be turned on.

3. To remove the battery pack, release it by pressing the button on the rear of the phone.

4. Slide the battery pack downward about 1cm (1/2Ó) and lift it away from the phone.

3-2 For Desk Top Use

1. Choose a proper location to install the charger for desk top use.

2. Plug the power cord of the charger into an appropriate wall socket. When the power is connected correctly, the lamps turn on briefly.

3. To charge the battery pack, insert the battery pack into the rear slot of the charger. The lamp marked BAT on the front panel of the charger lights up red.

4. If you do not wish to use the phone while charging the battery, insert the phone with the battery pack attached into the front slot of the charger. The lamp marked PHONE on the front panel of the charger lights up red.

Press this button to release the battery pack

SCH-211 MAIN

Standard Battery Pack

Extended Battery Pack

SAMSUNG

Figure 3-1 Charging the Phone and Battery

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Installation

Item Model Name

Service Part#

Desk Top Rapid Charger DTC58 GH44-40034A

Standard Battery Pack BTL850SB GH43-10104A

Extended Battery Pack BTL1350EB GH43-10103A

SPECIFICATIONS USING ”DTC 58”

Product Charging time Stand by time (hours) Talking time (min)

(hours) Digital Analog Digital Analog

Standard Battery Pack (Li-ion: 800mAh) 2 ~ 3 50 ~ 55 10 ~ 12 150 100

Extendard Battery Pack (Li-ion: 1350mAh)

2.5 ~ 3.5 85 ~ 90 16 ~ 18 250 170

3-3 For Mobile Mount

3-3-1 Antenna

1. Choose a proper location to install the antenna.

¥ UThe center of the roof top provides the

best performance.

¥ UThe edge of the rear trunk also provides a

good performance. However, the antenna should be higher than the roof of the car.

¥ UIn case of on-glass antenna, you should

align the antenna base with the round plate to connect the cables correctly.

2. Mount the antenna vertically, connect the antenna cable.

3. Tighten the antenna nut fully.

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Installation

3-3-2 Cradle

1. Choose a location where it is easy to reach and does not interfere with the driverÕs safe operation of the car.

2. Separate the two halves of the clamshell by removing the two large slotted screws. See the figure 3-2.

3. Drill holes and mount the lower half of the clamshell by using the screws.

4. Place the cradle onto the remaining half of the clamshell and assemble them by using the screws.

5. Reassemble the two halves of the clamshell together. Adjust the mounting angle and tighten the two slotted screws.

Vehicle

Cradle

To Antenna

To Cellular Telephone

To Hands-free Box

32 mm

Figure 3-2 Cradle Installation

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Installation

3-3-3 Hands-Free Box

1. Drill holes in a proper location for the handsfree box, attach the mounting bracket by using the screws. See the figure 3-3.

2. Install the hands-free box into the bracket.

3-3-4 Hands-Free Microphone

1. It is recommended to install the microphone where it is 30-45 cm (12-18Ó) away from the driver. Choose the location where is least susceptible to interference caused by external noise sources, ie, adjacent windows, radio speakers, etc. Normal place is the sun visor.

2. Once the microphone has been correctly positioned, connect the microphone wire to the MIC jack on the hands-free box.

Figure 3-3 Hands-Free Box Installation

56 mm

40 mm

Mounting Bracket

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Installation

3-3-5 Cables

1. Connect the cradle and the hands-free box with the data cable. See the figure 3-4.

2. Connect the antenna cable to the RF jack of the cradle.

3. Connect the power cable as follows: Connect the red wire to the battery (+) terminal, black wire to the battery (-) terminal. Then connect the orange wire to the switched side of the ignition switch, and then connect the brown wire to the stereo mute wire from your vehicle stereo.

4. Connect the other end of the power cable to the PWR jack of the hands-free box.

Notes:

¥ It is recommended to connect the power cable

directly to the battery to avoid power noise.

¥ Make sure the connection, in the vehicle,

between the battery (-) terminal and vehicle chassis is made correctly.

¥ Make sure the fuse having a proper capacity is

used on the power cable.

