LG KF300 Service Manual

Service Manual

KF300

Model : KF300

Date: February, 2008 / Issue 1.0

- 3 -

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 Specification ......................... 10

3. TECHNICAL BRIEF ....................... 15

3.1 Digital Main Processor(AD6900, U101). 15

3.2 Analog Main Processor(AD6855, U100) 18

3.3 Power Amplifier Module(SKY77318, U601)

.............................................................. 25

3.4 FEM (DGM1110M014, FL601) ............. 26

3.5 RTC(FC-135, X100).............................. 27

3.6 Crystal(26 MHz, X601).......................... 28

3.7 RF Tranceiver(AD6548, U602) ..............30

3.8 MEMORY(PF38F5060M0Y0BE, U202)..36

3.9 BT Module with integrated FM tuner

(EWFMLBAXX, U201) ...........................39

3.10 SIM Card Interface...............................41

3.11 Micro-SD Card Interface ......................42

3.12 LCD Interface.......................................43

3.13 Battery Charger Interface.....................46

3.14 Keypad Interface..................................47

3.15 Audio Interface.....................................49

3.16 Camera Interface

(2M Fixed Focus Camera) ...................56

3.17 KEY BACLKLIGHT LED Interface .......59

3.18 Vibrator Interface .................................60

4. TROUBLE SHOOTING ...................61

4.1 RF Component.......................................61

4.2 RX Trouble.............................................62

4.3 TX Trouble .............................................67

4.4 Power On Trouble..................................73

4.5 Charging Trouble ...................................75

4.6 Vibrator Trouble .....................................77

4.7 LCD Trouble...........................................79

4.8 Camera Trouble .....................................83

4.9 Speaker Trouble ....................................87

4.10 Earphone Trouble ................................89

4.11 Receiver Trouble..................................91

4.12 Microphone Trouble .............................93

4.13 SIM Card Interface Trouble..................95

4.14 KEY backlight Trouble .........................97

4.15 RTC Trouble ........................................99

4.16 Folder on/off Trouble..........................101

4.17 Micro SD Trouble ...............................103

4.18 Bluetooth Trouble...............................105

4.19 FM Radio Trouble ..............................107

5. DOWNLOAD.....................................109

5.1 Download .............................................109

6. BLOCK DIAGRAM ........................116

7. CIRCUIT DIAGRAM ......................117

8. BGA IC Pin Check ........................127

9. PCB LAYOUT................................133

10. ENGINEERING MODE ................139

10.1 BB Test [MENU 1]..............................140

10.2 RF Test [MENU 2]..............................142

10.3 MF mode [MENU 3] ...........................142

10.4 Trace option [MENU 4] ......................143

10.5 Call timer [MENU 5] ...........................143

10.6 Fact. Reset [MENU 6] ........................143

10.7 S/W version........................................143

11. STAND ALONE TEST .................144

11.1 Introduction ........................................144

11.2 Setting Method...................................144

11.3 Means of Test ....................................145

12. AUTO CALIBRATION .................147

12.1 Overview ............................................147

12.2 Equipment List ...................................147

12.3 Test Jig Operation..............................148

12.4 Procedure ..........................................149

12.5 AGC ...................................................151

12.6 APC....................................................151

12.7 ADC ...................................................151

13. EXPLODED VIEW &

REPLACEMENT PART LIST ..... 153

13.1 Exploded View .................................. 153

13.2 Replacement Parts ............................155

13.3 Accessory ......................................... 168

Table Of Contents

LGE Internal Use Only

- 4 -

LGE Internal Use Only

Only for training and service purposes

- 5 -

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.

1. INTRODUCTION

LGE Internal Use Only

- 6 -

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 matb 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.

