BCM3138
DUAL UNIVERSAL ADVANCED TDMA PHY-LAYER BURST RECEIVER
The BCM3138 is a universal headend advanced TDMA physical layer
QPSK/QAM burst receiver
DOCSIS/EuroDOCSIS-based, IEEE 802.14, DAVIC and DVB
compliant
Programmable demodulation including BPSK, QPSK, 8, 16, 32, 64, 128
and 256 QAM formats
Variable symbol rates from 160 Kbaud to 5.12 Mbaud providing 320
Kbps to 40 Mbps operation
Powerful Reed Solomon FEC decoder with byte deinterleave options
for impulse/burst noise mitigation
Burst acquisition as fast as 16 preamble symbols
On-board 10-bit analog-to-digital converters for each channel
Direct sampling option for DOCSIS and EuroDOCSIS via 12-bit digital
input operating at 160 MHz with LVDS or TTL level interface options
Powerful on-board equalizer provides ingress and adjacent channel
overlap protection
Integrated Fast Fourier Transform (FFT) processor with variable FFT
sizes and programmable window options
I
2
C or SPI-compatible microcontroller interface
JTAG test interface
208-pin PQFP package
Operates over industrial temperature range (-40 to +85 degrees C)
Presents a high-performance, integrated solution for upstream
demodulation in cable over data, video and telephony applications.
Two independent burst receivers per package enable high-density
equipment designs, reducing equipment floor space requirements.
Based on DOCSIS/EuroDOCSIS standards for use in Cable Modem
Termination Systems (CMTS).
Seamless integration with BCM3212 Advanced CMTS MAC.
Applies to digital CATV reverse-channel receiver.
High bps/Hz modulation enables advanced digital services over
narrow RF channels.
Includes flexible analog front end options.
Use of on-board ADCs minimizes external components.
Direct sampling option via external 12-bit ADC minimizes RF
components.
On-board equalizer enables operation of digital services under
challenging plant conditions.
On-chip FFT enables spectrum analysis and management of the entire
upstream channel.
Small footprint enables high-density equipment.
Deploys advanced functions in harsh environments.
Distributed CMTS in Hybrid Fiber Coaxial Fiber Node
F E A T U R E S
S U M M A R Y O F B E N E F I T S
BCM3138
Dual Adv. TDMA
Receiver
BCM3138
BCM3138
5-65 MHz Upstream
Routing/
Classification
Engine
Ethernet
System
CPU
Memory
PCI Bus
BCM3212
Advanced
CMTS MAC
Downstream
SDRAM
(PHS,
output
queues)
BCM3034
Advanced QAM
Modulator
LPF
PA
WAN
44 MHz IF
Cable Modem Termination System (CMTS) Block Diagram
O V E R V I E W
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
2004 by BROADCOM CORPORATION. All rights reserved.
3138-PB04-R
07/01/04
Broadcom
, the pulse logo, and Connecting everything
are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
The BCM3138 QAMLink Universal QPSK/QAM burst receiver is a
highly integrated solution that significantly decreases the board space
and cost of demodulators in digital cable modem head-ends applications.
The BCM3138 provides two independent cable network receivers that
accept QPSK and m-QAM burst data in frequency-agile, time-division
multiple access (TDMA) schemes. Advanced features in the BCM3138
include an analog front end (AFE), a QAM demodulator, a generalized
equalizer and an enhanced Reed Solomon (RS) FEC decoder with
dynamic deinterleaving.
The AFE provides coarse gain setting and A-to-D conversion (ADC) on
either an IF input or baseband I/Q inputs. When the internal ADC is
bypassed, the on-chip digital mixer translates the desired signal at RF to
true DC where the I and Q samples pass through variable decimators and
matched raised-cosine filters. The BCM3138 incorporates unique word
detections of programmable length and pattern in the burst preamble for
signal acquisition as fast as 16 symbols. An adaptive equalizer and
ingress canceller characterizes the RF channel response, cancels ingress
noise and removes inter-symbol interference (ISI) caused by micro-
reflections in the channel. The FEC decoder consists of a programmable
d e- r and omi zer , a p r ogr amm abl e R S de code r wit h T val ue s
programmable up to 16 and a byte deinterleaver with burst-by-burst
reconfiguration capability.
The BCM3138 delivers the recovered data stream and accepts receiver
control inputs through a receive interface linked to a DOCSIS MAC chip
such as the BCM3212. The BCM3138 prepends ranging and data
information to each received code word and packet for processing by the
BCM3212. The BCM3138 can be configured through either an SPI or
I2C-compatible serial interface.
The BCM3138 is a highly integrated, mixed-signal and cost-effective
device providing a worldwide solution for burst receiver applications.
The dual receiver design of the BCM3138 is packaged in a 208-pin
PQFP, enabling a significant increase upstream channel density for
head-end based CMTS equipment. The BCM3138, combined with the
BCM3034 QAMLink Universal Modulator and the BCM3212
Advanced QAMLink CMTS MAC, provides a complete solution for
advanced cable headend equipment.
DAP/N
A_IP/N
FFT STRT
FFT CLK
FFT DATA
FFTDV
DBP/N
B_IP/N
CKIP/N
24
2
2
2
24
JTAG
FFT
Processor
DDFS
AFE
(ADC
and
MUX)
Digital
Complex
Mixer
I
Q
Variable
Decimator
Variable
Decimator
Matched
Filter
Matched
Filter
Ranging
Block
Preamble
Process
Tracking
Loops
De-
scrambler
RS
Decoder
QAM
Burst
Demodulation
Adaptive
Equalization
and
Ingress
Cancellation
Deinterleaver
FEC Interface
and FIFOs
MAC/
PHY
Interface
Ch-A
4
13
6
6
24
4
5
MAC/PHY
Interface
Ch-B
Micro Interface
PLL & Clock Generation
Bypass/
Probe
Exit Control
Receive Channel B
RACLK
RASOBN
RADV
RADATA[3:0]
RADATAP
MSCLKA
MAPCLKA
MAPDVAN
MAPDATA
INTAN
EXCTLA[5:0]
EXCTLB[5:0]
TPA/B[11:0]
TM[3:0]
SDA
SCL
SCK MOSI
MISO
SPI
I
2
C
ADDR[6:2]
ADDR1
ADDR0
SS
RESET
XTALO
XTALI
PLLBYP
TDO
TDI
TMS
TCK
PDF 
ZIP