L64704 LSI Logic Corporation, L64704 Datasheet - Page 105

• Manufacturer Part Number: L64704
• Description: Satellite Decoder Technical Manual 5/97
• Manufacturer: LSI Logic Corporation

5.1
Overview
Chapter 5
Demodulator Module
Functional Description
This chapter describes the function of the BPSK/QPSK Demodulator
module within the L64704 and is divided into the following sections:
The Demodulator Module connects to the satellite receiver circuitry in the
set-top box to recover the modulated MPEG-2 transport stream.
Figure 5.1
tor and its associated circuitry.
Section 5.1, “Overview,”
Demodulator Module and shows how it fits into a set-top decoder.
Section 5.2, “DC Offset Compensation and Coupling to ADC Output,”
describes the L64704’s DC Offset Compensation circuit.
Section 5.3, “Decimation Filters,”
filters.
Section 5.4, “Matched Filter,”
branch decimation filter.
Section 5.5, “Channel Clock Recovery,”
Channel Clock recovery loop.
Section 5.6, “Carrier Synchronizer,”
necessary to implement the Carrier Synchronizer circuit.
Section 5.7, “Automatic Gain Control (AGC),”
automatic gain control.
Section 5.8, “Output Control,”
demodulator’s output control circuitry.
Section 5.9, “Other Functions,”
in the L64704’s BPSK/QPSK Demodulator.
shows the connections between the BPSK/QPSK Demodula-
provides a high-level description of the
provides information on the I and Q
provides information on the QPSK
describes all of the remaining circuitry
describes the two input decimation
describes the logic that is
provides information on the
describes the L64704’s
5-1