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LC7851

更新时间： 2024-09-21 22:40:07

品牌	Logo	应用领域
三洋 - SANYO		/
页数	文件大小	规格书
9页	167K
描述
QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception

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LC7851 数据手册

Ordering number : EN5691

CMOS LSI

LC7851E

QPSK Demodulation and Audio Signal-Processing IC

for Satellite Broadcast Reception

• Ten to 14 bit expansion of audio data during A mode

broadcasts.

Overview

The LC7851E demodulates the QPSK (quadrature phase

shift keying) modulated audio data broadcast by the

Japanese BS and CS broadcast satellites and converts that

data to an analog audio signal. This IC integrates on a

single chip the audio system signal processing required for

BS and CS receivers from QPSK demodulation to analog

audio reproduction. The main functions provided by the

LC7851E include QPSK demodulation, differential

decoding conversion, descrambling, deinterleaving, and

error correction. It also generates a PCM audio signal. The

PCM audio signal is converted to an analog audio signal

by on-chip digital filters and A/D converters.

• Data protection using majority control for the upper bits

of the audio data during B mode broadcasts

• Full complement of muting functions

— Audio suppression provided (bit 16 of the post-

majority decision control bits)

— Non-audio signal suppression (bits 2 to 5 of the post-

majority decision control bits)

— Forced muting

— Muting when not synchronized

— Muting when large numbers of errors are detected

(modifiable conditions)

— Channel switching

— Charged (pay-per-view) program flag muting

— Mute detection output provided.

• General-purpose ports (2 input ports and 8 output ports)

• EIAJ digital audio interface output

• 8× oversampling digital filters

• Multi-bit D/A converter (with built-in output operational

amplifiers)

• 5 V single-voltage power supply

Features

• QPSK demodulator, PCM decoder, digital filters, D/A

converters, and operational amplifiers integrated on a

single chip.

• The number of required external components has been

reduced and adjustment-free operation achieved in the

QPSK demodulator by implementing that block as a

digital circuit on a single chip.

• QFP (QIP) 64E package

• CPU interface using an I C bus

• Interface circuits for CORTEC and SkyPort

descramblers

Package Dimensions

unit: mm

Functions

• QPSK demodulation

3195-QFP64E

[LC7851E]

• Bit timing clock recovery

• Differential decoding conversion and parallel-to-serial

conversion

• Frame synchronization (forward protection: 8 cycles,

back protection: 3 cycles): Frame synchronized/not

synchronized detection flag output provided.

• Tenth-order M-series descrambling

• Deinterleaving

• BCH (63, 56) error correction and dual error detection:

Single error detected flag output provided.

• Support for both interpolation and previous data hold

when a dual error is detected.

Control bit majority judgment protection every 16

frames

SANYO: QIP64E

• Register data previous value hold when dual errors are

detected using BCH(7,3)

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

83097HA(OT) No. 5691-1/9

12 3 4 5 6 7...9

中文翻译

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与LC7851相关器件

型号	品牌	获取价格	描述	数据表
LC7851E	SANYO	获取价格	QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception
LC78601E	SANYO	获取价格	Compact Disc Player DSP with Built-in Microcontroller
LC78602NE	SANYO	获取价格	Compact Disc Player DSP with Built-in Microcontroller
LC78604E	ONSEMI	获取价格	IC,CD-PLAYER PROCESSOR/CONTROLLER,CMOS,QFP,64PIN,PLASTIC
LC78605E	SANYO	获取价格	Compact Disc Player DSP with Built-in Microcontroller
LC7860KA	SANYO	获取价格	DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS
LC7860N	SANYO	获取价格	DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS
LC78615E	ONSEMI	获取价格	Compact Disc Player IC
LC78615E-01US-H	ONSEMI	获取价格	Compact Disc Player IC
LC78616PE	ONSEMI	获取价格	Digital Servo Processor LSI

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