MC92314 Datasheet, PDF (20/100 Pages) Motorola, Inc – DVB-T Single Chip Demodulator Application Note

Device Description
Freescale Semiconductor, Inc.
Top boxes according to the DVB-T standard for 2K transmission. One block of 2048 complex
samples can be processed in 224 µs
NOMUX
DIN 8
DINR 8
FFTSTART
Input
Buffer
16
FFT (11 stages)
incl. Rounding
24
Output
Reorder
Buffer
12 DOUT
12 DOUTR
RESB
CLK
Twiddle Factor ROM
Control
FFTSTART
tion ^OFFSET
a RES[1:0]
REVRSB
SYMSYNC
form _{Figure 3-2. Block Diagram of the FFT Processor}
In _{3.2.2 2K-OFDM Demodulator Block}
ry _{The MC92314 contains also a Demodulator for the Orthogonal Frequency Division Multiplex}
a _{transmission scheme according to the 2K-mode of the ETSI specification for digital terrestrial}
in transmission (see reference [1-1]). Together with the 2K FFT block described in the previous
paragraph it includes all the functions required to demodulate the information transmitted in one
lim ^{single UHF channel. In Figure 3-3 the block diagram of the OFDM block is given, followed by the}
Pre ^{description of the functional blocks.}
MOTOROLA
3-2
Single Chip DVB-T Demodulator - Rev. 1.3 (11/30/98)
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