STA002 Datasheet, PDF (1/43 Pages) STMicroelectronics – STARMANO CHANNEL DECODER

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STA002
STARMAN™ CHANNEL DECODER
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:
I²C serial Bus control interface
TQFP44
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
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