¥ Make sure the cables do not pass over any sharp

metal edge that may damage it.

PWR

RED

3A FUSE

BAT.(+)

BAT.(-)

BLACK

IGN. Switch

ORANGE

STEREO Mute

BROWN

SAMSUNG

Figure 3-4 Cable Connections

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Installation

MEMO

4. NAM Programming

4-1 Quick NAM Programming

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LCD Display Key in Function

Enter Lock

NAM Program 1:Setup NAM1 2:Setup NAM2

phone # 1234567890

Mobile ID # 1234567890

Anlg HomeSID

Dgtl HomeSID

Prog. More?

Menu, 4, 0 Select Quick NAM Programming

654321 Envice Service Lock Code.

1 Choose ÒNAM1Ó

Phone Number Phone Number.

Mobile ID Number Mobile ID Number.

Number Analog System ID Number.

Number Digital System ID Number.

✻ or # Exit or Enter Long NAM

➞

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NAM Programming

LCD Display Key in Function

NAM Program 1:General 2:Setup NAM1

General ESN

B0000000

General CAIversion

General VOC select SO_VOICE_13K

General SCM

01101010

General Service code

654321

Lock Code

0000

Slot Mode

Yes

Slot Index

Pref NAM(1~4)... Digital pref

1 -choose ÔGENERAL.Õ

Volume ▲ Electronic Serial Number of the phone.

Volume ▲ The version of the Common Air Interface supported by the mobile.

✻ or # Vocoder data rate.

Volume ▲ Station Class Mark displays the power class (bit 0~1),

transmission (bit2), slotted (bit5), dual mode (bit6).

Number Six-digit number supplied by the user which enables service OK lock.

4-digit code Four-digit number supplied by the user which enables OK electronic locking of the phone.

✻ or # Enables slot mode.

Slot mode index.

0 - 7 Specifies the duration and frequency of times that the mobile OK checks the paging channel. The higher the value, the less often the

mobile looks at the paging channel, and the more power is saved.

Preferred system selection for NAM(1~4).

✻ or # Up to four NAMs are allowed for the phone. This lists one of the

OK four NAMs and allows you to program both the FM and CDMA

settings.

4-2 General Setup

➞

Samsung Electronics-Contents may change without notice. 4-3

NAM Programming

LCD Display Key in Function

NAM Program 1:General 2:Setup NAM1

NAM1 Digital IMSI_MCC

000

NAM1 Digital IMSI_MNC

NAM1 Digital phone #

3003003000

NAM1 Digital Mobile ID #

3003003000

NAM1 Digital Home SID #(1~4)

1700

NAM1 Digital Home NID #(1~4)

1700

NAM1 Digital Pchn Sys A

700

NAM1 Digital Pchn Sys B

700

NAM1 Digital Schn Sys A

700

NAM1 Digital Schn Sys B

700

NAM1 Digital Home SID Reg

Yes

2 -choose ÔSetup NAM1.Õ

Number International Mobile Station Identity Mobile Country Code.

Number International Mobile Station Identity Mobile Network Code.

Phone Number Phone number.

Mobile ID Number Mobile ID Number.

Number SID(1~4) written in the list, current status is displayed. OK to change, enter new one stores it.

Number NID(1~4) written in the list, current status is displayed. OK to change, enter new one stores it.

Channel Number Primary CDMA channel for the A carrier. OK Ranges from 0 to 1,023.

0 indicates no channel.

Channel Number Primary CDMA channel for the B carrier. OK Ranges from 0 to 1,023.

0 indicates no channel.

Channel Number Secondary CDMA channel for the A carrier. OK Suggested setting is 0:ranges form 0 to 1,023.

Channel Number Secondary CDMA channel for the B carrier. OK Suggested setting is 0:ranges form 0 to 1,023.

CDMA Home System ID.

✻ or # Enables the phone to allow mobile terminated calls while in

OK the home system. Controls the types of registration allowed

for the phone.

