ST STV0903 User Manual

STV0903

Multi-standard advanced demodulator for satellite digital TV and data services set-top boxes

Features

■Demodulation

–DIRECTVTM and DVBS QPSK

–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 DIRECTVTM at input to legacy FEC

■Interfaces

–Dedicated 27 MHz clock generation for back-end decoder

–I2C serial bus interface

–JTAG interface - boundary scan

Data Brief

–DiSEqCTM 2.x interface

–GPIOs and interrupt lines

–Monitoring through I2C serial interface

–FSK modem

■Technology

–90 nm CMOS process

–Power saving features

■Package

–LQFP-128-EP 14x14, 0.4 mm pitch, RoHS.

Description

STV0903 is a high performance satellite demodulator capable of handling DVB-S, DIRECTVTM legacy and DVBS2 (QPSK and 8PSK) constant coding and modulation signals for satellite broadcast.

AGCRF

[IN, IP]

Dual

Multi roll-off

DVBS2

[QN, QP]

8-bit ADC

IO and

nyquist and

pilots

XTALI

RF AGC

interpolation

processor

XTALO

Clock generation

ASIC controller

filters

and framing

SCL, SDA

and

SDAT, SCLT

Slave I2C

power management

Multi-standard demodulator

Echo

manager

concealment

DISEQCIN

Carrier

Timing

CNR

equalizer

recovery

recovery

estimator

DISEQCOUT

DiSEqCTM 2.0

loop

loop

Demapper

FSKRX_IN

manager

GPIO

FSKRX_OUT

switch matrix

GPIO[13:1]

FSK manager

Lock indicator and

TAP

JTAG

monitoring

boundary

scan

DVBS2 FEC

Legacy FEC

		Transport	LDPC decoder	Viterbi decoder
		stream	BCH decoder	Inner de-interleaver
	D[7:0]	manager
	CLKOUT	FIFO Line 1	DVBS2 de-framing	Reed-solomon decoder
	STROUT
	DPN		CRC checker	Energy descrambler
	ERROR

August 2008	Rev 1	1/5
For further information contact your local STMicroelectronics sales office.		www.st.com

Application	STV0903

1 Application

Figure 1. Application diagram for DVB-S2 front-end system

	STV6110A			STV0903		I2C	STx7100 or
							STx7109
	SatTuner		I2C
		SDA, SCL		SDAT, SCLT
							MPEG-4 / H.264
		AGC		AGCRF
							Decoder IC
		IN,IP		IM,IP
	RF_IN
		QN,QP		QM,QP
	XTAL_OUT		16 MHz	XTAL_IN	AUX_CLK
Choke	27 MHz
			DISEQC-RX	DISEQC_IN
	15 Ω	LNBH23		DISEQC_OUT

2/5