GB20600-2006 Demodulator

Industry Leading Single-Carrier and Multi-Carrier Performance in a Single Chip with Diversity, USB and SDIO and High Doppler Performance

The LGS-8G78 is a highly integrated single-chip China Digital Television Terrestrial Broadcasting System Standard (GB20600-2006) demodulator with diversity feature. This chip combines the analog-to-digital converters, the TDS-OFDM demodulator, the USB2, SDIO interfaces and SDRAM memory for the Time De-Interleaver into a single 144-pin BGA. Designed for single-carrier and multi-carrier mobile digital terrestrial reception of high definition, standard definition and other multimedia-based services at high Doppler speeds, the LGS-8G78 is intended for automotive applications where diversity reception and high vehicular speeds are a requirement. 

The LGS-8G78 single chip demodulator is an attractive solution that can be used with a low power, small foot-print silicon tuner. The chip takes an either analog or digital IQ or IF signal as input, performs the necessary demodulation, FEC (forward error correction) decoding, and provides an MPEG-2 transport stream output in parallel or serial format. With an external tuner, a complete RF-to-MPEG front-end system for GB20600-2006 standard can be implemented with the LGS-8G78 demodulator chip.



■ Basic Characteristics
—— Package: 144 LBGA, 10x10mm
—— Temperature range: -40℃~ +70℃
—— Power supply: 1.2V / 2.5V

■ Applications
—— Automotive with diversity
—— Diversity USB Dongles
—— Laptops, netbooks, notebooks
—— Ultra Mobile PCs (UMPC)
—— Mobile Internet Devices (MID)

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

Product Features                                                                
■ Fully compliant with GB20600-2006 standard
■ Industry leading Single-Carrier and Multi-Carrier performance
■ Diversity feature for automotive applications (> 3dB improvement)
■ 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
■ Reception at high Doppler with vehicular speeds of 250km/h
■ Automatic parameter discovery and update
■ Integrated SDRAM for Time De-interleaver
■ Integrated dual Analog-to-Digital Converter (ADC)
■ USB
■ SDIO
■ Signal input format
—— Analog Intermediate Frequency (IF) or IQ input
—— Digital IF or IQ input
■ Data output format
—— MPEG-2 TS synchronous serial and synchronous parallel output mode
■ Low power operation using advanced power saving and management algorithms
■ Automatic recovery functions
—— Lost signal re-acquisition without external programming
—— Active impulse noise rejection
—— Fast acquisition time
■ Excellent multi-path channel and Doppler performance
■ Excellent Single Frequency Network (SFN) performance
■ Optimized for the best performance in all conditions
—— Impulse noise, echoes, and fading
■ I²C Support
■ Complies with RoHS requirements (Pb-free, Green)

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