OR51122 Datasheet PDF - Oren Semiconductor


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OR51122
Oren Semiconductor

Part Number OR51122
Description Demodulator
Page 2 Pages

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Preliminary Information
OR51122
Demodulator
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
omRF
AGC
IF
AGC
AUDIO
AGC
.cNTSC Audio
OR51122
10-bit
ADC
Programmable Digital
Filters and other
DSP Blocks
NCO
AGC DSP Processor
FEC
Circuits
Firmware
RAM
10-bit
ADC
NTSC Audio Core
NTSC baseband video
MPEG-2 Transport Stream
(Parallel or Serial Format)
SPI or ROM Interface
IIC Host Interface
General Purpose I/O Pins
IIS Output
t4UThe 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
eapplication benefits:
heSuperior Modulation Flexibility
• VSB ATSC demodulation
S• NTSC video demodulation baseband output
• BTSC audio decoder
• Ideal for iDTVs, set-tops, and PC products
taExcellent VSB Performance
• Superior VSB multi-path, adjacent channel rejection with
aadjustable -15 to +45 µs coverage by 576-tap full equalizer
• Handles large carrier offset (+/-500khz) using the
imbedded search algorithm
.D• 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
wComprehensive FEC Integration
• Reed-Solomon decoder
w• Soft Viterbi decoder
mAutonomous Operation
w o• Internal firmware execution eliminates supervision and
.coperation by the system host
• Internal DSP controls all aspects of operation including
Ufilter training and re-acquisition
t4• 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
www.DataSheeOren Semiconductor, Inc. 2700 Augustine Drive, Suite 155, Santa Clara, CA 95054 tel: 408.330.0300 fax: 408.330.0305
www.oren.com
rev. 0.7



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OR51122
Demodulator
GENERAL DESCRIPTION
The OR51122 is multi-standard demodulator and decoder for terrestrial and analog TV reception. It is
designed to support 8/16-VSB in full compliance with ATSC Digital Television Standard. Its basic function is
to recover the digital data encoded into the broadcast signal, which includes video and audio program
information and ancillary data service. The device outputs the demodulated data as a standard MPEG-2
transport stream in either parallel or serial format.
The OR51122 is designed to reduce system cost by using a single tuner for DTV and the analog NTSC
transmission. The OR51122 demodulates video and audio in NTSC channels.
A typical OR51122 system application is shown in Figure 1. The device directly accepts analog IF or low IF
from the tuner section via an internal ADC (Analog to Digital Converter). Following demodulation and error
correction, it provides the MPEG-2 transport stream to the transport demultiplexer. For the analog channels
the OR51122 provides sampled CVBS video and IIS audio.
The OR51122 small size and low power make it well suited for any system designed to receive information
from DTV to NTSC broadcasts. This includes stand-alone SDTV or HDTV sets, STB's, PC-TV cards or data
reception appliances.
Figure 1: Application of the OR51122 in Typical Legacy/Digital TV Receiver
Terrestrial
Antenna
Terrestrial
Tuner
Section
44MHz
OR51122
composite legacy Video
Compressed
Video
MPEG-2
Transport
Bit Stream
Transport
Decoder
and
Demux
Control / Data
Compressed
Audio
Program
Code ROM
(Optional)
System
Microcontroller
IIS audio
Video
Decoder
Data and
Control
Interface
Audio
Decoder
To Video
Display
User
Interface
To Audio
Subsystem
07/01/03
2
rev. 0.7




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