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BCM94500 Fiches technique(PDF) 2 Page - Broadcom Corporation. |
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BCM94500 Fiches technique(HTML) 2 Page - Broadcom Corporation. |
2 / 2 page The BCM94500 advanced modulation satellite receiver evaluation system is intended for use by satellite systems engineers for the evaluation of the high performance offered by the BCM4500 advanced modulation satellite receiver with turbo code FEC. It is also intended for use by hardware designers and software developers to reduce product design and development time. This evaluation platform provides the ideal environment for systems engineers to explore the emerging technology enabled by turbo code FECs and the unparalleled performance offered by the BCM4500. The simplified user interface gives engineers easy access to various system parameters, allowing them to select optimal settings for the BCM4500 to match the link budget requirements. Hardware engineers and software developers can use the BCM94500 as a baseline for the final product architecture and also use it as a test and measurement device to verify their final product performance. The BCM94500 supports QPSK, 8PSK and 16 QAM operation with turbo code FEC over a range of coding and symbol rates. The system also supports DVB-S and DIRECTV® modes for legacy system compatibility testing. The BCM94500 contains the BCM3440 direct conversion CMOS satellite tuner, which supports the full 950–2150 MHz operating range. Baseband IQ outputs are connected directly to the BCM4500 receiver. All tuner AGC loops are controlled by the BCM4500. The BCM4500 process the I/Q baseband signal through a variable rate advanced modulation receiver and can use either the turbo code FEC or legacy DVB-S/ DIRECTV FEC. The MPEG-2, DIRECTV- or DVB-compliant output is available on a 25-pin connector, driven by line drivers for connection to external test equipment or for interfacing to the BCM97031 HDTV video/graphics subsystem for decoding and display. Additional on-board components are provided as an interface between the BCM4500 DiSEqCTM controller and external devices, such as multiple switches. The BCM94500 is delivered with Windows® software for easy installation and testing. The host software communicates with the BCM94500 via I2C protocol via the PC parallel port. The host software contains several screens for chip configuration, constellation monitoring, and performance monitoring including SNR, block error calculations and other FEC performance parameters. Testing is simplified by having the option to use other external BERTs or the BCM4500 on-chip BERT. A detailed user manual is provided that describes the host software interface as well as the operation of the BCM4500 API for embedded host software development. All acquisition scripts and monitoring calculations are performed in the BCM4500 internal microcontroller and are transparent to the host. The BCM94500 package is delivered with the user manual, schematic drawings, and a bill of materials. PCB Gerber files are also available. BCM94500 OVER VIEW RA_I RA_Q A/D A/D 7 7 Phase/ Frequency Recovery Variable Rate Demod Acquisition/Tracking Loops and Clock Generation AGC_CTRL Nyquist α=0.20,0.35 Nyquist α=0.20,0.35 12-tap FFE Block Header Processor Iterative Decoder Outer RS Decoder t=10 M U X Viterbi Decoder Sync & Deinter- leaver RS Decoder Acquisition Microcontroller MBus/SPI Interface DATA[7:0] CLK VALID SYNC ERR MICRO[4:0] DiSEqC 2.0 DISEQC BCM4500 Block Diagram ® Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com Broadcom®, the pulse logo® and Connecting EverythingTM are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. DIRECTV® is a registered trademark of DIRECTV, INC., a unit of Hughes Electronics Corporation. Windows® is a trademark of Microsoft Corporation. DiSEqCTM is a trademark of EUTELSAT. All other trademarks 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. 94500-PB04-R-06.25.03 |
Numéro de pièce similaire - BCM94500 |
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Description similaire - BCM94500 |
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