4-3 Setting up Long NAM1

➞

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NAM Programming

LCD Display Key in Function

NAM1 Digital Forn SID Reg

Yes

NAM1 Digital Forn NID Reg

Yes

NAM1 Digital Lockout SID1

NAM1 Digital ACCOLC

NAM1 Analog Phone # 3003003000

NAM1 Analog Home SID

4369

NAM1 Analog 1st Page Chn

333

NAM1 Analog Auto Reg

Yes

NAM1 Analog ACCOLC

CDMA foreign SID, current status is displayed.

✻ or # Changes the status.

OK Stores it.

CDMA foreign NID, current status is displayed.

✻ or # changes the system.

OK stores it.

CDMA Lock System ID.

ID Number Enable you to specify up to six SIDs that the phone will be OK prohibited from acquiring in CDMA mode. If all six SIDs are

set to zero, no lock restrictions will be in effect and the phone can acquire all SIDs. Default setting is 0:ranges from 0 to 32,767 up to six SIDs.

CDMA Access Overload Class.

Class Number This two-digit number specifies the level of priority assigned OK to the mobile for accessing the system.

Ranges from 0 to 15.

Phone Number Phone number.

FM Home System ID.

IDNumber The Identification of the cellular system in which the mobile OK station subscribes for service.

Cellular Service Provider.

1st Paging Channel.

Channel Number Suggested setting is 333 for the A carrier, 334 for the B carrier: OK ranges from 313 to 333 for A and 334 to 354 for B.

Primary analog paging channel: setting depends on whether the service is provided by the A carrier or the B carrier.

✻ or # Enables autonomous registration.

FM Access Overload Class.

✻ or # This two-digit number specifies the level of proirity assigned

OK to the mobile for accessing the system.

Ranges from 0 to 15.

➞

5. Circuit Description

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5-1 Logic Section

5-1-1 Power Supply

With the battery installed on the phone and by pressing the PWR key, the VBATT and ON_SW signals will be connected. This will turn on Q102 (2SC4081BR) and will drive DC-DC converter (U123) to output 5.0V. This in turn will be supplied to pin 6 of regulators (U121 and U122), thus releasing them from the shut-down state to output regulated 3.3V.

The VBATT applied to ON_SW will turn on Q103 (DTC144EE) resulting in the signal ON_SW_SENSE to change state from HIGH to LOW. This will allow MSM to send out PS_HOLD (logical HIGH) to turn on Q102 even after the PWR key is released.

The voltage (+3.3V) from U121 is used in the digital parts of MSM and BBA. The voltage (+3.3AV) from U122 is used in the analog part of BBA. The voltage from U124 (output of 5V) is used for the audio circuitry.

5-1-2 Logic Part

The Logic part consists of internal CPU of MSM, RAM, ROM and EEPROM. The MSM receives TCXO and CHIPX8 clock signals from the BBA and controls the phone during the CDMA and the FM mode. The major components are as follows: ¥ CPU : INTEL 80186 core ¥ FROM : U126 (MBM29LV800T) - 8MBIT

FLASH ROM

¥ SRAM : U127 (KM68V2000I) - 2MBIT

STATIC RAM

¥ EEPROM : U113 (AT24C128) - 128KBIT SER-

IAL EEPROM

CPU

INTEL 80186 CMOS type 16-bit microprocessor is used for the main processing. The CPU controls all the circuitry. For the CPU clock, 27MHz resonator is used.

FLASH ROM

One 8 MBIT FROM is used to store the terminalÕs program. Using the down-loading program, the program can be changed even after the terminal is fully assembled.

SRAM

One 2 MBIT SRAM is used to store the internal flag information, call processing data, and timer data.

EEPROM

One 128 KBIT EEPROM is used to store ESN, NAM, power level, volume level, and telephone number.

KEYPAD

For key recognition, key matrix is setup using SCAN0-6 of STORE signals and KEY0-3 of input ports of MSM. Eight LEDs and backlight circuitry are included in the keypad for easy operation in the dark.

LCD MODULE

LCD module contains a controller which will display the information onto the LCD by 8-bit data from the MSM. It also consists a DC-DC converter to supply -3.5V for fine view angle and LCD reflector to improve the display efficiency.

