BCM3520
®
ConnecTV™ Plug and Play DTV Receiver
FEATURES
•
Integrated VSB/QAM QAMLink® receiver
12-bit A/D converter with internal AGC amplifier
Full equalizer architecture spans up to –35 to 49 µs delays
Direct IF sampled architecture reduces system cost
Single IF signal path for QAM/VSB/NTSC to reduce system
costs
-
ITU-T J.83 Annex A/B/C FEC modes
-
MPEG-2 transport output (serial/parallel)
-
All-digital clock and carrier recovery
-
Integrated PLLs to minimize external components
-
All acquisition times typically less than 50 ms
•
QPSK out-of-band receiver
-
100–200 MHz receiver LO with input AGC and 6-bit A/D
-
Variable symbol rate QPSK receiver
-
Digital demodulator, Nyquist filters, tracking loops, and
four-tap adaptive equalizer
-
DVS-167 (Davic)/DVS-178 (DigiCipherII) FEC decoder
•
NTSC/PAL IF Demodulator
-
Adjacent channel rejection filters
-
Programmable digital audio trap filter
-
Programmable group delay compensation filter
-
Analog Composite Video Baseband Signal (CVBS) output
-
FM demod output supports internal BTSC stereo decoder,
external BTSC stereo decoder (baseband or IF input), or
external Zweiton M decoder
•
Integrated acquisition controller
-
-
-
-
SUMMARY OF BENEFITS
•
Complete DTV single chip receiver solution
•
FCC VSB and Plug and Play functionality
•
Superior performance under both static and dynamic multi-
path channel conditions
•
Integrated NTSC demodulator
•
BTSC decoder on chip
•
Direct interface to CMOS and discrete DTV tuners
•
Reduces system costs through direct IF sampling
•
Single IF path for QAM/VSB/NTSC simplifies board design
•
Smart antenna support
•
Automatic NTSC co-channel interference and RFI rejection
filters
•
Integrated de-interleaver RAM for VSB FEC, and QAM for
modes up to J=4 reduces system costs
•
Analog stereo, mono, or SAP outputs
•
I2S or baseband multiplexed audio output
•
On-chip stereo audio DACs
•
BSC master to control peripherals
•
EIA/CEA-909 antenna interface
•
144-pin LQFP package
Plug and Play DTV System Solution
BCM3419
LNA
Tuner
MPEG Transport Serial/Parallel
BCM3520
VSB/QAM
OOB/POD
OOB
Tuner
EIA/CEA-909
Smart Antenna Interface
Composite Video
Audio: I2S, L/R, multiplex baseband, IF audio
Out-of-band Transport
OVERVIEW
Functional Block Diagram
BSC/SPI Host
Interface
Interrupt
BSC/SPI
Slave
Interface
HAB
Acquisition
Processor
Internal Bus
To All Blocks
Master
PLL
54 MHz
3
rd
Overtone
Crystal
Inband Tuner
Inband AFE
PGA
12 bit A/D
AGC Control
ATSC 8/16 VSB
Advanced
Receiver
ATSC FEC
Output
Interface
MPEG
Transport
Inband AGT
Inband AGI
Inband AFT
16-1024 QAM
Advanced
Receiver
ITU-T J.83
Annex A/B/C FEC
10 Bit D/A
OOB Tuner
OOB AGC
OOB VCO
OOB AFE
PGA
6 bit A/D
AGC Control
VCO
NTSC IF
DEMODULATOR
10 Bit D/A
Compostie
NTSC
IF Audio
I2S
BTSC
Decoder
OOB QPSK
Receiver
DVS-167 FEC
DVS-178 FEC
HiFi
DAC
L/R Audio
or
Multiplexed
Baseband Audio
OOB Transport
for CableCard/
POD
OOB
Output
Interface
BSC Master
Interface
GPIO/GPO
Interface
EIA/CEA-909
Interface
JTAG
Interface
Tuner/Peripheral
Control
GPIO
GPO
Antenna
Control
JTAG
Controller
The BCM3520 is a Plug and Play DTV receiver. It contains a digital
receiver compatible with both North American digital cable television
and digital terrestrial broadcast television standards. This receiver is
capable of receiving all standard-definition and high-definition digital
formats (SDTV/HDTV). It also contains an IF demodulator compatible
with the NTSC video standard. The output of the IF demodulator can be
directed to an external BTSC or Zweiton M decoder, or can be sent to an
on-chip audio decoder. The on-chip audio decoder is fully compliant
with the BTSC audio standard. An out-of-band QPSK receiver is also
contained to meet the needs of the CableCard specification.
The BCM3520’s digital receiver and NTSC demodulator accepts an
analog signal centered at the standard television IF frequencies. It
amplifies and digitizes this signal with an integrated programmable gain
amplifier and 12-bit A/D converter. The output of the A/D is sent to the
receiver and demodulator. The digital receiver consists of a QAM
demodulator and a VSB demodulator. Each demodulator contains
adaptive filters that remove multi-path propagation effects, NTSC co-
channel interference, and RFI interference. The output of the VSB
demodulator goes to an ATSC A/53 coding Forward Error Corrector
(FEC), with integrated trellis and Reed Solomon decoder. The output of
the QAM demodulator goes to an ITU-T J.83 Annex A/B/C coding FEC.
The output of either QAM or VSB FEC is delivered in either parallel or
serial MPEG-2 transport format. The NTSC demodulator filters and
demodulates the analog NTSC and FM audio signals and delivers a
composite output via an on-chip 10-bit DAC. An IF modulated audio
output is also provided via a second on-chip 10-bit DAC. An on-chip
BTSC decoder handles the decoding of the base-band multiplexed audio
from the IF demod, providing an stereo left/right, mono, or SAP output
via a pair of high precision HiFiDACs.
All gain, clock, and carrier, acquisition, and tracking loops are integrated
on-chip as are the necessary phase-locked loops, referenced to a single
external crystal.
Chip configuration, channel acquisition, and performance monitoring
functions are conducted by the on-chip acquisition processor using
Broadcom-provided software.
Broadcom
®
, the pulse logo, and
Connecting everything
®
, and
QAMLink
®
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.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
3520-PB01-R
04/02/03
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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