Datasheet > LC78625

LC78625

更新时间： 2024-09-22 22:37:07

品牌	Logo	应用领域
三洋 - SANYO		/
页数	文件大小	规格书
35页	436K
描述
Compact Disc Player DSP

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中文翻译

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数据手册

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LC78625 数据手册

Ordering number : EN5502

CMOS LSI

LC78625E

Compact Disc Player DSP

• Demodulated EFM signal buffering in internal RAM to

handle up to ±4 frames of disc rotational jitter

• Demodulated EFM signal reordering in the prescribed

order for data unscrambling and de-interleaving

• Error detection, correction, and flag processing (error

correction scheme: dual C1 plus dual C2 correction)

• The LC78625E sets the C2 flags based on the C1 flags

and a C2 check, and then performs signal interpolation

or muting depending on the C2 flags. The interpolation

circuit uses a quadruple interpolation scheme. The

output value converges to the muting level when four or

more consecutive C2 flags occur.

Overview

The LC78625E is a CMOS LSI that implements the signal

processing and servo control required by compact disc

players, laser discs, CD-V, CD-I and related products. The

LC78625E provides several types of signal processing,

including demodulation of the optical pickup EFM signal,

de-interleaving, error detection and correction, and digital

filters that can help reduce the cost of CD player units. It

also processes a rich set of servo system commands sent

from the control microprocessor. It also incorporates an

EFM-PLL circuit and a one-bit D/A converter.

This LSI is an improved version of the LC78620E. In

addition to supporting low-voltage operation, on/off

control of the de-emphasis function and use of the

bilingual function have been enabled in certain additional

modes.

Package Dimensions

unit: mm

3174-QFP80E

[LC78625E]

Functions

• The LC78625E takes an HF signal as input, digitizes

(slices) that signal at a precise level, converts that signal

to an EFM signal, and generates a PLL clock with an

average frequency of 4.3218 MHz by comparing the

phases of that signal and an internal VCO.

• A precise reference clock and the necessary internal

timings are generated using an external 16.9344 MHz

crystal oscillator.

• Disc motor speed control using a frame phase difference

signal generated from the playback clock and the

reference clock

• Frame synchronization signal detection, protection, and

interpolation to assure stable data readout

• EFM signal demodulation and conversion to 8-bit

symbol data

SANYO: QFP80E

• Subcode data separation from the EFM demodulated

signal and output of that data to an external

microprocessor

• Subcode Q signal output (LSB first) to a microprocessor

over the serial interface after performing a CRC error

check

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

22897HA (OT) No. 5502-1/35

12 3 4 5 6 7...35

中文翻译

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与LC78625相关器件

型号	品牌	获取价格	描述	数据表
LC78625E	SANYO	获取价格	Compact Disc Player DSP
LC78626	SANYO	获取价格	DSP for Compact Disk Players
LC78626E	SANYO	获取价格	DSP for Compact Disk Players
LC78626KE	SANYO	获取价格	CMOS LSI
LC78628	SANYO	获取价格	Compact Disc Player DSP with Built-in HDCD Decoder
LC78628E	SANYO	获取价格	Compact Disc Player DSP with Built-in HDCD Decoder
LC7863	SANYO	获取价格	DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS
LC78630	SANYO	获取价格	Compact Disk Player DSP
LC78630E	SANYO	获取价格	Compact Disk Player DSP
LC78631	SANYO	获取价格	Compact Disk Player DSP

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