STA002 datasheet(1/43 Pages) STMICROELECTRONICS

Il numero della parte	STA002

Spiegazioni elettronici	STARMANO CHANNEL DECODER

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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FRONT_END INTERFACE:

IF input carrier frequency: f = 1.84 MHz

Single internal 6 bit A/D converter

QPSK demodulation

Input symbol frequency: Fs = 1.84 Msymbols/s

Digital Nyquist root filter:

- roll-off value of 0.4

Digital carrier loop:

- on-chip quadrature demodulator and tracking

loop

- lock detector

- C/N indicator

Digital timing recovery:

- internal timing error evaluation, filter and

correction

Digital AGC:

- internal signal power estimation and filter

- output control signal for AGC (1 bit PWM)

FORWARD ERROR CORRECTION:

Inner decoder:

- Viterbi soft decoder for convolutional codes,

constraint length M=7, Rate 1/2

Deinterleaver block

Outer decoder:

- Reed-Solomon decoder for 32 parity bytes;

correction of up to 16 byte errors

- Block lengths: 255

- Energy dispersal descrambler

BACK_END INTERFACE:

Broadcast Channel selection

Audio Service Component selection to MPEG

decoder

Service Component selection

CONTROL:

I

2C serial Bus control interface

DECRYPTION:

WES scheme supported

DESCRIPTION

Designed for World Space satellites digital audio

receivers, the STA002 Digital Receiver Front-end

integrates all the blocks needed to demodulate

incoming digital satellite audio signals from the

tuner: analog to digital converter, QPSK demodu-

lator, signal power estimator, automatic gain con-

trol, Viterbi decoder, deinterleaver, Reed-Solo-

mon decoder and energy dispersal descrabler. Its

advanced error correction functions guarantees a

low error rate even with small low gain receiver

antennas.

Additional functions include the selection of

broadcast channel, service components and

audio components for source decoding:

- The MPEG Audio bitstream is provided at the

serial audio output port.

- The Broadcast Channel is provided to the serial

data output port.

- The Service Component is provided at the SC

output interface.

World Space encryption scheme is supported for

pay programs and paging.

January 2002

®

TQFP44

STA002

STARMAN

™ CHANNEL DECODER

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