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參數(shù)資料
| 型號： | BCM4201 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大小： | 39K |
| 代理商： | BCM4201 |
The
BCM4201
Universal Satellite Receiver is an integrated digital
transmission solution for satellite Integrated Receiver Decoders
(IRDs). Integrated features in the
BCM4201
include a 2-85 Mbps
variable rate BPSK/QPSK/OQPSK receiver, dual 8-bit A/D
converters, a phase/frequency recovery block, variable rate digital
filters, square-root Nyquist matched filters, acquisition and
tracking loops, and a DVB/DIRECTV
/Digicipher
TM
II compliant
concatenated Viterbi/Reed-Solomon FEC decoder with
deinterleaver. The receiver accepts an analog baseband or IF
modulated (up to 480 MHz) signal, and transmits a demodulated
error corrected output data stream. The
BCM4201
supports the
DVB digital transmission standard for satellite broadcasting, that
is in worldwide use today, the DIRECTV digital transmission
standard and Digicipher II ITU-R 217/11 digital transmission
standard.
Analog waveforms received by the
BCM4201
are sampled by
the integrated A/D converters, digitally mixed to baseband,
resampled, and filtered by dual square-root Nyquist filters.
Optimized soft decisions are delivered to a programmable rate
64-state Viterbi decoder, frame synchronization block,
deinterleaver, t=8 Reed-Solomon FEC, and derandomizer. The
final error-corrected output is delivered in MPEG-2 or
DIRECTV transport stream format.
The
BCM4201
is a very flexible, cost-effective solution. It is
compatable with DVB, DIRECTV and Digicipher II ITU-R
217/11 standards, enabling manufacturers to design the
BCM4201
into a single-standard IRD or a multi-standard IRD.
The receiver supports variable bit rates up to 85 Mbps, which
allows it to adapt to various satellite transponders in Europe,
North America, and Asia. The
BCM4201
is capable of
supporting low rate applications, down to 1 MBaud, for
applications such as SCPC. The
BCM4201
is optimized for
high-volume manufacturing. This level of integration in the
BCM4201
significantly reduces the cost and complexity of
manufacturing IRDs.
The
BCM4201
contains an extremely accurate on-chip
BER tester to simplify laboratory set-up and system
optimization. Specialized circuitry has been implemented
to virtually eliminate cycle slips.
B C
M 4 2 0 1 O V
E
R
V
I E
W
Phase/
Frequency
Recovery
JTAG[3:0]
RA_I +/-
AGC_CTRL
S_DATA
S_VALID
S_CLK
S_SYNC
MICRO[3:0]
P_DATA[7:0]
LNB_CTRL
Variable
Rate
Demod/
Equalizer
8
8
Viterbi
Decoder
k=7
Synch &
Deinter-
leaver
I=12,13
RS
Decoder
t=8
&
Descram
Deinterleaver
RAM
M-Bus/SPI
Interface
JTAG
Interface
Acquisition/Tracking Loops
and Clock Generation
A/D
Down
Conversion
Pre-processing
A/D
Nyquist
α
= .20 - .35
Nyquist
α
= .20 - .35
Phone: 949-450-8700
FAX: 949-450-8710
Email: info@broadcom.com
Web: www.broadcom.com
Broadcom
, the pulse logo
and
Connecting Everything
TM
are trademarks of
Broadcom Corporation and/or its subsidiaries in the United States and certain other countries.
Digicipher
TM
is a trademark of General Instrument (now Motorola).
DIRECTV
is a registered trademark of DIRECTV, INC., a unit of Hughes Electronics Corporation.
All other trademarks are the property of their respective owners.
BROADCOM CORPORAT ION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
2002 by BROADCOM CORPORATION. All rights reserved.
4201.PB02-R-4.12.02
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