STV0196 datasheet(1/23 Pages) STMICROELECTRONICS

部件名	STV0196

功能描述	QPSK/BPSK DEMODULATOR AND FEC IC

PDF	23 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 23 page

STV0196B

QPSK/BPSK DEMODULATOR AND FEC IC

September 1996

PQFP64

(Plastic Package)

ORDER CODE : STV0196B

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)

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

CONTROL

.

I

2C SERIAL BUS

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 guarantee a 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.

1/23

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