Datasheet > MC92307

MC92307

更新时间： 2024-11-04 22:46:19

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		/
页数	文件大小	规格书
10页	122K
描述
2K - Samples FFT-Processor

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数据手册

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MC92307 数据手册

Current information @www.mot.com.sps/ADC

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

MC92307

Advance Information

2K - Samples FFT-Processor

RESB

SYMSYNC

CLK

DOUT[11:0]

The MC92307 is a pipelined Fast Fourier Transformation (FFT) processor with a

blocklength of 2048 complex samples. It is especially designed for use in digital ter-

restrial Set-Top boxes according to the DVB-T standard for 2K transmission. One

block of 2048 complex samples can be processed in 224 µs

DOUTR[11:0]

NOMUX

OFFSET

Feature Summary

•

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

224 µs.

RES[1:0]

•

Designed for direct interfacing with Motorola’s OFDM demodulator MC92308.

Input wordlength 8 bit, output accuracy selectable between 10 and 12 bit.

Overflow on certain OFDM subcarriers due to co-channel interferes is handled in-

ternally.

Readout of output samples can be shifted by half the blocklength to start at the

middle of the output block.

Either multiplexed or non-multiplexed input and output format (the multiplexed

mode allows direct interfacing with Motorola’s OFDM Demodulator MC92308).

Internal Bit reversal can be disabled to allow the construction of FFT modules for

blocklengths > 2K by using several devices in parallel.

Low clock rate inputs and outputs.

FFTSTART

DIN[7:0]

DINR[7:0]

•

Ordering Information

•

Device

Package

0.5µm CMOS process at 3.3 V.

5 V tolerant inputs and outputs.

MC92307CI

160QFP

NOMUX

DIN

DOUT

Output

Reorder

Buffer

Input

Buffer

FFT (11 stages)

incl. Rounding

DINR

12 DOUTR

FFTSTART

RESB

Twiddle Factor ROM

CLK

Control

FFTSTART

SYMSYNC

OFFSET

RES[1:0]

REVRSB

Figure 1. Block diagram of the FFT processor MC92307

This document contains information on a new product.

Speciﬁcations and information herein are subject to change without notice.

MOTOROLA, INC. 1997

8/12/97

12 3 4 5 6 7...10

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