O V ERVI EW

®

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

© 2006 by BROADCOM CORPORATION. All rights reserved.

3517-PB03-R

10/23/06

logo are among the trademarks of Broadcom Corporation and/or its affiliates in the United States, certain

other countries and/or the EU. Any other trademarks or trade names mentioned are the property of their

respective owners.

BCM3517 Block Diagram

The BCM3517 is an ATSC/VSB Digital Cable Ready DTV receiver that

contains a digital receiver that is 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). An out-of-band

QPSK receiver is also contained to meet the needs of the CableCARD

specification.

The BCM3517’s digital receiver accepts an analog signal centered at the

standard television IF frequencies, and 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

multipath 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.

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.

BSC/SPI Host

Interface

Antenna

Control

JTAG

Controller

MPEG

Transport

OOB Transport

for CableCard/

POD

Tuner/Peripheral

Control

54-MHz

Overtone

Crystal

GPIO

OOB Tuner

Inband Tuner

GPO

Inband AGT

Interrupt

Inband AGI

Inband AFT

OOB AGC

OOB VCO

Internal Bus

To All Blocks

BSC/SPI

Slave

Interface

HAB

Master

PLL

Acquisition

Processor

Inband AFE

PGA

12-bit A/D

AGC Control

ITU-T J.83

Annex A/B/C FEC

ATSC FEC

EIA/CEA-909

Interface

BSC Master

Interface

JTAG

Interface

GPIO/GPO

Interface

OOB AFE

PGA

6-bit A/D

AGC Control

VCO

OOB QPSK

Receiver

DVS-167 FEC

DVS-167 FEC

Output

Interface

ATSC 8/16 VSB

Advanced

Receiver

16-1024 QAM

Advanced

Receiver

OOB

Output

Interface