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| DIGITAL TV AND MULTIMEDIA PRODUCTS AT76C651B INTEGRATED DVB(R)/DAVICTM-COMPLIANT QAM DEMODULATOR Less than 0.5 dB degradation with respect to theoretical 256-QAM Faster than 10 ms locking time Robust against signal loss Widely applicable for cable television, multipoint distribution systems (MMDS) and cable modems Int Ne e w hig grate ! h-b d 1 0-b an AD dwid it th C l l l l l DAVIC/DVB/ETS300.429/ITU-T J.83 annex A, C fully compliant 1024, 512, 256, 128, 64, 32, 16QAM and QPSK demodulation Variable symbol rate recovery Fully digital carrier recovery (coherent or differential for QPSK) Selectable transversal or decision feedback 32-tap equalizer Bit error rate and packet error rate monitoring Signal-to-noise ratio estimation Residual phase noise estimation Advanced CMOS technology, 3.3V operation Image: Studio Cadrage l l l l R AT76C651B HIGH-PERFORMANCE, LOW-COST INTEGRATED SOLUTION Atmel France Digital TV Development Center Orlytech / Bat. 526 2, allee Maryse Bastie 91781 Wissous Cedex France Tel : (+33)(0)1 70 03 30 05 Fax : (+33)(0)1 70 03 30 13 Corporate Headquarters 2325 Orchard Parkway San Jose, CA 95131 USA Tel : (+1)(408) 441-0311 Fax : (+1)(408) 436 4200 Europe Atmel SarL Route des Arsenaux 41 Casa Postale 80 CH-1705 Fribourg Switzerland Tel: (+41) 26-426-5555 Fax: (+41) 26-426-5500 Asia Atmel Asia Ltd Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East, Kowloon Hong Kong Tel : (+852) 272 19 778 Fax : (+852) 272 21 369 Japan Atmel Japan KK Tonetsu Shinkawa Bldg, 9F 1-24-8 Shinkawa Chuo-Ku, Tokyo 104-0033 Japan Tel : (+81) 3 3523 3551 Fax : (+81) 3 3523 7581 E-mail literature@atmel.com Web Site http://www.atmel.com 1,00E+00 Atmel's AT76C651B QAM Demodulator brings the benefits of state-of-the-art digital signal processing to a series of applications for multimedia, TV, Internet access and PC high-speed data exchange. With less than 0.5 dB degradation with respect to theoretical 256-QAM, the AT76C651B enables cable operators to deploy set-top boxes on their network using 256-QAM modulation. This offers up to 56M bits/sec of television and data per TV channel, thus adding 3 to 4 additional TV programs for each channel. Also, with a particularly short locking time, the user can switch from one channel to another with no noticeable delay. Finally, interactive broadcasting will no longer suffer from a lack of bandwidth. High-performance Low-cost Integrated Integration into a Set-top Box or Cable Solution Modem The AT76C651B is designed for highThe AT76C651B is positioned in the performance low-cost set-top boxes and front end of a set-top box or cable cable modems for European, American modem immediately after the tuner and and Asian CATV and MMDS (Microwave the amplification chain. The outgoing Multipoint Distribution System) standards. MPEG2 Transport Stream is sent to the In addition to its strict implementation of MPEG2 processor and descrambler for the DVB and DAVIC standards, the video/audio processing. following functions give the AT76C651 the highest Low-cost performance on the market tuner without additional costs: Dual Automatic Gain Control (AGC) for protection against noise from adjacent digital and analog channels Variable bandwidth filtering and interpolation offering virtually no degradation at any symbol rate Dual DDS carrier frequency/phase recovery for large frequency offsets 32-tap dual-structure equalizer offering up to 5.2 s echo compensation AT76C651B QAM DEMODULATO R SAW - AGC Common interface to MPEG2 processor Crystal AT76C651B Block Diagram Evaluation Kit with Windows Software Environment The AT76C651B Evaluation Kit consists of an evaluation board that enables a user to rapidly evaluate the performance of the component in a real environment. Any QAM modulation source (QAM modulator, CATV network, MMDS network) can be connected to the board. A PC software monitor shows all the parameters that can be traced (AGC level, frequency offset, bit error rate, C/N true measurement, phase noise true measurement), as well as the received constellation or the equalizer echo compensation. The board combined with the software is the perfect tool for a live demonstration to cable operators. - Bit Error Rate Performance The bit error rate measured with the AT76C651B shows virtually no degradation in 64-QAM and only 0.5 dB in 256-QAM. 64-QAM 1,00E-01 64-QAM real 256-QAM 256-QAM real 1,00E-02 1,00E-03 1,00E-04 R 1,00E-05 (c) Atmel Corporation 2000 1,00E-06 1,00E-07 Atmel and the Atmel logo are registered trademarks of Atmel Corporation. Other terms and product names may be trademarks of others. All figures in this brochure are for illustrative purposes only. See Atmel data books for definitive figures and for applicable limitations and warranties. 1398A-09/00/12M 1,00E-08 22 23 24 25 26 27 28 C/N (dB) 29 30 31 32 33 34 Bit Error Rate Performance AT76C651B Development Software |
Price & Availability of AT76C651BNBSP
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