The Cascade2 is a multistandard demodulator and decoder for
terrestrial and cable TV reception. The small, high-performance Cascade2 is well suited for any system designed to receive off-air and cable digital TV transmissions. This includes stand-alone SDTV or HDTV sets, Set-Top Boxes, PC-TV cards and data reception appliances.
Description
Cascade2 is designed to support 8/16-VSB in compliance with the ATSC Digital Television Standard as well as OpenCable ITU-T J.83B in compliant 256/64 QAM and OOB QPSK modes for Digital Cable Ready downstream reception.
The Cascade2 is designed to reduce system costs by integrating the FAT channel demodulation of VSB, J.83 Annex B QAM and Audio decoding (for analog channels) and the FDC QPSK channel demodulation.
The Cascade2 family ICs are produced in several combinations of reception standards:
| Cascade2 P/N | Decscription | ATSC | QAM Annex B | OOB FDC | US Audio BTSC | Korea Audio A2FM | FM Radio | Smart Antenna |
|---|
| CAS-220 | VSB | • | | | | | | • |
| CAS-220/C | VSB, QAM | • | • | | | | | • |
| CAS-220/S | VSB, BTSC | • | | | • | • | • | • |
| CAS-220/CS | VSB, QAM, BTSC | • | • | | • | • | • | • |
| CAS-220/CO | VSB, QAM, OOB | • | • | • | | | | • |
| CAS-220/CSO | VSB, QAM, BTSC,OOB | • | • | • | • | • | • | • |
Key Features
Modulation Flexibility
ATSC 8-VSB demodulation
OpenCable, ANSI/SCTE DVS-031, ITU-T J.83 Annex B and DOCSIS compliant 64/256 QAM demodulation
OOB downstream demodulation, complies with SCTE DVS-178 and DVS-167 specifications
Audio stereo decoding: US BTSC audio mono, stereo and SAP decoding (DBX), Korea A2 FM mono, stereo and bilingual, with IIS output
Autonomous operation Internal DSP firmware execution eliminates the need for supervision and operation by the system host
Excellent VSB Performance
Superior 8-VSB multi-path performance with equalizer coverage of –34us to +78us.
Superior VSB indoor reception using enhanced equalization and synchronization algorithms, based on training signal and data-aided equalization, enables Brazil and other 0dB ghosts reception
Adaptive control loops according to channel conditions for fast channel acquisition and optimal tracking
Excellent doppler ghosts rejection
Fast channel auto search by carrier lock of +/-400KHz and NTSC channel detection
Excellent QAM Performance
ANSI/SCTE DVS-031, ITU-T J.83 Annex B 64/256QAM, 5.059641/5.360537MHz symbol rate.
Integrated 32Kbytes deinterleaver RAM for DI modes up to I=128 J=4.
84 taps equalization range: 36 FFE and 48 DFE for superior cable micro-reflection rejection
Superior phase noise rejection
Superior burst noise and combined distortion rejection
Superior AM noise rejection
Fast channel auto search based on auto 64/256QAM detection and wide carrier acquisition range of +/-500KHz
FDC Demodulator (OOB)
OpenCable SCTE DVS-178 & 167 QPSK demodulation
8 taps adaptive equalizer
On-chip frequency synthesizer provides LO for FDC down-conversion
Direct Cable Card interface compliant with SCTE 28 2001 (DVS-295)
Sound stereo decoder
US BTSC mono, stereo and SAP (DBX) decoding
Korea A2 FM mono, stereo and bilingual decoding
FM radio stereo decoding
IIS server/client with output clock of 48KHz, 44.1KHz, and 32KHz
Advanced System Functions
Accepts 44MHz or low-IF from the tuner eliminating external base-band demodulation
Separate RF and IF AGC PWM outputs
Parallel and serial MPEG2 transport outputs
All digital recovery loops
Firmware loading IIC serial bus from host upon initialization
Integrated IIC switch for isolation of the tuner IIC port during normal reception modes
Via IIC, the Cascade2 reports FEC statistics, receiver status, and channel data such as S/N ratio, equalizer taps, carrier offset, and more
EIA/CEA-909 Mode A Smart Antenna Interface
Internal mux for serial output of decrypted TS from POD
Standard 14x14 mm 100pin LQFP package
