TDA8043H datasheet(3/16 Pages) PHILIPS

3 / 16 page

1998 Feb 13

Philips Semiconductors

Product speciﬁcation

Satellite Demodulator and Decoder (SDD)

TDA8043

GENERAL DESCRIPTION

This document specifies a DVB compliant demodulator

and forward error correction decoder IC for reception of

QPSK and BPSK modulated signals for satellite

applications.

The TDA8043 can handle variable symbol rates without

adapting the analog filters within the tuner. Typical

applications for this device are:

• Single Carrier Per Channel (SCPC): two or more

QPSK or BPSK modulated signals in a single satellite

channel (transponder)

• Multi-Carrier Per Channel (MCPC): one QPSK or

BPSK modulated signal in a single satellite channel

(transponder)

• Simul-cast: QPSK or BPSK modulated signal together

with a Frequency Modulated (FM) signal in a single

satellite channel.

The SDD requires the analog in-phase (I) and quadrature

(Q) components as an input and provides 8-bit wide

MPEG2 transport packet data at the output. The outputs of

the SDD can be directly connected to a descrambler

(SAA7206) or a demultiplexer (SAA7205).

For evaluation purposes, the output can also be used to

monitor internal data, for example I/Q after demodulation.

The SDD requires a single clock frequency which is

independent of the received symbol rate, providing the

clock frequency is slightly higher than twice the highest

symbol frequency.

All loops to recover the data from the received symbols are

internal. No external loop components are required. Loop

parameters for the clock, carrier recovery and AGC can be

controlled via the I2C-bus.

The Forward Error Correction (FEC) unit has a built-in

state machine to achieve lock without knowing the system

parameters (depuncturing rate, spectral inversion, etc.).

Once lock is achieved, all necessary parameters can be

read via the I2C-bus. By programming these parameters in

advance lock can be achieved more quickly.

The SDD can be controlled and monitored via the I2C-bus.

An I2C-bus default mode is specified which makes it

possible to use the device by software control. A 4-bit

bidirectional I/O expander and an interrupt line are

available. By sending an interrupt signal, the SDD can

inform the microcontroller of its internal status (lock).

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8043H

QFP100

plastic quad ﬂat package; 100 leads (lead length 1.95 mm);

body 14

× 20 × 2.8 mm

SOT317-2

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