LGE Internal Use Only

Only for training and service purposes

- 7 -

1. INTRODUCTION

1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

LGE Internal Use Only

APC Automatic Power Control

BB Baseband

BER Bit Error Ratio

CC-CV Constant Current - Constant Voltage

DAC Digital to Analog Converter

DCS Digital Communication System

dBm dB relative to 1 milli watt

DSP Digital Signal Processing

EEPROM Electrical Erasable Programmable Read-Only Memory

ESD Electrostatic Discharge

FPCB Flexible Printed Circuit Board

GMSK Gaussian Minimum Shift Keying

GPIB General Purpose Interface Bus

GSM Global System for Mobile Communications

IPUI International Portable User Identity

IF Intermediate Frequency

LCD Liquid Crystal Display

LDO Low Drop Output

LED Light Emitting Diode

OPLL Offset Phase Locked Loop

- 8 -

1. INTRODUCTION

LGE Internal Use Only

Only for training and service purposes

PAM Power Amplifier Module

PCB Printed Circuit Board

PGA Programmable Gain Amplifier

PLL Phase Locked Loop

PSTN Public Switched Telephone Network

RF Radio Frequency

RLR Receiving Loudness Rating

RMS Root Mean Square

RTC Real Time Clock

SAW Surface Acoustic Wave

SIM Subscriber Identity Module

SLR Sending Loudness Rating

SRAM Static Random Access Memory

PSRAM Pseudo SRAM

STMR Side Tone Masking Rating

TA Travel Adapter

TDD Time Division Duplex

TDMA Time Division Multiple Access

UART Universal Asynchronous Receiver/Transmitter

VCO Voltage Controlled Oscillator

VCTCXO Voltage Control Temperature Compensated Crystal Oscillator

WAP Wireless Application Protocol

- 9 -

2. SYSTEM SPECIFICATION

2.1 H/W Features

2. SYSTEM SPECIFICATION

LGE Internal Use Only

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

RX Sensitivity GSM850/EGSM: -109dBm, DCS/PCS: -109dBm

TX output power

GSM850, EGSM: 32.4dBm(Level 5), DCS , PCS: 29.5dBm(Level 0)

GPRS compatibility Class 10

SIM card type 3V Small

Display

MAIN : TFT 240 × 320 pixel 262K Color

SUB : TFT 128 × 160 pixel 262K Color

Hard icons. Key Pad

Status Indicator

0 ~ 9, #, *, Up/Down/Left/Right/Ok Navigation Key Menu Key, Clear Key, Back Key, Confirm Key Send Key, Volume Key, PWR Key, Camera Key, Hot Key

ANT Internal

EAR Phone Jack Yes

PC Synchronization Yes

Speech coding EFR/FR/HR

Data and Fax Yes

Vibrator Yes

Loud Speaker Yes

Voice Recoding Yes

Microphone Yes

Speaker/Receiver 16Ø Speaker / 11x07 Receiver

Travel Adapter Yes

MIDI SW MIDI (Mono SPK)

Camera 2M

Bluetooth / FM Radio Bluetooth version 2.0 / 76~108MHz supported

- 10 -

2. SYSTEM SPECIFICATION

2.2 Technical Specification

LGE Internal Use Only

Only for training and service purposes

Item Description Specification

GSM850

TX: 824 ~ 849MHz RX: 869 ~ 894MHz

EGSM

TX: 880 ~ 915MHz RX: 925 ~ 960MHz

DCS1800

1Frequency Band TX: 1710 ~ 1785MHz

RX: 1805 ~ 1880MHz

PCS1900

TX: 1850 ~ 1910MHz RX: 1930 ~ 1990MHz

2 Phase Error

RMS < 5 degrees Peak < 20 degrees

3 Frequency Error < 0.1 ppm

GSM850/EGSM

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

4 Power Level 12 19 dBm 3dB

DCS/PCS

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 -

2. SYSTEM SPECIFICATION

LGE Internal Use Only

Item Description Specification

GSM850/EGSM

Offset from Carrier (kHz). Max. [dBc]

100 0.5

200 -30

250 -33

400 -60

600 ~ 1,200 -60

1,200 ~ 1,800 -60

1,800 ~ 3,000 -63

3,000 ~ 6,000 -65

5

Output RF Spectrum 6,000 -71

(due to modulation) DCS/PCS

Offset from Carrier (kHz). Max. [dBc]

