ST STV0903 User Manual
for satellite digital TV and data services set-top boxes
Features
■ Demodulation
–DIRECTV
– DVBS2 QPSK and 8PSK
– Digital Nyquist root filter with 0.20, 0.25,
0.35 excess bandwidth factors
■ Decoding
– Up to 95 mega channel bits per second
(Mcbps) at input to DVBS2 FEC
– Up to 130 Mcbps DVBS or DIRECTV
input to legacy FEC
■ Interfaces
– Dedicated 27 MHz clock generation for
back-end decoder
2
–I
C serial bus interface
– JTAG interface - boundary scan
TM
and DVBS QPSK
STV0903
Multi-standard advanced demodulator
Data Brief
TM
2.x interface
2
C serial interface
TM
legacy and DVBS2 (QPSK and
TM
–DiSEqC
– GPIOs and interrupt lines
– Monitoring through I
– FSK modem
■ Technology
– 90 nm CMOS process
– Power saving features
■ Package
– LQFP-128-EP 14x14, 0.4 mm pitch, RoHS.
at
Description
STV0903 is a high performance satellite
demodulator capable of handling DVB-S,
DIRECTV
8PSK) constant coding and modulation signals for
satellite broadcast.
AGCRF
[IN, IP]
[QN, QP]
XTALI
XTALO
SCL, SDA
SDAT, SCLT
DISEQCIN
DISEQCOUT
FSKRX_IN
FSKRX_OUT
GPIO[13:1]
TAP
D[7:0]
CLKOUT
STROUT
DPN
ERROR
Dual
8-bit ADC
Clock generation
Slave I2C
manager
DiSEqCTM 2.0
manager
FSK manager
JTAG
boundary
scan
ASIC controller
and
power management
GPIO
switch matrix
Transport
stream
manager
FIFO Line 1
IO and
RF AGC
Multi-standard demodulator
Carrier
recovery
Lock indicator and
monitoring
DVBS2 FEC
LDPC decoder
BCH decoder
DVBS2 de-framing
CRC checker
loop
Multi roll-off
nyquist and
interpolation
Timing
recovery
loop
filters
CNR
estimator
Legacy FEC
Viterbi decoder
Inner de-interleaver
Reed-solomon decoder
Energy descrambler
DVBS2
pilots
processor
and framing
Echo
concealment
equalizer
Demapper
August 2008 Rev 1 1/5
For further information contact your local STMicroelectronics sales office.
www.st.com
5
Application STV0903
1 Application
Figure 1. Application diagram for DVB-S2 front-end system
Choke
STV6110A
SatTuner
RF_IN
15 Ω
SDA, SCL
AGC
IN,IP
QN,QP
XTAL_OUT
27 MHz
LNBH23
I2C
16 MHz
DISEQC-RX
STV0903
SDAT, SCLT
AGCRF
IM,IP
QM,QP
XTAL_IN
DISEQC_IN
DISEQC_OUT
AUX_CLK
C
STx7100 or
STx7109
MPEG-4 / H.264
Decoder IC
2
I
2/5
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