Description
The SDARS is a satellite transmission system based on two geostationary satellites on the East and West coasts of the Continental United States (CONUS). In the urban areas, where the line of sight reception of the satellites is difficult or not possible, the service is covered by terrestrial repeaters adopting a MultiCarrier Modulation scheme. Designed for digital radio receivers compatible with the XMRadio SDARS System, the STA400A Channel Decoder integrates all the functions to demoduTQFP144 ORDERING NUMBER: STA400A THIS DEVICE CAN BE SOLD ONLY TO CUSTOMERS THAT HAVE SIGNED A LICENSE AGREEMENT WITH XM SATELLITE RADIO. XMRADIO SDARS CHANNEL DECODER

Features
■ TWO INTERNAL 10 BIT A/D CONVERTERS
■ TWO QPSK DEMODULATORS FOR SATELLITE BRANCH
■ ONE MULTICARRIER DEMODULATOR FOR TERRESTRIAL BRANCH
■ SATELLITE SYMBOL FREQUENCY: 1.64 MBAUD
■ TERRESTRIAL SYMBOL FREQUENCY: 2.99 MBAUD
■ DIGITAL ROOT RAISED COSINE NYQUIST FILTER: 15% ROLL-OFF
■ FFT LENGTH: 768 SUB-CARRIERS
■ FULL DIGITAL CARRIER AND FREQUENCY RECOVERY AND TRACKING LOOPS
■ FREQUENCY INVERSION COMPENSATION FOR HIGH-SIDE/LOW-SIDE MIXER INJECTION
■ LOCK DETECTORS, C/N INDICATOR, ON CHIP BER ESTIMATORS
■ TWO DIGITAL AGCs: INTERNAL SIGNAL POWER ESTIMATION AND FILTERING
■ 1 BIT PDM AGCs CONTROL SIGNAL OUTPUTS TDM DECODING AND MANAGEMENT
■ SATELLITE AND TERRESTRIAL FRAME SYNCHRONIZATION
■ SATELLITE PHASE AMBIGUITY RESOLUTION
■ TDM DEMULTIPLEXING
■ PRIME RATE CHANNEL (PRC) DEMULTIPLEXING
■ EXTERNAL MEMORY CONTROLLING FORWARD ERROR CORRECTION
■ VITERBI DECODER: K=7, R=1/3
■ SATELLITE DEPUNCTURING: RATE 3/4
■ TERRESTRIAL DEPUNCTURING: RATE 3/5
■ CONVOLUTIONAL TIME DEINTERLEAVER OVER 4.7 SEC
■ BLOCK DEINTERLEAVER OVER 2 RS BLOCKS
■ REED-SOLOMON DECODER: (255,223). UP TO 16 BYTES CORRECTION CAPABILITY.
■ ENERGY DISPERSAL DESCRAMBLER
■ SAT-SAT AND TERR-SAT DIVERSITY COMBINING BACK END INTERFACE
■ TWO PAYLOAD CHANNEL BITSTREAM INTERFACES
■ PAYLOAD CHANNEL SELECTION LOGIC
■ DESIGNED TO WORK WITH THE STA450A SERVICE AND SOURCE DECODER LOW POWER TECHNOLOGY
■ 1.8V, 0.18µm TECHNOLOGY
■ 3.3V CAPABLE I/Os CONTROL
■ IIC-BUS SLAVE CONTROL INTERFACE
■ DEVICE ADDRESS: 1101010