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Circuit Description

5-1-3 Baseband Part

MOBILE SYSTEM MODEM (MSM)

The MSM equipped with the INTEL 80186 CPU core is an important component of the CDMA cellular phone. The MSM comes in a 176 pins TQFP package. The interface block diagram is shown on page 6-3.

MICROPROCESSOR INTERFACE

The interface circuitry consists of reset circuit, address bus (A0-A19), data bus (AD0-AD15), and memory controls (ALE, DT_R, HWR/, LWR/, RAM_CS/, ROM_CS).

INPUT CLOCK

¦UCPU clock: 27 MHz ¦UTXCO/4 (pin 34): 4.92 MHz. This clock signal from the BBA is the reference clock for the MSM except in CDMA mode. ¦UCHIPX8 : 9.8304 MHz. The reference clock used during the CDMA mode.

BBA INTERFACE

CDMA, FM Data Interface

¥ TXIQDATA0-7 (pins 24-32) : TX data bus used

during both CDMA and FM mode.

¥ C_RX_IDATA0-3 (pins 16-20) and

C_RX_QDATA0-3 (pins 12-15) : RX data bus used during CDMA mode.

¥ FM_RX_IDATA (pin 7) and FM_RX_QDATA

(pin 8) : RX data bus used during FM mode.

Clock

¥ TX_CLK (pin 22), TX_CLK/(pin 23) : Analog to

Digital Converter (ADC) reference clock used in TX mode.

¥ CHIPX8 : ADC reference clock used in CDMA

RX mode.

¥ FMCLK : Reference clock in FM RX mode.

ADC Interface

ADC_CLK (pin 3), ADC_ENABLE (pin 1) and ADC_DATA (pin 2) are required to control the internal ADC in the BBA.

Data Port Interface

Includes the UART. Also, supports Diagnostic Monitor (DM) and HP equipment interface.

CODEC Interface

The MSM outputs 2.048 MHz PCM_CLK (pin 19) and 8 KHz CODEC_SYNC (pins 16,20) to the CODEC (U117). The voice PCM data from the MSM (U101) PCM_DIN (pin135) is compressed into 8KHz by QCELP algorithm in the CDMA mode. In FM mode, the data is processed by D_FM.

RF Interface

TX : TX_AGC_ADJ (pin 35) port is used to control the TX power level and PA_ON (pin 44) signal is used to control the power amplifier.

RX : AGC_REF (pin 36) port is used to control the RX gain and TRK_LO_ADJ (pin 45) is used to compensate the TCXO clock.

General Purpose I/O Register Pins

Input/output ports to control external devices.

Power Down Control

When the IDLE/ signal turns LOW, only the TX sections will be disabled. If both the IDLE/ and SLEEP/ changes to LOW, all the pins except for the TXCO is disabled.

Samsung Electronics-Contents may change without notice. 5-3

Circuit Description

ANTENNA

PA_ON

SYNTH_LOCK

TRK_LO_ADJ

TX_AGC_ADJ

RX_AGC_ADJ

RESIN/

XTAL

RESOUT LWR/ HWR/ RD/

DT_R/

PCS6/ RAM_CS/

ROM_CS/ EEPROM_CS/

AD0~AD15 A0~A19

PCM_CLK PCM_SYNC

PCM_DIN PCM_DOUT

DP_TX_DATA DP_RX_DATA

KEYSENSE0~4

RINGER

IDLE/

SLEEP/

FM/

C_RX_IDATA0~3

C_RX_QDATA0~3

CHIPX8

FM_RX_IDATA

FM_RX_QDATA

FM_RX_STB

ADC_ENABLE

ADC_DATA

ADC_CLK

FM_RX_CLK

TXCO/4

I_OFFSET, Q_OFFSET TXCLK, TXCLK/ TX_IQDATA0~7

CDMA MODE

FM MODE

RF UNIT

Q5312 CDMA BASEBAND ANALOG 2 (BBA2)

