LG GM210 Service Manual

Service Manual Model : GM210

Internal Use Only

Service Manual

GM210

Date: April, 2009 / Issue 1.0

Table Of Contents

1. INTRODUCTION ...............................................5

1.1 Purpose ......................................................................5

1.2 Regulatory Information .................................................5

1.3 Abbreviations ..............................................................7

2. SYSTEM SPECIFICATION.................................9

2.1 H/W Features ..............................................................9

2.2 Technical Speciﬁ cation ...............................................11

3. TECHNICAL BRIEF .........................................16

3.1 Main Processor(Digital Part : AD6725, U102) ..............16

3.2 Main Processor (Analog Part : AD6725, U102) ............19

3.3 RF Transceiver (AD6546) ...........................................26

3.4 Power Ampliﬁ er Module (SKY77523) ..........................39

3.5 BT Module with integrated FM tuner ...........................30

3.6 MEMORY(PF38F5060M0Y0BE, U100 ) .......................32

3.7 Multi-Media Processor (AIT817, U602) .......................35

3.8 SIM Card Interface .....................................................38

3.9 Micro-SD Card Interface ............................................39

3.10 LCD Interface ..........................................................40

3.11 Battery Charger Interface .........................................43

3.12 Keypad Interface .....................................................44

3.13 Audio Interface ........................................................46

3.14 Camera Interface(2M Fixed Focus Camera) ...............53

3.15 KEY BACLKLIGHT LED Interface ................................55

3.16 Vibrator Interface .....................................................57

4. TROUBLE SHOOTING ..................................... 58

4.1 RF Component ..........................................................58

4.2 RX Trouble ................................................................59

4.3 TX Trouble .................................................................64

4.4 Power On Trouble ......................................................68

4.5 Charging Trouble .......................................................71

4.6 Vibrator Trouble .........................................................73

4.7 LCD Trouble ..............................................................75

4.8 Camera Trouble .........................................................79

4.9 Speaker Trouble ........................................................83

4.10 Earphone Trouble .....................................................85

4.11 Receiver Trouble ......................................................89

4.12 Microphone Trouble .................................................91

4.13 SIM Card Interface Trouble .......................................93

4.14 KEY backlight Trouble ..............................................95

4.15 RTC Trouble ............................................................97

4.16 Folder on/off Trouble ................................................99

4.17 Micro SD Trouble ...................................................101

4.18 FM radio Trouble ...................................................103

5. DOWNLOAD .................................................105

5.1 Download................................................................105

6. BLOCK DIAGRAM ........................................111

7. CIRCUIT DIAGRAM ...................................... 113

8. BGA Pin Map .............................................. 121

9. PCB LAYOUT ...............................................125

10. Conﬁ guration of HOT KIMCHI .................131

10.1 BB Test [MENU 1] ..................................................132

10.2 RF Test [MENU 2] ..................................................134

10.3 MF mode [MENU 3] ...............................................134

10.4 Trace option [MENU 4] ...........................................135

10.5 Call timer [MENU 5] ...............................................135

10.6 Fact. Reset [MENU 6] .............................................135

10.7 S/W version ..........................................................135

11. STAND ALONE TEST.................................. 136

11.1 Introduction ...........................................................136

11.2 Setting Method ......................................................136

11.3 Means of Test ........................................................137

12. RF Calibration .......................................... 139

12.1 Overview ...............................................................139

12.2 Procedure .............................................................139

12.3 AGC ......................................................................140

12.4 APC ......................................................................140

12.5 ADC ......................................................................140

13. EXPLODED VIEW & REPLACEMENT

PART LIST ................................................ 141

13.1 EXPLODED VIEW ...................................................141

13.2 Replacement Parts ................................................143

13.3 Accessory .............................................................166

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LGE Internal Use Only

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Only for training and service purposes

1. INTRODUCTION

1.1 Purpose

This manual provides the information necessary to repair, calibration, description and download the features of this model.

