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參數(shù)資料
| 型號： | AD6421AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | GSM/DCS1800/PCS1900 Baseband Processing Chipset |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP64 |
| 封裝： | LOW PROFILE, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 66K |
| 代理商： | AD6421AST |
AD20msp415
–4–
REV. 0
C AUT ION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD20msp415 features proprietary ESD protection circuitry, permanent damage
may occur on devices subjected to high energy electrostatic discharges. T herefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
Generation of Auxiliary Audio Signals
Under control of Layer 1, the GSMP can generate a variety of
fixed and user-programmable tones. T his includes all standard
DT MF and Call Progress tones as well as user defined tones.
T he tone structure can consist of up to four frequency compo-
nents with individual durations. T he GSMP also generates
T alker Sidetone as specified in the GSM recommendations. In
comparison to traditional hardware implementations, this soft-
ware implementation provides manufacturing flexibility over a
wide range of speaker/microphone sensitivities.
AD6421
SERIAL
VOICE
PORT
SERIAL
AUXILIARY
PORT
AUXILIARY ADC
FILTER
FILTER
ADC
PGA
MUX
CAR
KIT
U
BAT
OTHER
TEMP
ADC
PGA
MUX
MUX
Figure 3. Audio/Auxiliary Section of the AD6421
Figure 3 shows the audio section and the auxiliary ADC of the
VBC. Input signals can come from either a directly connected
microphone or from a remote microphone in a car kit. Input
gain can be set to 0 dB or +26 dB. T he output signal can be
directly connected to a small earpiece and, for further amplifica-
tion, to an external car kit. T he output PGA can be programmed
for –15 dB or +6 dB.
DAT A SE RVICE S
Data Services is considered to be an essential feature for GSM
terminals and the AD20msp415 chipset is designed to provide
flexible and low cost implementation of Data Services supported
via the GSM air interface.
T he selected system architecture shown in Figure 4 provides for
minimum terminal Bill of Materials, the lowest possible number
of interconnection points and the lowest power consumption
when running speech traffic only. T he GSMP performs full
channel coding and decoding for T CH/F9.6, T CH/F4.8 and
T CH/F2.4 data rates. T he interface to the chipset is a user-
configurable, 3-wire synchronous or asynchronous serial inter-
face supplying V110′data packets as defined in GSM 05.03,
combined with protocol information and control to the Applica-
tion Layer.
External to the terminal is the Data T erminal Adapter (DT A)
that runs the Data Services Software. Included in the DT A are
the rate adaptation functions and the Data Services application.
T he Command Interpreter resident on the mobile supports a
serial interface protocol with the DT A by which both traffic data
and control information are communicated.
V110'
FRAMES
MAN MACHINE INTERFACE
DATA APPLICATION
LAYER 2 RELAY (L2R)
RADIO LINK PROTOCOL (RLP)
RATE ADAPTION
EXTERNAL
DATA TERMINAL
ADAPTER
HANDSET
APPLICATION LAYER
FOREGROUND
COMMAND
INTERPRETER
FRAME
ROUTER
DATA TERMINAL
ADAPTER
APPLICATION LAYER
BACKGROUND
PROTOCOL STACK
LAYERS 2/3
PROTOCOL STACK
LAYER 1
AD20msp415
CHIPSET
Figure 4. Implementation of Data Services
SOFT WARE IMPLE ME NT AT IONS
A full implementation of the GSM Layer 1 functionality is sup-
plied as an object code module, for execution on the controller,
embedded in the GSMP. Functions performed by this software
include:
Initial scan of GSM/E-GSM/PCN band and selection of
strongest thirty channels as required by 03.22 and 05.08.
Mobile oscillator adjustment, timing synchronization and
BCCH decoding from serving cell (camping-on).
Base station frequency and timing measurements and BSIC
extraction from neighbor cells under control of Layer 3.
Frequency hopping according to 05.02.
Full implementation of discontinuous reception (DRX ) and
transmission (DT X ).
Reporting of received level and signal quality.
Full engineering and test mode support.
Support for all phase 1 and phase 2 handover modes.
SIM Interface driver.
Message interfacing to Layer 3 (Radio Resources Manager)
and Layer 2 (data link layer, both signaling and data).
External functions for AGC, AFC and synthesizer setting are
called by Layer 1. T hese allow the user to configure the sys-
tem for a wide range of radio architectures.
T he higher layers of the protocol stack also reside on this em-
bedded processor.
WARNNG
ESD SENSITIVE DEVICE
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| AD6422AST | 制造商:AD 制造商全稱:Analog Devices 功能描述:GSM/DCS1800/PCS1900 Baseband Processing Chipset |
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