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FEATURES
Complete Baseband Processing Chipset Performs:
Speech Coding/Decoding (GSM 06.XX)
Channel Coding/Decoding (GSM 05.03)
Equalization with 16-State Viterbi, Soft Decision
All ADC and DAC Interface Functions
Includes All Radio, Auxiliary and Voice Interfaces
Support for GSM Data Services
Embedded 16-Bit Microcontroller
Embedded 16-Bit DSP
Integrated SIM and Keyboard Interface
Interface to AD6430 GSM RF Chipset
Interface to EFR Coprocessor
JTAG Boundary Scan
Layer 1 Software Provided with Chipset
Software Compatible with AD20msp410
Full Phase 2 Protocol Stack Software Available
Full Reference Design Available for
Baseband Section and Radio Section
Ultralow Power Design
2.7 V to 3.3 V Operating Voltage
Intelligent Power Management Features
XXX mW Power Dissipation in Talk Mode
XX mW Power Dissipation in Standby Mode
Two TQFP Devices, Occupying Less than 7.5 cm
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APPLICATIONS
GSM/DCS1800/PCS1900 Mobile Radios
GSM/DCS1800/PCS1900
Baseband Processing Chipset
AD20msp415
SYSTEM ARCHITECTURE
AD20msp415
VOICEBAND/
BASEBAND
CODEC
256K 16
ROM
128K 8
RAM
DISPLAY
2K 8
EEPROM
KEYPAD
GSM
PROCESSOR
AD6422
AD6421
RADIO
SIM
DATA
TERMINAL
ADAPTER
CHIPSET COMPONENTS
GSM Processor (GSMP)
GENERAL DESCRIPTION
The Analog Devices GSM Baseband Processing Chipset provides
a competitive solution for GSM based Mobile Radio Systems.
It is designed to be fully integrated, easy to use, and compat-
ible with a wide range of product solutions. Examples are
GSM900, DCS1800, PCS1900 handsets and PCMCIA data
cards. The AD20msp415 is the higher integrated successor of
the AD20msp410 chipset, which passed European GSM Type
Approval in June, 1996.
The chipset consists of two highly integrated, sub-micron, low
power CMOS components that perform the entire baseband
signal processing of the GSM handset. The system architecture
is designed to be easily integrated into current designs and form
the basis for next generation designs.
The chipset uses an operating supply voltage of 2.7 V to 3.3 V
which, coupled with the extensive power management features,
significantly reduces the drain on battery power and extends the
handsets talk time and standby time.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
The AD6422 combines application specific hardware, an em-
bedded 16-bit DSP and an embedded 16-bit microcontroller
(Hitachi H8/300H). It performs channel coding and decoding
and executes the protocol stack and user software. The DSP
implements full rate speech transcoding according to GSM
specifications, including Discontinuous Transmission (DTX)
and Comfort Noise Insertion (CNI). A high performance soft-
decision Viterbi equalizer is also implemented in software em-
bedded in the DSP. The embedded microcontroller executes
the Layer 1, 2, 3 and user MMI software. The required Layer 1
software is supplied with the chipset. To ensure minimum power
consumption, the GSMP has been designed to control all the
power-down functions of the other components in the handset.
Voiceband/Baseband Converter (VBC)
The AD6421 performs the voiceband and baseband analog-to-
digital and digital-to-analog conversions, interfacing the digital
sections of the chipset to the microphone, loudspeaker and radio
section. In addition, the VBC contains all the auxiliary convert-
ers for burst-ramping, AFC, AGC, battery and temperature
monitoring. The chipset interfaces directly with the radio and
supplies all the synthesizer and timing control signals required
to support two synthesizers and a variety of radio architectures
including the AD6450 GSM RF-Chipset.
Software
The required Layer 1 software is supplied with the chipset. In
addition, an object code license is available for Layers 2 and 3 of
the protocol stack.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
漏 Analog Devices, Inc., 1997
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