MC92308 Datasheet, PDF (1/4 Pages) Motorola, Inc – OFDM Demodulator

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Current [e-mail]/ADC
Product Preview
OFDM Demodulator
The MC92308 is a Orthogonal Frequency Division Multiplex Demodulator for 2K
transmission mode according to the ETSI specification for digital terrestrial broadcast-
ing (PR ETS 300744). The MC92308 contains all the functionality required to demod-
ulate the information transmitted in one UHF channel.
Feature Summary
• Usable for 8MHz/7MHz/6MHz channels by adjusting the clock rate
• Digital I/Q separation on-chip
• Supports QPSK, 16-QAM and 64-QAM
• Supports all guard interval lengths (1/32, 1/16, 1/8, 1/4)
• Accepts 8-bit TTL-compatible twos-complement data input
• Provides the required control signals for Automatic Gain Control and ADC clock
frequency control
• Performs channel estimation and correction by using the embedded pilot carriers
• I²C serial bus compatible interface (M-Bus) and parallel interface for external pro-
gramming and control of the device
• Transmission Parameter Signalling is decoded and made available to the system
controller via M-Bus or parallel microprocessor interface
• Companion to DVB compliant 2K-FFT Processor (MC92307)
• Output interface for DBV compliant FEC
• Fast synchronization at power-on and after channel switch
• Low implementation margin
• 0.5µ CMOS Process at 3.3V
MC92308
RESB
CLKCTLP
CLK
CLKCTLN
AGCCTLP
AGCCTLN
ADCDATA[7:0]
FFTSTART
CLKEN18
FFTDO[7:0]
SYMSYNC
FFTDI[11:0]
MBUS[1:0]
FECCLK
DVALID
G1DATA[2:0]
G2DATA[2:0]
Ordering Information
Device
Package
MC92308CI 160MQUAD
Figure 1. OFDM Frontend Processing
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
© MOTOROLA, INC. 1997
5/7/97