BCM4500 Просмотр технического описания (PDF) - Broadcom Corporation

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BCM4500

ADVANCED MODULATION SATELLITE RECEIVER

Broadcom Corporation 

BCM4500

®

ADVANCED MODULATION SATELLITE RECEIVER

FEATURES

SUMMARY OF BENEFITS

• All-digital satellite receiver

- 256-kilobaud to 30-megabaud variable rate receiver

- Supports BPSK, QPSK, 8PSK, & 16QAM modulation

- Dual integrated 7-bit A/D converters

- Digital square-root Nyquist filters (a=0.2, 0.35)

- All-digital clock and carrier recovery

- 12-tap adaptive equalizer

• Advanced modulation turbo FEC decoder

- High performance decoder approaches constrained capacity

theoretical limits

- Supports QPSK rates 1/4, 1/2 and 3/4

- 8PSK flexible code rate support including 2/3, 3/4, 5/6 and 8/9

- Supports 16QAM rate 3/4

- No external RAM support required

- Reed-Solomon decoder; t=10

• Complies with DVB/DIRECTV®/Digicipher IITM FEC decoder

• MPEG-2 or DIRECTV® output interface with output clock PLL

• On-chip microcontroller for acquisition and tracking

• On-chip BERT for BER testing

• Integrated DiSEqCTM (v2.0) transmitter and receiver

• 128-pin PQFP

• 3.3V I/O and analog operation

• 1.8V digital operation

• Highly integrated solution provides universal frontend for

advanced modulation satellite systems and legacy QPSK

systems in a single package.

• High-performance turbo code FEC enables 50% throughput

increase over existing satellite channels within current link

budgets within a single transponder.

• Advanced design architecture requires no external RAM for

turbo FEC.

• Advanced modulation receiver maintains robust performance

during low SNR operation.

• Full variable rate operation from 256-kilobaud to 30-

megabaud provides multiple operating points for optimal

system deployment.

• Integrated microcontroller controls receiver operations

including configuration, acquisition and performance

monitoring.

• Host interface operates via high-level application program

interface (API) to reduce host software development time and

to simplify system integration.

• MPEG-2 or DIRECTV® output interface with PLL-generated

data clock provides glueless integration with BCM7020 HD

graphics and video subsystem.

• Highly integrated DiSEqCTM interface includes integrated

analog components.

Advanced Modulation Satellite Receiver Set-Top Box

Memory

Conditional

Access

L-band

BCM3440

SatelliteTuner

BCM4500

Advanced Modulation

Satellite Receiver

BCM7020

HDTV MPEG-2

Transport DEMUX,

Audio/ Video

Decoder and

Display Engine

HD Video

Audio

Host CPU

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