100 0.5

200 -30

250 -33

400 -60

600 ~ 1,200 -60

1,200 ~ 1,800 -60

1,800 ~ 3,000 -65

3,000 ~ 6,000 -65

6,000 -73

GSM850/EGSM

Offset from Carrier (kHz) Max. [dBm]

Output RF Spectrum 400 -19

6

(due to switching transient) 600 -21

1,200 -21

1,800 -24

- 12 -

2. SYSTEM SPECIFICATION

LGE Internal Use Only

Only for training and service purposes

Item Description Specification

DCS/PCS

Offset from Carrier (kHz) Max. [dBm]

Output RF Spectrum 400 -22

6

(due to switching transient) 600 -24

1,200 -24

1,800 -27

7 Spurious Emissions Conduction, Emission Status

GSM850/EGSM

8Bit Error Ratio

BER (Class II) < 2.439% @-102 dBm

DCS/PCS

BER (Class II) < 2.439% @-100 dBm

9 RX Level Report Accuracy

10 SLR 8 3 dB

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

100 -12 -

200 0 -

300 0 -12

11 Sending Response 1,000 0 -6

2,000 4 -6

3,000 4 -6

3,400 4 -9

4,000 0 -

12 RLR 2 3 dB

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

100 -12 -

200 0 -

300 0 -12

13 Receiving Response

1,000 0 -6

3,000 4 -6

3,400 4 -6

4,000 4 -9

*Mean that Adopt a straight line in between 300 Hz

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

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2. SYSTEM SPECIFICATION

LGE Internal Use Only

Item Description Specification

14 STMR 13 5 dB

15 Stability Margin > 6 dB

dB to ARL (dB) Level Ratio (dB)

-35 17.5

-30 22.5

16 Distortion

-20 30.7

-10 33.3

0 33.7

7 31.7

10 25.5

17 Side Tone Distortion Three stage distortion < 10%

18

System frequency

≤2.5 ppm

(13 MHz) tolerance

19 32.768KHz tolerance ≤ 30 ppm

At least 65 dBspl under below conditions:

20 Ringer Volume 1. Ringer set as ringer.

2. Test distance set as 50 cm

Fast Charge : Typ. 430 mA

21 Charge Current Slow Charge : Typ. 80mA

Total Charging Time : < 3 hours

Bar Number Power

7 -93~

7 → 5 -93 2

22 Antenna Display 5 → 4 -98 2

4 → 2-101 2

2 → 1-104 2

1 → 0-106 2

0 → OFF ~-106

Battery Bar Number Voltage

3≤3.75 0.05 V

23 Battery Indicator 3 → 2 3.75 0.05 V

2 → 1 3.64 0.05 V

1 → 0 3.54 0.05 V

Item Description Specification

24

Low Voltage Warning ≤ 3.54 0.05V (Call)

(Blinking Bar) ≤ 3.4 0.05V (Standby)

25

Forced shut down

3.33 0.05V

Voltage

26 Sustain RTCwithout battery Over 50 hours

Li-Ion Battery

27 Battery Type

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

Switching-mode charger

28 Travel Charger Input: 100 ~ 350V, 50/60 Hz

Output: 5.1 V, 700 mA

- 14 -

2. SYSTEM SPECIFICATION

LGE Internal Use Only

Only for training and service purposes

- 15 -

3. TECHNICAL BRIEF

LGE Internal Use Only

3.1 Digital Main Processor(AD6900, U101)

The AD6900 is an advanced, low-power baseband processing solution from Analog Devices, and is part of the AD20msp500 SoftFone® chipset family. The AD6900 is intended for use in a wide variety of feature-rich phones with GSM/GPRS/EGPRS based system connectivity requirements. It is designed to interface easily to an application/OS processor, or to stand alone as a fully integrated and easy-touse solution for mobile handset and wireless modem applications.

