OR51122

OR51122 Demodulator Preliminary Information January 2003 The OR51122 is a sophisticated DSP-based demodulator IC. The OR51122 demodulates and decodes ATSC VSB and analog NTSC TV transmission. OR51122 Simplified Block Diagram RF Tuner The OR51122 builds on Oren’s powerful and efficient demodulator DSP technology and adaptable filter blocks controlled by a central DSP processor, adding accelerated 8-VSB for ATSC demodulation. The OR51122 also processes NTSC video signal and translates the incoming signal to baseband output. BTSC audio is demodulated and decoded. This proprietary implementation results in many application benefits: Superior Modulation Flexibility VSB ATSC demodulation NTSC video demodulation baseband output BTSC audio decoder Ideal for iDTVs, set-tops, and PC products Excellent VSB Performance Superior VSB multi-path, adjacent channel rejection with adjustable -15 to +45 µs coverage by 576-tap full equalizer Handles large carrier offset (+/-500khz) using the imbedded search algorithm Fast channel acquisition and recover algorithms, with both blind and trained equalization Dynamically programmable matched filters compensate for carrier frequency offset, and adjacent channel interference Comprehensive FEC Integration Reed-Solomon decoder Soft Viterbi decoder Autonomous Operation Internal firmware execution eliminates supervision and operation by the system host Internal DSP controls all aspects of operation including filter training a...