Preliminary Information
OR51122
Demodulator
Company Confidential
February 2002
Oren Semiconductor, Inc.
2700 Augustine Drive, Suite 155, Santa Clara, CA 95054 tel: 408.330.0300 fax: 408.330.0305
www.oren.com
rev.
0.6
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
The OR51122 builds on Oren's powerful and efficient demodulator DSP technology, 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. Unlike competitive solutions that use inflexible pipe-line signal processing circuitry, Oren uses adaptable filter blocks
controlled by a central DSP processor. 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 -6 to +44
s coverage by 576-tap full equalizer
(not sparse tap)
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 and re-acquisition
Automatic adjustments are made for impairments like
NTSC interference and phase noise
Low Power
Power dissipation is less than 0.9 Watt using 3.3V
peripheral, and 1.8V core supplies
Standard 128-pin QFP package
Advanced System Functions
Accepts 44MHz or low-IF from the tuner eliminating
external base-band demodulation
Separate RF and IF AGC outputs with adaptive tuner
gain delay and loop parameters
Fast channel re-lock through restoration of channel
parameters
Internal NCO clock source eliminates external VCXO
requirements
Via IIC, the OR51122 independently calculates and
reports FEC statistics, receiver status, and channel data
such as S/N ratio, equalizer taps, carrier offset, and
more.
Flexible Firmware Initialization Options
Three firmware loading options:
- IIC serial bus from host
- Auto-boot from SPI memory chip
- Auto-boot from ROM interface
Approximately 20kB firmware space
OR51122
Programmable Digital
Filters, FFT, and other
DSP Blocks
DSP Processor
RF
Tuner
NCO
Firmware
RAM
FEC
Circuits
AGC
IIC Host Interface
General Purpose I/O Pins
SPI or ROM Interface
MPEG-2 Transport Stream
(Parallel or Serial Format)
10-bit
ADC
RF
AGC
IF
AGC
10-bit
ADC
NTSC Audio Core
IIS Output
NTSC Audio
AUDIO
AGC
NTSC baseband video
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