MC92314 데이터 시트보기 (PDF) - Motorola => Freescale

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MC92314

DVB-T Single Chip Demodulator Application Note

Motorola => Freescale 

Freescale Semiconductor, Inc.

System Overview

SECTION 1

SYSTEM OVERVIEW

In this Application Note Motorola’s single chip demodulator and FEC for DVB-T receivers along

with the usual application is described.

This section covers the overall descriptions as well as an introduction into the DVB-T standard,

supporting the understanding of the special features of the OFDM system.

1.1 General Description

Before describing the important specialities of the DVB-T system itself the key features of

n Motorola’s single chip are outlined.

tio • 0.35mm CMOS process at 3.3 V.

a • 160 pin QFP package

m • 169 BGA package

Infor There are two main sections in the chip, providing the functions necessary to obtain a complete

MPEG-2 transport stream out of one real IF-sampled DVB-T signal. The steps necessary are

y OFDM demodulation and FEC decoding, corresponding to the three separate devices

r described in Reference [1-4]:

ina Important capabilities of the FFT/OFDM block:

lim • Usable for 8 MHz, 7 MHz and 6 MHz channel bandwidth by adjusting the clock rate.

e • C/N performance according to Reference [1-1] Annex A with a degradation margin of 3 dB.

Pr • Supported DVB-T modulation schemes: QPSK, 16-QAM and 64-QAM.

• Automatic lock onto all specified guard interval lengths (1/32, 1/16, 1/8, 1/4).

• Data input: 8 Bit TTL compatible 2’s complement or offset binary.

• Channel estimation and correction using the pilot carriers.

• I2C compatible interface (M-Bus).

• Transmission Parameter Signalling (TPS) data is decoded and made available to the

system controller via M-Bus.

• Processing of one block of 2048 complex samples (i.e. one 2K-OFDM symbol) in 224 ms.

• FFT input wordlength 8 bit, output accuracy 12 bit.

• Overflow on certain OFDM subcarriers due to co-channel interferes is prevented internally.

Single Chip DVB-T Demodulator - Rev. 1.3 (11/30/98)

For More Information On This Product,

Go to: www.freescale.com

MOTOROLA

1-1

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