Figure. 3-1 AD6900 FUNCTIONAL BLOCK DIAGRAM

- 16 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

3.1.1 Features of AD6900

Complete Single-Chip Programmable Digital Baseband Processor with four main subsystems

MCU Control Processor Subsystem:

32-bit ARM926EJ-S® MCU Control Processor 260 MHz operation at 1.5V dedicated caches, 16K bytes 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:

Blackfin 16-bit fixed-point DSP Processor 260 MHz operation at 1.5V 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 Peripheralonly mode

- 17 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Applications Subsystem for Enhanced Multimedia:

Parallel Peripheral Interface (PPI) for 10-bit dedicated camera

sensor or video input interface (including ITU-656 and ITU-601 digital video)

Separate external bus interface for parallel LCD displays (or camera module inputs)

- reduces noise and loading on the

main EBUS interface

Dedicated multi-channel DMA controller

OTHER FEATURES

Real-Time Clock (RTC) with Alarm

Four General-Purpose Timers

Baseband Converter Interface

Compatible with Othello® radio subsystem

Highly configurable interrupt controller architecture

Programmable bus arbitration to optimize system performance

Supports 13 MHz and 26 MHz Input Clocks

Programmable Power Management and Clock Management

- Slow Clocking Scheme for Low Idle Mode Current

- Power Down modes

- Dynamic Core Voltage Scaling from 1.1 - 1.5V Independent I/O Voltage Domains On-chip support for EGPRS Data Services up to Class 10 Embedded Trace Macrocell for MCU Debug JTAG Interface for Test and In-Circuit Emulation of both the MCU and DSP Advanced features for security

LGE Internal Use Only

Only for training and service purposes

3. TECHNICAL BRIEF

- 18 -

3.2 Analog Main Processor(AD6855, U100)

The AD6855 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.

Figure. 3-2-1 AD6855 FUNCTIONAL BLOCK DIAGRAM

- 19 -

3. TECHNICAL BRIEF

LGE Internal Use Only

3.2.1 General Description

The AD6855 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 AD6855 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 AD6855 baseband receive section supports GMSK and 8-PSK applications. The AD6855 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 AD6855 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 AD6855 power management section provides voltage regulators for digital and analog components, a battery charger, battery protection circuitry, and power supply activation logic. The AD6855 digital processor interface provides serial ports for control data, baseband transmit and receive data, and two for audio data.

- 20 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

3.2.2 Power Block

CSPORT interface, power management control interface and the circuit that generates power up RESET pulses (RESET2P8 and 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 AD6855 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 AD6855 POWER BLOCK DIAGRAM

- 21 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Figure. 3-2-3 AD6855 KEYON/KEYOUT BLOCK DIAGRAM

Figure. 3-2-4 AD6855 RESET GENERATION BLOCK DIAGRAM

- 22 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

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.

- 23 -

3. TECHNICAL BRIEF

LGE Internal Use Only

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)

AD6855 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.

Baseband Analog (VABB)

The Baseband Analog regulator supplies the analog portions of the AD6855. 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.

- 24 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

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.

3.3 Power Amplifier Module(SKY77318, U601)

3.3.1 Internal Block Diagram

3.3.2 General Description

The SKY77318 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching circuitry for 50 ßŸ input and output impedances and a Power Amplifier Control (PAC) block with an internal current-sense resistor. The custom BiCMOS integrated circuit provides the internal PAC function and interface circuitry. Fabricated onto a single Gallium Arsenide (GaAs) die, one Hetero-junction Bipolar Transistor (HBT) PA block supports the GSM bands and the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pins to distribute current.

- 25 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Figure. 3-3-1 SKY77318 FUNCTIONAL BLOCK DIAGRAM

3.4 FEM (DGM1110M014, FL601)

The FEM is integrated of quadband RX SAWs, internal diplexer and ESD protection at Ant port to 8kV acc.

