BCM3520 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – CONNEC TV PLUG AND PLAY DTV RECEIVER

OVERVIEW
Functional Block Diagram
BSC/SPI Host
Interface
Interrupt
Inband Tuner
Inband AGT
Inband AGI
Inband AFT
BSC/SPI
Slave
Interface
Inband AFE
PGA
12 bit A/D
AGC Control
OOB Tuner
OOB AGC
OOB VCO
OOB AFE
PGA
6 bit A/D
AGC Control
VCO
OOB QPSK
Receiver
DVS-167 FEC
DVS-178 FEC
HAB
Acquisition
Processor
Internal Bus
To All Blocks
Master
PLL
ATSC 8/16 VSB
Advanced
Receiver
16-1024 QAM
Advanced
Receiver
ATSC FEC
ITU-T J.83
Annex A/B/C FEC
NTSC IF
DEMODULATOR
BTSC
Decoder
BSC Master
Interface
GPIO/GPO
Interface
EIA/CEA-909
Interface
Output
Interface
10 Bit D/A
10 Bit D/A
HiFi
DAC
OOB
Output
Interface
JTAG
Interface
54 MHz
3^rd Overtone
Crystal
MPEG
Transport
Compostie
NTSC
IF Audio
I2S
L/R Audio
or
Multiplexed
Baseband Audio
OOB Transport
for CableCard/
POD
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: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com