GSM/DCS1800/PCS1900
Baseband Processing Chipset
a
AD20msp415
SYSTEM ARCH ITECTURE
FEATURES
Com plete Baseband Processing Chipset Perform s:
Speech Coding/ Decoding (GSM 06.XX)
Channel Coding/ Decoding (GSM 05.03)
Equalization w ith 16-State Viterbi, Soft Decision
All ADC and DAC Interface Functions
Includes All Radio, Auxiliary and Voice Interfaces
Support for GSM Data Services
AD20msp415
VOICEBAND/
BASEBAND
CODEC
AD6421
256K 16
ROM
Em bedded 16-Bit Microcontroller
Em bedded 16-Bit DSP
Integrated SIM and Keyboard Interface
Interface to AD6430 GSM RF Chipset
Interface to EFR Coprocessor
RADIO
SIM
128K
RAM
8
DISPLAY
2K
GSM
PROCESSOR
8
EEPROM
AD6422
DATA
TERMINAL
ADAPTER
J TAG Boundary Scan
KEYPAD
Layer 1 Softw are Provided w ith Chipset
Softw are Com patible w ith AD20m sp410
Full Phase 2 Protocol Stack Softw are Available
Full Reference Design Available for
Baseband Section and Radio Section
Ultralow Pow er Design
CH IP SET CO MP O NENTS
GSM P r ocessor (GSMP )
2.7 V to 3.3 V Operating Voltage
T he 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. T he DSP
implements full rate speech transcoding according to GSM
specifications, including Discontinuous T ransmission (DT X)
and Comfort Noise Insertion (CNI). A high performance soft-
decision Viterbi equalizer is also implemented in software em-
bedded in the DSP. T he embedded microcontroller executes
the Layer 1, 2, 3 and user MMI software. T he 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.
Intelligent Pow er Managem ent Features
XXX m W Pow er Dissipation in Talk Mode
XX m W Pow er Dissipation in Standby Mode
Tw o TQFP Devices, Occupying Less than 7.5 cm2
APPLICATIONS
GSM/ DCS1800/ PCS1900 Mobile Radios
GENERAL D ESCRIP TIO N
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. T he AD20msp415 is the higher integrated successor of
the AD20msp410 chipset, which passed European GSM T ype
Approval in June, 1996.
Voiceband/Baseband Conver ter (VBC)
T he 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. T he 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.
T he chipset consists of two highly integrated, sub-micron, low
power CMOS components that perform the entire baseband
signal processing of the GSM handset. T he system architecture
is designed to be easily integrated into current designs and form
the basis for next generation designs.
Softwar e
T he 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.
T he 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
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1997
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