BCM3520
®
ATSC/NTSC/QAM DIGITAL CABLE READY DTV RECEIVER
FEATURES
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Integrated VSB/QAM QAMLink
®
receiver
12-bit A/D converter with internal AGC amplifier
Full equalizer architecture spans up to –35 to 49 µs delays
Direct IF sampled architecture reduces system cost
Single IF signal path for QAM/VSB/NTSC to reduce system
costs
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ITU-T J.83 Annex A/B/C FEC modes
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MPEG-2 transport output (serial/parallel)
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All-digital clock and carrier recovery
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Integrated PLLs to minimize external components
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All acquisition times typically less than 50 ms
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QPSK out-of-band receiver
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100–200-MHz receiver LO with input AGC and 6-bit A/D
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Variable symbol rate QPSK receiver
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Digital demodulator, Nyquist filters, tracking loops, and
four-tap adaptive equalizer
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DVS-167 (Davic™)/DVS-178 (DigiCipherII™) FEC decoder
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NTSC/PAL IF Demodulator
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Adjacent channel rejection filters
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Programmable digital audio trap filter
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Programmable group delay compensation filter
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Analog Composite Video Baseband Signal (CVBS) output
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FM demod output supports internal BTSC stereo decoder,
external BTSC stereo decoder (baseband or IF input), or
external Zweiton M decoder
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Integrated acquisition controller
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SUMMARY OF BENEFITS
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Complete DTV single chip receiver solution
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FCC VSB and Digital Cable Ready
•
Superior performance under both static and dynamic multi-
path channel conditions
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Integrated NTSC demodulator
•
BTSC decoder on chip
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Direct interface to CMOS and discrete DTV tuners
Reduces system costs through direct IF sampling
Single IF path for QAM/VSB/NTSC simplifies board design
Smart antenna support
Automatic NTSC co-channel interference and RFI rejection
filters
•
Integrated de-interleaver RAM for VSB FEC, and QAM for
modes up to J=4 reduces system costs
•
Analog stereo, mono, or SAP outputs
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I
2
S or baseband multiplexed audio output
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On-chip stereo audio DACs
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BSC master to control peripherals
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EIA/CEA-909 antenna interface
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144-pin LQFP package
Plug and Play DTV System Solution
Cable
ATSC
BCM3431
LNA
BCM3418
Tuner
MPEG Transport Serial/Parallel
Composite Video
BCM3520
Out-of-Band
VSB/QAM
OOB/CableCard™
Audio: I2S, L/R, Multiplex Baseband, IF Audio
Out-of-band Transport
EIA/CEA-909
Smart Antenna Interface
BOARDCOM [ Broadcom Corporation. ]
