AD6423 查看數據表（PDF） - Analog Devices
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AD6423 Datasheet PDF : 8 Pages
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AD20msp415
TEST
INTERFACE
SIM CARD
FLASH
SRAM
DISPLAY
CONTROL
BACKLIGHT
KEYPAD
EEPROM
DATA
INTERFACE
TEST
INTERFACE
SIM
INTERFACE
ACCESSORIES
CLKIN
ADDRESS
DATA
DAI CONTROL
VBC INTERFACE
GSMP
DISPLAY
CONTROL
BACKLIGHT
CONTROL
CLKOUT
POWER
CONTROL
KEYPAD
INTERFACE
EEPROM
INTERFACE
COPROCESSOR
INTERFACE
DATA
INTERFACE
SYNTHESIZER
AND RADIO
CONTROL
13MHz
VCTCXO
DAI
INTERFACE
CLOCK
POWER
SUBSYSTEM
COPROCESSOR
(OPTIONAL)
VOICEBAND
ANALOG I/O
AFC DAC
SERIAL
PORTS
RAMP DAC
VBC
MCLK
AGC DAC
AUX ADC BASEBAND
ANALOG I/O
Figure 5. Chipset Interfaces
CAR KIT
POWER
AMPLIFIER
RADIO
IF
AMPLIFIER
MODULATOR
DEMODULATOR
SYNTHESIZER
AND RADIO
CONTROL
Digital Interface from the GSMP to Accessories
To allow proper control of external accessories like a car kit, the
AD6422 provides a 10-pin accessory interface comprised of
eight general purpose I/O channels, one chip select and one
power control signal.
Digital Test Interface
The AD6421 and the AD6422 both support advanced test
methodologies by providing JTAG Boundary Scan. Addition-
ally, the AD6422 provides Test/Mode pins, which select differ-
ent test and operating modes.
Digital Interface from GSMP to Optional EFR-Coprocessor
The AD6422 provides a digital interface to an external EFR
Coprocessor (DSP). This coprocessor is required to handle the
Enhanced Full Rate speech codec in PCS1900 mobile radios.
Baseband Processing Key Parts List
Table I lists the major hardware components necessary to com-
plete the GSM baseband processing subsystem.
Table I. List of Key Components
Description
GSMP1
VBC1
EFR-Coprocessor2
FLASH3
SRAM
EEPROM4
Display Driver
Specification
AD6422
AD6421
AD6423
256K × 16, 150 ns
128K × 8, 120 ns
2K × 8
Design Specific
NOTES
1These components comprise the AD20msp415
chipset.
2The EFR-Coprocessor is required only in systems
requiring support of the Enhanced Full Rate speech
codec.
3A size of 4 Mbits is recommended to allow storage of
all GSM Layer (1, 2, 3) programs for GSM Phase 2
as well as a typical User Interface (MMI).
4Can be omitted if parameters are stored in FLASH
memory.
–6–
REV. 0
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