Table of Contents
Advertisement
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
TXIQ
RXIQ
Control Signal
VBAT
Backlight
LED
VINNO R P/N
MIC
VOUTNOR P/N
Receiver
Phone
Analog
Voice
Data
Jack
Switch
PJ_FUNC_SEL
VOUTLOUDP/N
Speaker
The EB-A100 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 (AD6537) provides the analogue interface.
The highly integrated nature of the chips means that each contains a large number of functions.
BBCLK
Buffer
VVCXO
RF Control Bus
GSM Analog
Baseband and
Codec & Power
Management
(AD6537)
Charging
Circuit
BACKLIGHT
LIGHT 1/2/3
AIN1P/1N
VBAT
AOUT1P/1N
TX/RX
VCORE
VMEM
VINAUXP/N
VEXT
AIN2P/2N
VEXT
VOUTAUXP
VSIM
AOUT3P/3N
VSIM
VRTC
VABB
VABB
VVCXO
VVCXO
VMIC
AOUT2P/2N
VMIC
Figure 5.5. Baseband Block Diagram
Keypad Data Bus
Keyboard
CLKIN
A,B,C Serial Port
EXTPWR
Power
Over Voltage
Protect Circuit
Jack
GSM Digital
PMOSFET
Li-Ion
Battery
VCORE
VCC
VMEM
VMEM
VRTC
VRTC
RTC
Battery
PJ_FUNC_SEL
– 5-6 –
VBAT
Vibrator
GPIO12
GPIO6
Address Bus
Data Bus
Baaseband
Processor
(AD6525)
LCD Control Bus
32.768 kHz
OSC
Crystal
SIM Interface
VSIM
GPIO13
USC Data Bus
TX/RX
Handfree Input
HANDFREEIN
Memory
VMEM
Flash/SRAM
(32MB/4MB)
VMEM
LCD Module
RTC
SIM
Socket
Advertisement
Table of Contents
