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BCM3250 Datasheet

  • BCM3250

  • QAMLINK ADVANCED SER-TOP BOX SINGLE-CHIP FRONT-END

  • 2頁(yè)

  • ETC

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BCM3250
廬
BCM3250 QAMLINK
廬
ADVANCED SET-TOP BOX SINGLE-CHIP FRONT-END
FEATURES
SUMMARY OF BENEFITS
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Two complete QAMLink variable symbol rate receivers (in-
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Direct interface to VoIP DSP
band video and DOCSIS/EuroDOCSIS IP data receive
channels)
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Dual 10-bit A/D converters with input AGC amplifiers
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Dual 1-7 Mbaud 256-QAM receivers
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Dual ITU-T J.83 Annex A/B/C compatible FEC decoders
QPSK out-of-band receiver
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100 鈥?200 MHz LO with AGC and 6-bit A/D converter
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DigiCipher II廬/DVB/DAVIC FEC decoder
Upstream QPSK/16-QAM transmitter
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0 鈥?65 MHz direct RF output
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Programmable Starvue II/DOCSIS/EuroDOCSIS/DVB/DAVIC
FEC encoder
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10-bit D/A converter with output power control interfaces
DOCSIS/EuroDOCSIS media access controller (MAC)
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DOCSIS/EuroDOCSIS version 1.1 based
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Extensions for fragmentation and concatenation
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Support for enhanced Quality of Service (QoS) for Voice over
IP (VoIP) applications
DAVIC media access controller (MAC)
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DAVIC 1.2/1.5 compliant
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Support for 1.5 Mbps and 3 Mbps on both upstream and
downstream
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Parsing, CRC, and ATM cell extraction
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Hardware SAR engine
Both processor interface and PCI 2.2
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Represents a complete solution for interactive set-top box
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front-end, including cable modem functions.
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Universal front-end supports the ITU-T J.83 Annex A/B/C as
well as OpenCable, DOCSIS/EuroDOCSIS and DVB/DAVIC.
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DOCSIS/EuroDOCSIS 1.1-based media access controller
(MAC) supports Voice over IP and high-speed Internet access
capability.
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DAVIC 1.2/1.5 MAC supports conditional access systems and
lower data rate services.
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BCM3250, together with BCM7020/BCM7030 Video Decoder
and Graphics Engine, provide a two-chipset solution for
OpenCable applications.
Includes second in-band channel pass through for picture-in-
picture functionality and multiple camera angles.
Integration of all analog functions leads to lower system cost
and improved performance.
Single upstream transmitter is shared between modem and
upstream interactive video commands, eliminating the need
for a second upstream channel.
Integrated peripheral control unit supports required set-top
box peripherals without additional external devices.
Interactive Set-Top Box System Block Diagram
Analog V
ideo
Cable
Plant
Dual
Tuner
with
Diplex
Filter
IP Data Channel
Video Channel
Out-of-Band Channel
BCM3250
QAMLink
廬
Advanced
Set-top Box
Single-Chip
Front-End
BCM7038 Dual HD decoder
MIPS64 microprocessor
Transport/Graphics Subsystem
Peripherals
Video O
ut
Audio O
ut
Upstream T
ransmitter
CPU
V.90 S
oft
Modem
Codec
I/O

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