- 26 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

Figure 3-4-2 FEM CIRCUIT DIAGRAM

Figure 3-4-1 Band SW Logic Table

2

1

ANT_SW1 ANT_SW2

GSM850/900 TX L H

DCS/PCS TX H H

GSM850/900 RX L L

DCS/PCS RX H L

GND6

20

2V75_VCXO

C632 39p

C628

0.1u

R612

10

GND5

19

GND4

18

GND3

16

GND2

11

GND1

9

VDD

12

VC2

13

VC1

14

DGM1110M014

C643

FL601

100p

GSM1800_1900_TX

C644

100p

GSM850_900_TX

GSM1900_RX2 GSM1900_RX1 GSM1800_RX2 GSM1800_RX1

GSM900_RX2 GSM900_RX1 GSM850_RX2

ANT

GSM850_RX1

17

15 10

8 7 6 5 4 3 2 1

ANT_SW ANT_SW

3.5 RTC(FC-135, X100)

The AD6900 supports a Real Time Clock function. A total of 25pF+/-10% capacitance to graound is required (including board trace capacitance) on each OSCIN and OSCOUT. RTC functionality allows the application software to implement standard clock, calendar, or organizer functions.

A 32KHz clock is required in AD6900 based systems to take advantage of power saving “slow clocking” mode. A combination of an oscillator circuit within the AD6900 IC and an external 32KHz crystal results in a stable 32kHz clock for use in the system. The purpose of this application note is to discuss the system issues that affect operation of the 32kHz oscillator circuit.

- 27 -

3. TECHNICAL BRIEF

LGE Internal Use Only

Figure. 3-5-1 32.768KHz Crystal Basic Connections

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3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

3.6 Crystal(26 MHz, X601)

The AD6548 requires only an external low cost as the frequency reference. The circuitry to oscillate the crystal and tune its frequency is fully integrated. The Oscillator is a balanced implementation requiring the crystal to be connected across 2 pins. There is a programmable capacitor array included for coarse tuning of fixed offsets, and an integrated varactor for dynamic control. The oscillator is designed for use with a 26MHz crystal. The crystal is connected as shown in figure 3-3.

Figure. 3-6-1 Crystal Oscillator External Connection

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3. TECHNICAL BRIEF

LGE Internal Use Only

Dedicated control software ensures excellent frequency stability under all circumstances. The AD6548 reference oscillators provides a 26MHz 600mVpp (typical) output (REF_OP), for use as the baseband clock input.

The AD6548 integrates this frequency tuning range the tuning section comprises a switchable capacitor array for discrete steps and varactor for fine tuning. Contol of the tuning process is driven by software, whereby the frequency can be maintained accurately during reception gaps and initial frequency upon startup can be accurately estimated without the need for temperature sensors.

Figure. 3-6-2 Crystal Circuit Block Diagram

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3. TECHNICAL BRIEF

LGE Internal Use Only

Only for training and service purposes

3.7 RF Tranceiver(AD6548, U602)

3.7.1 GENERAL DESCRIPTION

The AD6548 provides a highly integrated direct conversion radio solution that combines, on a single chip, all radio and power management functions necessary to build the most compact GSM radio solution possible. The only external components required for a complete radio design are the Rx SAWs, PA, Switchplexer and a few passives enabling an extremely small cost effective GSM Radio solution. The AD6548 uses the industry proven direct conversion receiver architecture of the OthelloTM family. For Quad band applications the front end features four fully integrated programmable gain differential LNAs. The RF is then downconverted by quadrature mixers and then fed to the baseband programmable-gain amplifiers and active filters for channel selection. The Receiver output pins can be directly connected to the baseband analog processor. The Receive path features automatic calibration and tracking to remove DC offsets.

Figure. 3-7-1 CIRCUIT DIAGRAM of RF Tranceiver

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3. TECHNICAL BRIEF

The transmitter features a translation-loop architecture for directly modulating baseband signals onto the integrated TX VCO. The translation-loop modulator and TX VCO are extremely low noise removing the need for external SAW filters prior to the PA. The AD6548 uses a single integrated LO VCO for both the receive and the transmit circuits. The synthesizer lock times are optimized for GPRS applications up to and including class 12.

3.7.2 FUNCTIONAL DESCRIPTION

LGE Internal Use Only

Figure. 3-7-2 RECEIVER CHAIN BLOCK DIAGRAM

LG KF300 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual