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STV0196 Datasheet

  • STV0196

  • QPSK/BPSK DEMODULATOR AND FEC IC

  • 237.35KB

  • 23頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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STV0196B
QPSK/BPSK DEMODULATOR AND FEC IC
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FRONT-END INTERFACE
I AND Q 6 BITS DIGITAL INPUTS AT 2Fs
QPSK DEMODULATION (Two Modes : A and B)
INPUT SYMBOL FREQUENCY (Fs) UP TO
30MSYMBOLS/S
DIGITAL NYQUIST ROOT FILTER :
ROLL-OFF VALUE OF 0.35 IN MODE A
DIGITAL CARRIER LOOP :
- ON-CHIP DEROTATOR AND TRACKING
LOOP
- CARRIER OFFSET INDICATOR
- LOCK DETECTOR
- C/N INDICATOR FOR DISH POSITIONING
DIGITAL TIMING RECOVERY :
- INTERNAL TIMING ERROR EVALUATION
AND FILTER
- OUTPUT CONTROL SIGNAL FOR A 2Fs
EXTERNAL VCO OR VCXO
DIGITAL AGC :
- INTERNAL SIGNAL POWER ESTIMATION
AND FILTER
- OUTPUT CONTROL SIGNAL FOR AGC
(1 BIT PULSE DENSITY MODULATION)
DESCRIPTION
Designed for the fast growing direct broadcast
satellite (DBS) digital TV receiver market,
the SGS-THOMSON STV0196B Digital Satellite
Receiver Front-end integrates all the functions
needed to demodulate incoming digital satellite TV
signals from the tuner : Nyquist filters, QPSK/BPSK
demodulator, signal power estimator, automatic
gain control, Viterbi decoder, deinterleaver, Reed-
Solomon decoder and energy dispersal descram-
bler. This high level of integration greatly reduces
the package count and cost of a set top box. The
demodulator blocks are suitable for a wide range
of symbol rates while the advanced error correction
functions guaranteea low error rate even with small
receiver antennas or low power transmitters.
The STV0196B has multistandard capability.
It is fully compliant with the recently defined Digital
Video Broadcasting (DVB) standard (already
adopted by satellite TV operators in the USA,
Europe and Asia) and also compatible with the
main consumer digital satellite TV standards in use.
FORWARD ERROR CORRECTION
INNER DECODER :
- VITERBI SOFT DECODER FOR CONVOLU-
TIONAL CODES, CONSTRAINT LENGTH
M = 7, RATE 1/2
- PUNCTURED CODES 1/2, 2/3, 3/4, 5/6 AND
7/8 IN MODE A
- AUTOMATIC OR MANUAL RATE AND
PHASE RECOGNITION
DEINTERLEAVER :
- WORD SYNCHRO EXTRACTION
- CONVOLUTIVE DEINTERLEAVER
OUTER DECODER :
- IN MODE A : REED-SOLOMON DECODER
FOR 16 PARITY BYTES ; CORRECTION OF
UP TO 8 BYTE ERRORS
- BLOCK LENGTHS : 204 IN MODE A
- ENERGY DISPERSAL DESCRAMBLER
PQFP64
(Plastic Package)
ORDER CODE :
STV0196B
CONTROL
I
2
C SERIAL BUS
September 1996
1/23

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