MODE CONTROL SUPPORT

GENERAL PURPOSE INTERFACE

CODEC

AMP

SPK

MIC

KEYPAD

VOCODER CORE

MSM 1. 0 CORE (CDMA PROCESSING)

DFM PROCESSING

GENERAL PURPOSE ADC SUPPORT

RF INTERFACE

MSM2300

80186 MICROPROCESSOR CORE

FIFOED SERIAL DATA PORT

EXTERNAL RAM, ROM, EEPROM, DISPLAY & OTHER PERIPHERALS

RINGER

Figure 6-1 Baseband Block Diagram

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Circuit Description

5-1-4 Audio Part

TX AUDIO PATH

The voice signal output from microphone is filtered and amplified by the internal OP-AMP and is converted to PCM data by the CODEC (U117). This signal is then applied to the MSM (U101)Õs internal vocoder.

RX AUDIO PATH

The PCM data out from the MSM is converted to audio signal by ADC of CODEC (U117), is then amplified by the speaker amplifier (U111) to be sent to the speaker unit.

FM TX PATH

Pre-Emphasis Circuit

The circuit features +6dB/oct to reduce signal loss and noise in Tx path.

Compressor

The compressor features 2:1 level to reduce signal loss and noise in Tx path. The zero crossing level of the compressor is ¡¾2.9 kHz/dev, attack time is 3 mS, and release time is 13.5 mS.

Limiter

The limiter performs to cut ¡¾0.53 Vp-p or higher audio signal level so that the FM frequency deviation is not over ¡¾12kHz/dev. The function is used to avoid confusion over phone line. LPF is used to reduce a specific high frequency of limited signal.

RX AUDIO PATH

De-Emphasis Circuit

This circuit is 1st LPF featuring -6dB/oct to reduce signal loss and noise in Rx path.

Expander

The expander features 1:2 level to reduce signal loss and noise in Rx path. The zero crossing level of the expander is ¡¾2.9 kHz/dev, attack time is 3 mS, and release time is 13.5 mS.

Volume Adjust

Volume can be adjusted up to 4 steps for the user to obtain a proper loudness of received signal.

5-1-5 TX WBD, ST, And SAT

These signals are generated from MSM. The modulation level of TX WBD and ST is ¡¾8kHz/dev, and SAT is ¡¾2kHz/dev.

5-1-6 Buzzer Driving Circuitry

Buzzer generates alert tone. When the buzzer receives the timer signal from the MSM, it generates alert tone. The buzzer level is adjusted by the alert signalÕs period generated from the MSM timer.

5-1-7 Key Tone Generator

Ringer signal (pin 49) out from MSM (U101) is passed through 2 serial LPF consisting of R141, C145, R145, and C142, amplified at the speaker amp (U111), and comes out to speaker. In handsfree mode, the key tone is applied to RX audio line through the LPF and C153, R142.

Samsung Electronics-Contents may change without notice. 5-5

Circuit Description

5-2 Receiver Section

LOW NOISE AMPLIFIER (LNA)

The low noise amplifier featuring 1.5dB and 16 dB gain amplifies a weak signal received from the base station to obtain the optimum signal level.

DOWN CONVERTER (MIXER)

First local signal is applied to this down converter. The down converter transfers the signal amplified at the LNA into 85.38 MHz IF signal. 85 MHz IF signal is made by subtracting 881 ¡¾12.5 MHz RF signal from 966 ¡¾12.5MHz first local signal.

RX IF AUTOMATIC GAIN CONTROLLER (AGC) AMP

85.38 MHz IF signal is applied to IF AGC amp, the

IF AGC output level is applied to BBA (Baseband Analog Asic). The IF AGC amp (U302) keep the signal at a constant level by controlling the gain. Dynamic range is 90 dB, up gain +45dB, and down gain -45dB.

RF BAND PASS FILTER (BPF)

The RF BPF (F302) accepts only a specific frequency (881 ¡¾12.5MHz) from the signal received from the mobile station. The band width is 25 MHz.

IF SAW BAND PASS FILTER FOR AMPS

IF SAW BPF (F304) is used for AMPS system having 30 kHz channel spacing and ¡¾15 kHz band width. The filter also eliminates the image product generated at the mixer.

