TDA8043 Datasheet, PDF (3/16 Pages) NXP Semiconductors – Satellite Demodulator and Decoder SDD

Philips Semiconductors
Satellite Demodulator and Decoder (SDD)
Product specification
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
TDA8043H
PACKAGE
NAME
DESCRIPTION
QFP100 plastic quad flat package; 100 leads (lead length 1.95 mm);
body 14 × 20 × 2.8 mm
VERSION
SOT317-2
1998 Feb 13
3