GX1121……QPSK+8PSK+LDPC（ABS-S）

Product description：
GX1121 is a single-chip channel receiver for satellite television reception, which conforms to Chinese ABS-S (Advanced Broadcasting System - Satellite) standard. With patented technologies, GX1121 provides outstanding performance in anti-echo interference, low receiving threshold and power consumption, which helps set-top-box (STB) manufacturers to reduce the development, production and maintenance expenses of STB and is the first choice for digital STB and tuner manufacturers.
Features：
· QPSK/8PSK demodulator and LDPC conform to ABS-S standard
· Supports the following LDPC rate:
　QPSK 1/4, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 13/15, 9/10
　8PSK 3/5, 2/3, 3/4, 5/6, 13/15, 9/10
· All Roll-off factors(0.35/0.25/0.20) defined by ABS-S supported
· Wide symbol rate support: 0.5MBaud～60.0MBaud
· High performance Equalizer, canceling echo introduced by analog front end
· Integrated High performance dual-10-bit ADC.
· IQ imbalance compensator
· Full digital demodulator
· Integrates advanced software interfaces for control
· Robust signal quality indication, simplifies satellite antenna adjust
· Exterior interfaces
　AGC output interface in PDM mode
　Programmable parallel TS output interface
　Serial 2-wire bus interface and repeater
　Integrated PLL using external low cost passive crystal
　DiSEqCTM v2.2 modulation output for full control of LNB and satellite antenna.
· Others
　Voltage：3.3V(I/O)，1.2V(Core)
　Power consumption：<850mW
　Typical power consumption ：<200mW
　Package：100LQFP 　　
Application field：
· China direct broadcast satellite DTV STB
· China direct broadcast satellite tuner
· China direct broadcast satellite receivers
Solution：

PCB：