BCM2121 ETC, BCM2121 Datasheet - Page 2

• Manufacturer Part Number: BCM2121
• Description: GPRS/GSM SINGLE CHIP BASEBAND PROCESSOR
• Manufacturer: ETC

The BCM2121 GPRS/GSM baseband processor offers a high level of
system integration, performance, and features for next-generation
handsets and radio cards. The BCM2121 is a single-chip baseband
device that is applicable for wireless handsets and speakerphones.
The integration of the PA controller and speaker/car phone audio
circuitry adds key GPRS handset features while reducing overall system
cost.
The BCM2121 contains all analog and digital GSM and multislot GPRS
baseband processing functions on a single silicon substrate. Interface
functions and drivers are integrated to enable auxiliary components such
as microphone, speaker, displays, keypad, data terminal equipment, and
SIM to connect directly to the chip. A flexible baseband control interface
supports a wide range of transceivers including GSM850, E-GSM900,
GSM1800, and GSM1900 frequency bands.
To accelerate our customers’ product development cycle and to enable
high-volume manufacturing, the BCM2121 also offers handset system
solutions, including:
• Complete handset and modem software, evaluation boards, reference
• GSM Certification Forum (GCF) and interoperability testing (IOT)
• Worldwide network field testing
To further reduce overall component count and BOM cost, the
BCM2121 integrates a number of typical PCB circuit functions such as
a PA controller, echo cancellation, noise suppression, and hands-free
answer sensing.
Broadcom
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
2121-PB03-R
designs, and integration support
®
, the pulse logo, and Connecting everything
11/13/03
®
SIM Card
PC/DTE
Keypad
SRAM
Hands-
Flash
LEDs
LCD
Free
GPRS/GSM Handset Functional Block Diagram
®
- IrDA
- UARTs
- Ringing
- Charging
- Slow-serial
- Speakerphone
are trademarks of Broadcom Corporation and/
Interface
Interface
External
Memory
Drivers
MMI
and
Voice Band CODEC
- MMI
- Services
- GSM/GPRS
- Voice recording
- Voice recognition
protocol stack
ARM7TDMI
RISC
ADC
DAC
O V E R V I E W
BCM2121
- Signal processing
- Speech algorithm
- Echo cancellation
- Noise suppression
RAM
Coprocessors
Hardware
Oak DSP
GMSK
Mod.
In addition, features such as the peripheral serial bus interface, integrated
1.8V/3V SIM, and multiplexed I and Q channels add flexibility when
connecting to other onboard components.
On-chip hardware accelerators work in concert with HSCSD and GPRS
software to allow user data speeds up to 57.6 Kbps and 84.4 Kbps. In
addition to these multislot capabilities, the BCM2121 contains legacy
GSM voice circuitry (adding all of the AMR modes) for voice
applications. On the ARM, the V.42bis compression yields up to a 4×
rate increase for GPRS and HSCSD traffic.
The ARM7TDMI processor runs the high-level application software,
such as the SATK, WAP browser, voice recognition/recording, and user
interface. The processor can interface with various polyphonic ringer
chips and control two black and white or color LCD panels for high-end
handsets.
The Oak DSP performs the GSM physical layer functions, including
voice and baseband codecs, speech coding, channel coding and
interleaving, and RF interface transceiver control. To minimize power
consumption, the Oak DSP uses hardware coprocessors for computation-
intensive processing functions. Echo cancellation and noise suppression
software is also included on the DSP to target speakerphone and other
noisy environments.
Baseband CODEC
ROM
DAC
ADC
Auxiliary Functions
Timers
Digital RF Control
ADC
PA Control
AFC
MUX
DAC
PLL
13 MHz
Charger
32 kHz
Battery
XTAL
Conv.
Quad
Down
Mod.
Transceiver
Synth.
VCO
x
PA
L
N
A
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com