Baseband Overview; Introduction - Panasonic EB-G50 Service Manual

5.2. Baseband Overview

5.2.1. Introduction

The Baseband circuits of the phone are required to perform the following functions:
8 Equalization
8 Channel coding / decoding
8 Speech coding / decoding
8 Data Encryption
8 Layer 1, 2 and 3 software tasks
8 Man Machine interface (MMI)
8 System Interface
8 SIM Interface and Management
8 Audio and Tone Generation
8 Power supply and battery management
8 RF power control
8 Synchronization
8 Real time clock
13MHz_BB
R.F.
Block
TX IQ
RX IQ
Control Signal
VINNOR P/N
MIC
VOUTNOR P/N
Receiver
VINAUX P/N
Phone Analog
Audio
VOUTAUX P
Jack Switch
PJ_FUNC_SEL
HPOUT
Speaker
LDO 3.0V
The EB-G50 Baseband is built around a GSM chipset developed by Advanced Device. One chip (AD6525) carries out
signal processing with DSP and CPU, and the other chip (AD6521) provides the analogue interface.
The highly integrated nature of the chips means that each contains a large number of functions.
Keypad Data bus
Keyboard
BBCLK
Buffer
VTCXO
RF Control Bus
RTC
32.768kHz
Crystal
SIM interface
SIM
SIMVCC
Socket
A,V,B
ADC/DAC
serial Port
VoiceBand
TX/RX
&
BaseBand
Codec.
VCORE
(AD6521)
VANA
Buzzer(L_SPK Mode)
Meledy IC
Control /Data
Interface
YMU_AVCC
PJ_FUNC_SEL
Figure 5.5. Baseband Block Diagram
VBAT V_LED
Backlight
Vibrator
LED
GPIO12
CLKIN
BACKLIGHT
GPO22
GPIO6
Address Bus
OSC
Data Bus
GSM Processor
(AD6525)
LCD Control Bus
Charging control interface
VCORE
VCC
VMEM
VMEM
VANA
RTC
Battery
VTCXO
VRTC
VRTC
GPIO 13
SIMVCC
– 5–6 –
USC Data Bus
TX/RX
Handfree input
HANDFREE IN
Memory
VMEM
Flash/SRAM
(64MB / 16MB)
White LED
DRV 4.5V
V_LED
LCD_PWR
LCD Module LDO 3.0V
VCORE
OverVoltage
Charging
Circuit Protect Circuit
VMEM
VANA
Power
Management
P MOSFET
(ADP6522)
VTCXO
VRTC
VBAT
Li-Ion
VSIM
VBAT
Battery
EXTPWR
Power
Jack