1.2 Regulatory Information

A. Security

Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example, persons other than your company’s employees, agents, subcontractors, or person working on your company’s behalf) can result in substantial additional charges for your telecommunications services. System users are responsible for the security of own system. There are may be risks of toll fraud associated with your telecommunications system. System users are responsible for programming and configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this product is immune from the above case but will prevent unauthorized use of common-carrier telecommunication service of facilities accessed through or connected to it.

The manufacturer will not be responsible for any charges that result from such unauthorized use.

B. Incidence of Harm

If a telephone company determines that the equipment provided to customer is faulty and possibly causing harm or interruption in service to the telephone network, it should disconnect telephone service until repair can be done. A telephone company may temporarily disconnect service as long as repair is not done.

C. Changes in Service

A local telephone company may make changes in its communications facilities or procedure. If these changes could reasonably be expected to affect the use of the this phone or compatibility with the network, the telephone company is required to give advanced written notice to the user, allowing the user to take appropriate steps to maintain telephone service.

D. Maintenance Limitations

Maintenance limitations on this model must be performed only by the manufacturer or its authorized agent. The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty.

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LGE Internal Use Only

1. INTRODUCTION

E. Notice of Radiated Emissions

This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory agencies. In accordance with these agencies, you may be required to provide information such as the following to the end user.

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different.

G. Interference and Attenuation

Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from unsuppressed engines or electric motors may cause problems.

H. Electrostatic Sensitive Devices

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated

by the sign. Following information is ESD handling:

• Service personnel should ground themselves by using a wrist strap when exchange system

boards.

• When repairs are made to a system board, they should spread the floor with anti-static mat

which is also grounded.

• Use a suitable, grounded soldering iron.

• Keep sensitive parts in these protective packages until these are used.

• When returning system boards or parts like EEPROM to the factory, use the protective

package as described.

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Only for training and service purposes

1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

Automatic Power ControlAPC

BasebandBB

Bit Error RatioBER

Constant Current – Constant VoltageCC-CV

Digital to Analog ConverterDAC

Digital Communication SystemDCS

dB relative to 1 milli wattdBm

1. INTRODUCTION

Digital Signal ProcessingDSP

Electrical Erasable Programmable Read-Only MemoryEEPROM

Electrostatic DischargeESD

Flexible Printed Circuit BoardFPCB

Gaussian Minimum Shift KeyingGMSK

General Purpose Interface BusGPIB

Global System for Mobile CommunicationsGSM

International Portable User IdentityIPUI

Intermediate FrequencyIF

Liquid Crystal DisplayLCD

Low Drop OutputLDO

Light Emitting DiodeLED

Offset Phase Locked LoopOPLL

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LGE Internal Use Only

1. INTRODUCTION

Power Amplifier ModulePAM

Printed Circuit BoardPCB

Programmable Gain AmplifierPGA

Phase Locked LoopPLL

Public Switched Telephone NetworkPSTN

Radio FrequencyRF

Receiving Loudness RatingRLR

Root Mean SquareRMS

Real Time ClockRTC

Surface Acoustic WaveSAW

Subscriber Identity ModuleSIM

Sending Loudness RatingSLR

Static Random Access MemorySRAM

Pseudo SRAMPSRAM

Side Tone Masking RatingSTMR

Travel AdapterTA

Time Division DuplexTDD

Time Division Multiple AccessTDMA

Universal Asynchronous Receiver/TransmitterUART

Voltage Controlled OscillatorVCO

Voltage Control Temperature Compensated Crystal OscillatorVCTCXO

WAP

Wireless Application Protocol

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Only for training and service purposes

2. SYSTEM SPECIFICATION

2.1 H/W Features

Item Feature Comment

Standard Battery Li-ion Polymer, 3.7V 800mAh

Stand by TIME Up to 200 hrs : Paging Period 5, RSSI 85dBm

Talk time Up to 200min : GSM Tx Level 7

Stand by time Up to 200 hours (Paging Period: 5, RSSI: -85 dBm)

Charging time Approx. 3 hours

2. SYSTEM SPECIFICATION

RX Sensitivity GSM, EGSM: -109dBm, DCS: -109dBm

TX output power

GPRS compatibility Class 12

EDGE compatibility Class 12

SIM card type 3V/1.8V Small

Display TFT 240 × 320 pixel 65K Color

KEYPAD

ANT Internal(GSM, Bluetooth)

EAR Phone Jack Yes

PC Synchronization Yes

Speech coding

Data and Fax Yes

Vibrator Yes

GSM, EGSM: 32.3dBm(Level 5), DCS , PCS: 29.5dBm(Level 0)

0 ~ 9, #, *, Up/Down/Left/Right Navigation Key Music Key, Clear Key, OK Key, PWR Key Send Key, Soft Key(Left/Right) Volume Key(Up/Down), Camera Key, Hold Key

EFR/FR/HR/AMR

3.5 Ø only

Loud Speaker Yes

Voice Recoding Yes

Microphone Yes

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LGE Internal Use Only

2. SYSTEM SPECIFICATION

Item Feature Comment

Speaker/Receiver Oval Type(1812), Speaker & Receiver Dual Mode

Travel Adapter Yes

MIDI SW MIDI (Mono SPK)

Camera 2M

Bluetooth / FM Radio Bluetooth version 2.1 / 76~108MHz supported

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Only for training and service purposes

2.2 Technical Specification

2. SYSTEM SPECIFICATION

Item Description

1 Frequency Band

2 Phase Error

3 Frequency Error

4 Power Level

Specification

GSM850

TX: 824 + n ´ 0.2 MHz (n=1 ~ 124)

RX: TX + 45 MHz

GSM900

TX: 890 + n ´ 0.2 MHz (n=1 ~ 124)

890 + (n-1024) ´ 0.2 MHz (n=975 ~ 1023)

RX: TX + 45 MHz

DCS1800

TX: 1710 + ( n-511 ) ´ 0.2 MHz (n = 512 ~ 885)

RX: TX + 95 MHz

PCS1900

TX: 1850 + ( n-511 ) ´ 0.2 MHz

RX: 1930 + ( n-511 ) ´ 0.2 MHz (n = 512 ~ 810)

RMS < 5 degrees

Peak < 20 degrees

< 0.1ppm

GSM850/GSM900

Level Power Toler. Level Power Toler.

5 33 dBm ±2dB 13 17 dBm ±3dB

6 31 dBm ±3dB 14 15 dBm ±3dB

7 29 dBm ±3dB 15 13 dBm ±3dB

8 27 dBm ±3dB 16 11 dBm ±5dB

9 25 dBm ±3dB 17 9 dBm ±5dB

10 23 dBm ±3dB 18 7 dBm ±5dB

11 21 dBm ±3dB 19 5 dBm ±5dB

12 19 dBm ±3dB

DCS1800/PCS1900

Level Power Toler. Level Power Toler.

0 30 dBm ±2dB 8 14 dBm ±3dB

1 28 dBm ±3dB 9 12 dBm ±4dB

2 26 dBm ±3dB 10 10 dBm ±4dB

3 24 dBm ±3dB 11 8 dBm ±4dB

4 22 dBm ±3dB 12 6 dBm ±4dB

5 20 dBm ±3dB 13 4 dBm ±4dB

6 18 dBm ±3dB 14 2 dBm ±5dB

7 16 dBm ±3dB 15 0 dBm ±5dB

- 11 -

LGE Internal Use Only

2. SYSTEM SPECIFICATION

Item Description Specification

GSM, EGSM

Offset from Carrier (kHz). Max. dBc

100 +0.5

200

250

400

600~ <1,200

1,200~ <1,800

1,800~ <3,000

3,000~ <6,000

Output RF Spectrum (due to modulation)

DCS/PCS

Offset from Carrier (kHz). Max. dBc

6,000 -71

100 +0.5

200

250

400

600~ <1,200

1,200~ <1,800

-30

-33

-60

-63

-65

-30

-33

-60

1,800~ <3,000

3,000~ <6,000

6,000 -73

GSM, EGSM

Output RF Spectrum

(due to switching

transient)

Offset from Carrier (kHz). Max. dBm

400

600

1,200 -21

1,800 -24

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Only for training and service purposes

-65

-19

-21

2. SYSTEM SPECIFICATION

Item Description Specification

DCS/PCS

Offset from Carrier (kHz). Max. dBm Output RF Spectrum (due to switching

transient)

7 Spurious Emissions Conduction, Emission Status

GSM, EGSM

8 Bit Error Ratio

BER (Class II) < 2.439% @-104 dBm

DCS, PCS

BER (Class II) < 2.439% @-104 dBm

400

600

1,200 -24

1,800 -27

-22

-24

9 RX Level Report Accuracy ±3 dB

10 SLR 8±3 dB

Frequency (Hz) Max.(dB) Min.(dB)

11 Sending Response

12 RLR 2±3 dB

100 -

200 -

300

1,000 -6

2,000 -6

3,000 -6

3,400 -9

4,000

-12

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LGE Internal Use Only

2. SYSTEM SPECIFICATION

Item Description Specification

Frequency (Hz) Max.(dB) Min.(dB)

100 -

-12

13 Receiving Response

* Mean that Adopt a straight line in between 300 Hz

and 1,000 Hz to be Max. level in the range.

14 STMR 13±5 dB

15 Stability Margin > 6 dB

dB to ARL (dB) Level Ratio (dB)

16 Distortion

200 -

300

500

1,000 -5

3,000 -5

3,400 -10

4,000

-35

-30

-20

-10

17.5

22.5

30.7

33.3

-7

-5

17 Side Tone Distortion Three stage distortion < 10%

19 32.768KHz tolerance ≤ 30 ppm

20 Ringer Volume

System frequency (13 MHz) tolerance

≤ 2.5 ppm

At least 65 dBspl under below conditions:

1. Ringer set as ringer.

2. Test distance set as 50 cm

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Only for training and service purposes

33.7

31.7

25.5

2. SYSTEM SPECIFICATION

Item Description Specification

Fast Charge : Typ. 390 mA

21 Charge Current

Slow Charge : Typ. 80mA

Total Charging Time : < 3 hours

Bar Number Power

22 Antenna Display

23 Battery Indicator

Low Voltage Warning

( Blinking Bar)

7 -> 5

5 -> 4

4 -> 2

2 -> 1

1 -> 0 -106 ± 2

0 -> OFF

Battery Bar Number Voltage

3 -> 2

2 -> 1

1 -> 0

≤ 3.54 ± 0.05V (Call), 1/1-minute(Receiver)

≤ 3.4 ± 0.05V (Standby), 1/3-minute(Speaker)

-93 ~

-93 ± 2

-98 ± 2

-101 ± 2

-104 ± 2

~ -106

≥ 3.75± 0.05 V

3.75 ± 0.05 V

3.64 ± 0.05 V

3.54 ± 0.05 V

27 Battery Type

28 Travel Charger

Forced shut down

Voltage

Sustain RTC

without battery

3.33 ± 0.05V

Over 50 hours

Li-Polymer Battery Standard Voltage = 3.7 V Battery full charge voltage = 4.2 V Capacity: 800mAh

Switching-mode charger Input: 100 ~ 350V, 50/60 Hz Output: 5.6 V, 400 mA

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.1 Main Processor(Digital Part : AD6725, U102)

Figure. 3-1-1 AD6725 FUNCTIONAL BLOCK DIAGRAM

The AD6725 is a tightly integrated single-package baseband processing solution offered by Analog Devices as part of the AD20msp520 SoftFone® chipset family. The AD6725 incorporates all digital, analog, and power management functions required in GSM, GPRS, EGPRS handsets with advanced multimedia and system power management capabilities.

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Only for training and service purposes

3. TECHNICAL BRIEF

3.1.1 Features of AD6725

Complete Single-Chip Programmable Baseband Processor divided into several subsystems

MCU Control Processor Subsystem:

▪ 32-bit ARM926EJ-S® MCU Control Processor ▪ 208 MHz operation at 1.2V ▪ 2 dedicated caches, 16kB each, for instructions and data ▪ 4kB Instruction Tightly Coupled Memory (TCM) ▪ 2-Mbit On-chip System SRAM ▪ Ciphering coprocessor for GPRS supporting GEA1 and GEA2 encryption algorithms ▪ Kasumi cipher coprocessor for GEA3 encryption ▪ Dedicated multichannel DMA controller

DSP Subsystem:

▪ 16-bit fixed-point Blackfin® DSP Processor ▪ 208 MHz operation at 1. ▪ Memory:

→ L1 program space: 64 kB SRAM and 16 kB configurable as instruction cache

or SRAM

→ L1 data space: Two banks of 16K bytes, each with 8K bytes of dedicated SRAM

and an additional 8K bytes that can be configured as either cache or SRAM

→ L2 space: 64KB SRAM ▪ Ciphering coprocessor (GEA1 and GEA2) ▪ Kasumi cipher coprocessor for GEA3 encryption ▪ Dedicated multichannel DMA controller

Peripherals Subsystem:

▪ Shared on-chip peripherals and off-chip interfaces: ▪ Support for Burst-mode, Page-mode, and NAND Flash memory ▪ Support for SRAM, SDRAM, and PSRAM (cellular RAM) ▪ Full-Speed USB 2.0 Dual-Role Interface with OTG (On-The-Go) Host Mode or

traditional Peripheral-only mode

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LGE Internal Use Only

3. TECHNICAL BRIEF

▪ Serial Display Interface ▪ 8x8 Keypad Interface ▪ Thumbwheel Interface ▪ 4 Independent Programmable Backlights plus a Service Light ▪ 1.8V and 3.0V, 64 kbps SIM Interface ▪ Universal System Connector Interface ▪ Multimedia Card (MMC) Interface ▪ Secure Data (SD) Card Interface and SD I/O ▪ IrDA transceiver interfaces, including Fast IrDA (4 Mbps baud) ▪ 2 Configurable Generic Serial Ports (GSPs) ▪ 7 Configurable Enhanced Generic Serial Ports (eGSPs)

Applications Subsystem for Enhanced Multimedia:

▪ Dedicated 8/16/18-bit interface for parallel displays ▪ 8/10-bit Parallel Peripheral Interface (PPI) for camera sensor ▪ Image Signal Processing (ISP) module supporting resolutions up to 3.14 mega pixels. ▪ Flexible 2-D DMA controller ▪ Camera Flash synchronization strobe ▪ Hardware image scaling ▪ YCbCr/RGB color conversion ▪ JPEG decoder hardware Hardware ▪ JPEG compression

OTHER FEATURES

▪ Real-Time Clock (RTC) with Alarm ▪ Four General-Purpose Timers ▪ Compatible with Othello® radio subsystem ▪ Configurable interrupt controller architecture ▪ Programmable bus arbitration to optimize system performance ▪ Programmable Power Management and Clock Management

 Slow Clocking Scheme for Low Idle Mode Current  Power Down modes  Dynamic Core Voltage Scaling

 Active Leakage Current Management ▪ Independent I/O Voltage Domains ▪ On-chip support for EGPRS Data Services up to Class 12 ▪ JTAG Interface for Test and In-Circuit Emulation of both the MCU and DSP ▪ Embedded Trace Macrocell for MCU Debug ▪ Advanced features for security Real-Time Clock (RTC) with Alarm

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Only for training and service purposes

3.2 Main Processor (Analog Part : AD6725, U102)

3. TECHNICAL BRIEF

AUDIO Subsystem

Radio Interface

Figure. 3-2-1 AD6725 FUNCTIONAL BLOCK DIAGRAM

The AD6725 is a complete mixed-signal baseband processor that combines all of the data converters and power supply regulators required for a GSM 900 / GSM 850 / DCS 1800 / PCS 1900 mobile on a single device, including HSCSD, GPRS and EGPRS.

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.2.1 General Description

The AD6725 baseband transmit section supports the following mobile station GMSK modulation power classes:

• GSM 900/850 power classes 4 and 5,

• DCS 1800 power classes 1 and 2, and

• PCS 1900 power classes 1 and 2.

The AD6725 baseband transmit section supports the following mobile station 8-PSK modulation power classes:

• GSM 900/850 power classes E2 and E3,

• DCS 1800 power classes E2 and E3, and

• PCS 1900 power classes E2 and E3.

The AD6725 baseband receive section supports GMSK and 8-PSK applications. The AD6725 auxiliary section provides a voltage reference, an automatic frequency control DAC, an auxiliary ADC, and light controllers. The auxiliary ADC provides two channels for measuring temperature using discrete external devices placed in critical locations. The AD6725 audio section provides 8 kHz and 16 kHz sampling rates for voiceband data input and output and provides nine standard sample rates ranging from 8kHz to 48 kHz for personal audio output on two PCM Audio serial ports. The two Audio serial ports allow support for concurrency. The AD6725 power management section provides voltage regulators for digital and analog components, a battery charger, battery protection circuitry, and power supply activation logic. The AD6725 digital processor interface provides serial ports for control data, baseband transmit and receive data, and two for audio data.

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Only for training and service purposes

3. TECHNICAL BRIEF

3.2.2 Power Block

CSPORT interface, power management control interface and the circuit that generates power up RESET pulses(RESET1P8) for use by the DBB chip. All regulators except the USB interface regulator are powered from the main battery. The USB regulator is powered from USB VBUS. And the user presses KEYON which puts the AD6725 power management system into ACTIVATION state (see definitions below) and signals DBB software that it’s time to wake up and operate using the KEYOUT signal.

Figure. 3-2-2 AD6725 POWER BLOCK DIAGRAM

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LGE Internal Use Only

3. TECHNICAL BRIEF

Figure. 3-2-3 AD6725 KEYON/KEYOUT BLOCK DIAGRAM

Figure. 3-2-4 AD6725 RESET GENERATION BLOCK DIAGRAM

- 22 -

Only for training and service purposes

3. TECHNICAL BRIEF

Power On Reset Generator

The power-on reset signals (RESET1P8 and RESET2P8) are asserted based on the VCORE (if VAPPCFG = 0), VMEM, VEXT, and VPLL regulators. RESET1P8 and RESET2P8 are low when reset is enabled and high when reset is disabled. When the outputs of all four regulators reach their corresponding threshold voltages, reset will be disabled after a nominal reset period of 130ms. The outputs of all four regulators must remain at or above their corresponding threshold voltages for the duration of the reset period for reset to be disabled (pulled high). The nominal 130ms reset period is restarted whenever all four regulators reach their threshold voltages. The nominal reset period of 130ms can be extended by connecting an external capacitor to CRST. This capacitor is charged using a small current when reset is enabled. Once the capacitor reaches the threshold, reset is disabled. Reset will be enabled immediately if any one of the four regulators falls below their corresponding threshold voltages. In addition, reset will be enabled if VBAT falls below VRTC. The PWREN signal is the logical AND of all the state controls that enable or disable many of the regulators on the chip. If the regulators enabled by PWREN are disabled by PMT state controls described below then PWREN must go low. When PWREN goes low reset will be immediately enabled causing RESET1P8 and RESET2P8 to be pulled low. When reset is enabled, both RESET1P8 and RESET2P8 are actively pulled low. CRST is also actively pulled low when reset is enabled.

VABB Regulator Enable/Disable Logic Operation

The VABB regulator powers many on-chip analog circuits on the ABB. The VCXOEN signal, the VABBEn bit in the LDOControl1 Bit Positions ( Addr 0x35) register, and the AFCDACMode and AFCDACOn bits in the AuxControl1 Bit Positions ( Addr 0x13) register all particpate in controlling the VABB enable/disable. When the ABB power management system transitions from Off state, DDLO state, UVLO state, or Thermal Shutdown State to Power Key Activation, Charger Activation, USB Charger Activation, or Active State VABB will be enabled. During these state transitions ABBEn = 0 and AFCDACMode = 0, VRF is enabled. Once the ABB power management system is in Power Key Activation, Charger Activation, USB Charger Activation, Active-Standby or Active State the VABB regulator enable/disable is controlled by the information written to the VABBEn and AFCDACMode register bits by system software.

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LGE Internal Use Only

3. TECHNICAL BRIEF

Digital Baseband Core (VCORE)

The Digital Baseband Core regulator supplies the digital baseband processor (DBB) core. The voltage on VCORE is selectable using the VCOREControl register. The VCOREActive code selects the voltage on VCORE in high power mode and the VCOREStandby code selects the voltage on VCORE in low-power mode.

DBB Interface (VINT)

The DBB interface regulator supplies the DBB/ABB digital interfaces. The output voltage of the VINT regulator is nominal 1.8V.

Memory (VMEM)

The VMEM regulator supplies the external memory(s) and the interface to the external memory on the digital baseband processor. The output voltage of the Memory Interface regulator can be selected as 1.8V nominal or 2.8V nominal using the VMEMSEL terminal.

External Interface (VEXT)

The External Interface regulator supplies the Radio digital interface and the high voltage (>1.8V) interface between the digital baseband processor and various peripherals, such as the LED indicators and the LCD display.

SIM Interface (VSIM)

AD6725 is designed to support 3.0 V and 1.8 V SIMs exclusively (i.e. no 5 V SIMs). The SIM Interface regulator supplies the SIM interface circuitry on the digital processor and the SIM card. By default the SIM Interface regulator output is 2.85 V, which can be decreased to 1.8 V if a 1.8 V SIM is detected.

Real-Time Clock (VRTC)

The Real-Time Clock regulator supplies the Real-Time Clock module. The Real-Time Clock regulator is optimized for low ground current.

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Only for training and service purposes

3. TECHNICAL BRIEF

Baseband Analog (VABB)

The Baseband Analog regulator supplies the analog portions of the AD6725. Operation of the VABB regulator is controlled by the VABBEn bit in the LDOControl1 register. If VABBEn = 0, the VABB regultor will be disabled unless the AFCDAC is enabled or VCXOEN = 1. If VABBEn = 1 (the default state) VABB is enabled along with VCORE, VMEM, and VEXT. The Baseband Analog regulator is optimized for high ripple rejection and low noise. The output of the Baseband Analog regulator should not be used as a supply for any external components.

Microphone (VMIC)

The Microphone regulator supplies the microphone interface circuitry. The Microphone regulator is optimized for extremely high ripple rejection up to 217 Hz and low noise.

VRF (VRF)

The VCXO regulator supplies the voltage controlled crystal oscillator (VCXO). The VCXO regulator is optimized for high ripple rejection and low noise.

USB Interface (VUSB)

The VUSB regulator supplies the USB transceiver located in the DBB. Digital Baseband PLL (VPLL) The VPLL regulator supplies the phase locked loop on the digital baseband (DBB).

General Purpose Regulator (VGP)

The General Purpose regulator is intended primarily to serve as a supply rail for camera modules. Its voltage is programmable by setting VGPSel[3:0] in theLDOControl2 Register. VGP is enabled by setting the VGPEn bit in LDOControl1 to 1.

Applications Regulator (VAPP)

The VAPP regulator is an adjustable regulator that uses an off chip pass device. It has two modes of operation selected by the state of the VAPPCFG terminal. If VAPPCFG is pulled low the VAPP regulator functions as a programmable voltage applications supply. In this mode, VAPP is enabled or disabled using the VAPPEn bit of LDOControl1.

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.3 RF Transceiver (AD6546)

3.3.1 Internal Block Diagram

Figure 3-3-1 AD6546 FUNCTIONAL BLOCK DIAGRAM

3.3.2 General Description

The AD6546 is a fully integrated Quad band GSM Transceiver with an advanced modulator design that fully supports 8-PSK EDGE modulation format.

The AD6546 contains a translation loop modulator for directly modulating baseband signals onto an integrated Tx VCO. The translation loop modulator and Tx VCO are extremely low noise removing the need for external TX filtering.

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Only for training and service purposes

3.3.2.1 Receiver

3. TECHNICAL BRIEF

Figure 3-3-2 AD6546 RECEIVER

Low Noise Amplifiers

The LNAs have differential inputs which help minimize the effect of unwanted interferers. The voltage gain of the LNAs is typically 24 dB. Each LNA can be switch to a low gain mode when receiving large input signals as part of the AGC system.

Down-Converting Mixers

Two quadrature mixers are used to mix down the signals from the LNAs, one for the high bands (1800 and 1900 MHz) and one for the low bands (850 and 900 MHz). The outputs of the mixers are connected to the baseband section through an integrated single pole filter with nominal cut-off frequency of 800kHz.

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.3.2.2 Transmitter

Figure 3-3-3 AD6546 TRANSMITTER

Transmitter Overview

The highly integrated transmit section of the AD6546 radio has been designed to fully support 8 PSK modulation for EDGE applications, and GMSK modulation for GSM. A translational loop is used for phase modulation, and for 8 PSK additional envelope (AM) circuits are enabled to implement a Polar modulator.

Quadrature Modulator

The Quadrature modulator takes the baseband I/Q signals and converts this onto a complex modulated signal (containing both amplitude and phase information) at the TX IF frequency. After bandpass filtering the TX IF signal is used as the reference input to the Phase Frequency Detector (PFD) for the transmit PLL, and in EDGE mode also provides the input to the Reference Path Log Detector circuit for AM restoration.

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Only for training and service purposes

3.4 Power Amplifier Module (SKY77523)

3.4.1 Internal Block Diagram

3. TECHNICAL BRIEF

Figure 3-4-1 SKY77523 FUNCTIONAL BLOCK DIAGRAM

3.4.2 General Description

The SKY77523 provides a complete transmit Voltage-Controlled Oscillator (VCO)-to-antenna and antenna-to-receive Surface Acoustic Wave (SAW) filter solution.

The module consists of a single GSM850/EGSM900 and DCS1800/PCS1900 PA block, a PA Control (PAC) block, impedance-matching circuitry for 50 Ω inputs and outputs, transmit harmonic filtering, an integrated coupler, high-linearity and low insertion-loss PHEMT RF switches, and a diplexer. A custom CMOS integrated circuit provides the internal PAC function, interface circuitry, and decoder circuitry to control the RF switches.

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.5 BT Module with integrated FM tuner

3.5.1 General Description

The BlueCore 5-FM BGA is a single-chip radio and baseband IC for Bluetooth 2.4GHz systems including enhanced data rates (EDR) to 3Mbits/s. It includes anintegrated FM receiver with stereo audio output stage and an RDS demodulator. With the on-chip CSR Bluetooth software stack, it provides a fully compliant Bluetooth system to v2.1 +EDR of the specification for data and voice communications.

3.5.2 Total internal Block Diagram

Figure 3-5-1 Total Internal Block Diagram

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Only for training and service purposes

3.5.3 BT radio internal Block Diagram

3. TECHNICAL BRIEF

Figure 3-5-2 BT radio internal Block Diagram

3.5.4 FM radio internal Block Diagram

Figure 3-5-3 FM Radio internal Block Diagram

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LGE Internal Use Only

+ 135 hidden pages

LG GM210 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual