GB20600-2006 Demodulator

The LGS-8G42 is a single chip demodulator fully compliant with the China Digital Television Terrestrial Broadcasting System Standard (GB20600-2006).  It uses TDS-OFDM (Time Domain Synchronous - Orthogonal Frequency Division Multiplexing), a core technology on which GB20600-2006 is based. Designed for digital terrestrial reception of high definition, standard definition and other multimedia-based services, the demodulator is intended for indoor, outdoor, fixed, portable, and automotive applications. It is ideal for use with integrated Digital Television (iDTV) and set-top-box (STB) applications.

The chip takes analog or digital IF signal as input and converts this signal into baseband.  It then performs the necessary demodulation and FEC (forward error correction) decoding, and provides an MPEG-2 transport stream output in parallel or serial format. With an external time de-interleaver SDRAM, a complete RF to MPEG front-end system that is fully compliant with GB20600-2006 can be implemented with the LGS-8G42 chip.

 

■ Basic Characteristics
  — Package: 144 LQFP, 20x20mm
  — Temperature range: -40℃ ~ +70℃
  — Power supply: 1.2V / 2.5V
  — Process: 0.13μm CMOS
  — Power consumption:< 280 mW

■ Applications
  — Integrated Digital TVs
  — Set-top-boxes
  — Automobile receivers

■ Development Support
  — Samples
  — Complete Documentation
  — Schematics
  — Evaluation board and software

Product Features
■ Fully compliant with GB20600-2006 standard
■ Supports 4QAM-NR, 4QAM, 16QAM, 32QAM, 64QAM modulations
■ Forward Error Correction (FEC) Rate: 0.4, 0.6, 0.8
■ Guard Interval: PN420, PN595, PN945
■ Time De-Interleaver: M=240 or M=720
■ Automatic parameters discovery and update
■ Integrated Analog-to-Digital Converter (ADC)
■ Signal input format
     —— Analog Intermediate Frequency (IF) input
     —— Digital Intermediate Frequency (IF) input
■ Data output format
     —— MPEG-2 TS (Transport Stream) Synchronous Parallel Interface (SPI)
     —— Synchronous serial and synchronous parallel output mode
■ Automatic recovery functions
     —— Lost signal re-acquisition without external programming
     —— Active impulse noise rejection
     —— Fast acquisition time
■ Power consumption
     —— Normal operation mode: < 280mW
■ Excellent multipath channel performance
■ Excellent Single Frequency Network (SFN) performance
■ Optimized for the best performance in all conditions
     —— Impulse noise, echoes, and fading
■ Full I²C Support
■ Complies with RoHS requirements (Pb-free, Green)

Simplified Hardware Design
■ Support for digital IF and analog IF signal input from tuners
■ Standard I²C bus control for the system and demodulator
■ MPEG-TS interface to connect with MPEG decoder chips and media processor