IF SAW BAND PASS FILTER FOR CDMA

IF SAW BPF (F303) is used for CDMA system having 1.23 MHz wide band and ¡¾630 kHz band width. The filter also eliminates the image product generated at the mixer.

BUFFER

Buffer (Q342) amplifies signal to be applied to the local input of the down converter (U301) when a phase is locked between VCO (U341) and PLL IC (U342).

VOLTAGE CONTROLLED OSCILLATOR

The VCO (U341) generates the signal having 966 MHz center frequency and ¡¾12.5 MHz deviation with the voltage control. PLL IC (U342) controls this signal.

PHASE LOCKED LOOP (PLL)

Input reference frequency is generated at VC_TCXO (U343) and the divided signal is generated at VCO (U341). PLL compares the two signals and generates the desired signal with a pre-programmed counter which controls voltage.

VOLTAGE CONTROLLED TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR

It provides 19.68 MHz reference frequency to the mobile main set. A correct frequency tuning is made by the voltage control.

THERMISTOR

The thermistor (U371) detects temperature. It is used to compensate active component characteristics due to the temperature difference.

Samsung Electronics - Contents may change without notice.5-6

Circuit Description

5-3 Transmitter Section

BASEBAND ANALOG ASIC (BBA)

BBA (U401) consists of ADC, DAC, LPF (FM/CDMA), divider, VCO, logic control circuit, PLL, and mixer.

BBA performs a specific function between RF part and logic part, with MSM. The IF signal out from Rx IF AGC amp is secondly converted through the down-converter. The signal passes through the CDMA or FM filter, converts to digital signal through ADC, then is sent to MSM. The digital signal out from MSM converts to analog signal through DAC. The analog signal converts to the IF signal through each filter and the up-converter.

POWER AMP MODULE

Power Amp module (U467) amplifies signal (28 dB Gain) to be sent out to the base station through the antenna .

UP CONVERTER (MIXER)

The up-converter (U461) receives the first local signal to generate 836 ¡¾12.5 MHz from the signal controlled by TX IF AGC amp (U460). 836 ¡¾12.5 MHz signal comes out from the mixer output by subtracting 130 MHz IF signal from 966 ¡¾12.5 MHz first local signal. The driver amp and this up-converter are packaged into one in U461.

IF AUTOMATIC GAIN CONTROLLER AMP

The signal out to the base station should be a constant level. The TX IF AGC amp (U460) controls power to keep the signal at a constant level. Dynamic range is 85 dB, up gain +40dB, and down gain -45dB.

RF BAND PASS FILTER (BPF)

The RF BPF (F451) accepts only a specific frequency (836 ¡¾12.5MHz) to send it out to the base station. The band width is 25 MHz.

POWER SUPPLY SWITCHING

Power supply switching (Q483) turns on TX_POWER when the phone is in traffic mode and supplies power to the circuits.

ISOLATOR

Isolator (U468) is used to reduce a reflected signal to protect the power amp module from being damaged.

POWER SUPPLY REGULATOR

The power supply regulator (U482, U483) supply a regulated power to each part of transmitter. U483 supplies 4.7V to TX mixer (U461) and OP amp (U463). U482 supplies 3.6 V to TX IF AGC amp (U460).

DUPLEXER

Duplexer (F301) controls to transmit through the antenna only the signals within acceptable Tx frequency range (836 ¡¾12.5 MHz) and to receive through the antenna only the signals within acceptable Rx frequency range (881 ¡¾12.5 MHz). It also matches LNA (U301) input in receiving part and PA output in transmitter part with the antenna.

POWER SUPPLY REGULATOR

The power supply regulator (U381, U382) generates a regulated power (3.6VR).

ANTENNA

Antenna (ANT1) allows signals to send to receive from the base station.

Samsung Electronics-Contents may change without notice. 5-7

Circuit Description

5-4 Rapid Desk-Top Charger

Rapid Charger, DTC58 is composed of power supply part and control part.

5-4-1 Power Supply Part (Flyback type

SMPS circuit)

AC INPUT

AC input protection circuit and rectifier circuit

AC power through the AC plug is rectifiered to DC power of high voltage through the BD1 and C2. MOV1 is used by protection circuit from AC power surge. F1 is fuse to prevent over current. C1 and LF1 is EMI noise protection filter of switching power.

Switching controller and transformer

IC1 supplies constant voltage and constant current to secondary circuit through the transformer. D1, D2 absorbs the reverse voltage when transformer winding turns off.

SECONDARY POWER

Output constant voltage circuit : HIC, IC7, VR1

The HIC detects output voltage and compares it with reference voltage in HIC. The error is FED to primary circuit by IC7A. The feeback error is converted to current by IC7B and D3. The current controlls IC1.

Secondary rectifier circuit : D4, D5, C8, C11

The secondary AC output of transformor is rectified to DC voltage.

Secondary filter circuit : L1, L2, C9, C12

It minimizes the high frequency ripple noise, which is caused by primary oscilation.

Secondary DC/DC converter circuit : Q2, D8, L3, C19

It changes the DC output voltage to 8.4V through step-down chopper method.

Reverse current protection circuit : D6, D7

When power is off, it protects the reverse flow of current from battery pack.

5-4-2 Control Part

MICOM CONTROLLER : HIC

HIC is include u-COM to controlled whole charging system and include following internal circuit :

-General Input/Output port

-A/D converter

-Reset delay circuit (Power on delay)

-Timer

It is carried following functions :

-Battery Recognition

-Charging termination condition detection

-Output short detection and output protection

-Temperature detection

BATTERY RECOGNITION CIRCUIT : HIC

Battery identity detection determined to voltage detection battery internal between C/F and GND.

Samsung Electronics - Contents may change without notice.5-8

Circuit Description

5-5 Hands-Free Kit

5-5-1 Charging Circuit

A constant voltage is used for the hands-free kit. This circuit converts DC 12V input current to 8.4V DC to charge the battery. When the battery is fully charged, the charge current drops and the circuit operates as a constant voltage.

5-5-2 u-Processor

Micro processor controls charging power and charging current to protect the phone. It also allows to communicate with a HHP, and to convert from hands-free mode to private mode, and vice verse. It adjusts speaker volume at 8 steps and attenuates echo and noise occurred during conversation.

5-5-3 Speaker circuit

This circuit eliminates HHP noise, and controls the sound quality and speaker volume using analog C-mos IC which checks the speaker signal up to 8 steps. 5W audio amplifier amplifies the speaker signal.

5-5-4 Microphone Circuit

This circuit separates ground to eliminate the noise occurring from the HHP antenna and microphone. u-processor controls this circuit to attenuate echo which may occur in Land side.

CURRENT DETECTION CIRCUIT : R5, R6, R11, R12, HIC

Battery charging current is changed voltage through R5, R6, R11, R12. This voltage inputed u-COM to 16 times amplifiered through HIC.

VOLTAGE DETECTION CIRCUIT : HIC

u-COM A/D through HIC pin 12, 13 detected voltage.

BATTERY TEMPERATURE DETECTION CIRCUIT : HIC, TH1

Battery temperature detection determined temperature by ues of thermistor registor variation of THI by HIC.

CURRENT LIMIT CIRCUIT : HIC

When soft-change, current detection circuit limited current flow to battery, reference voltage more than detected current, detected current and HIC internal reference voltage.

Samsung Electronics-Contents may change without notice. 5-9

Circuit Description

5-6 Test Procedure

5-6-1 Configuration of Test

Spectrum Analyzer

RF In

Test Cable

HP8924C

RF In/Out Audio Out Audio In

Directional Coupler

Test Jig

To A-Out To A-In

DC Power Supply (+3.6 V)

Items needed to purchase from SAMSUNG.

Items Parts # Remark

RF Test Cable GH97-00687A

Test JIG GH80-10502A Including

(RF Interface Pack AssÕy) 1. Power Cable (Black, Red)

2. 9-pin RS232 Data Cable

DM Cable GH39-30515A

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