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MT312C/CG Datasheet(PDF) 1 Page - Zarlink Semiconductor Inc |
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MT312C/CG Datasheet(HTML) 1 Page - Zarlink Semiconductor Inc |
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1 / 90 page  1 MT312 Satellite Channel Decoder Design Manual DM5651 ISSUE 1.2 January 2002 Ordering Information MT312C/CG/GP1N The MT312 is a QPSK/BPSK 1 to 45MBaud demodulator and channel decoder for digital satellite television transmissions to the European Broadcast Union ETS 300 421 specification (ref. 1). It receives analogue I and Q signals from the tuner, digitises and digitally demodulates this signal, and implements the complete DVB/DSS FEC (Forward Error Correction), and de-scrambling function. The output is in the form of MPEG2 or DSS transport stream data packets. An external MPEG clock input is provided for synchronisation to MPEG decoders and DVB Common Interface Modules. The MT312 also provides automatic gain control to the RF front- end devices. The MT312 has a serial 2-wire bus interface to the control microprocessor. Minimal software is required to control the MT312 because of the built in automatic search and decode control functions. Figure 1 - System Block Diagram - SNIM5 Key Features • Conforms to EBU specification for DVB-S and DirecTV specification for DSS. • On-chip digital filtering supports 1 to 45MBaud Symbol rates. • On-chip 6-bit 60 or 90MHz dual-ADC. • High speed scanning mode for blind symbol rate/code rate acquisition. • Automatic IQ phase resolution. • No signal indicator. • Up to ±15MHz LNB frequency tracking. • Fully digital timing and phase recovery loops. • High level software interface for minimum development time. • DiSEqC™ v2.2: receive/transmit for full control of LNB and dish. Applications • DVB 1 to 45MBaud compliant satellite receivers. • DSS 20MBaud compliant satellite receivers. • SCPC receivers. (Single Channel Per Carrier) • SMATV trans-modulators. (Single Master Antenna TV) • LMDS (Local Multipoint Distribution Service) • Satellite PC applications. I Q 2-wire bus control Synthesiser SP5769 Tank 2-wire bus control Transport stream O/P Channel Decoder MT312 Low pass Filter Direct Conversion Tuner SL1925 AGC AMP SL1914 AGC control I I/P Q I/P RF I/P Supersedes DS5347 Issue 1.2 November 2001 |
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