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TDA8043 датащи(PDF) 3 Page - NXP Semiconductors |
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TDA8043 датащи(HTML) 3 Page - NXP Semiconductors |
3 / 16 page 1998 Feb 13 3 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 |
Аналогичный номер детали - TDA8043 |
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Аналогичное описание - TDA8043 |
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