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Ordering number : EN 5342

CMOS LSI

LC78631E

Compact Disk Player DSP

Overview

The LC78631E is a compact disc D/A signal-processing

LSI for CD-ROM drives that provides a variable clock

error correction (VCEC) mode. The LC78631E

demodulates the EFM signal from the optical pickup and

performs de-interleaving, error detection, error correction,

digital filtering, and other processing. The LC78631E

includes an on-chip 1-bit D/A converter, and executes

commands sent from a control microprocessor.

Package Dimensions

unit: mm

3174-QFP80E

[LC78631E]

Features

鈥?VCEC support

鈥?Built-in PLL circuit for EFM detection (supports 4脳

playback)

鈥?Built-in PLL for variable pitch playback (鹵13%)

鈥?18KB RAM on chip

鈥?Error detection and correction (corrects two errors in C1

and four errors in C2)

鈥?Frame jitter margin: 鹵8 frames

鈥?Frame synchronization signal detection, protection, and

insertion

鈥?Dual interpolation adopted in the interpolation circuit.

鈥?EFM data demodulation

鈥?Subcode demodulation

鈥?Zero-cross muting adopted

鈥?Servo command interface

鈥?2fs digital filter

鈥?Digital de-emphasis

鈥?Built-in independent left- and right-channel digital

attenuators (239 attenuation steps)

鈥?Supports the bilingual function

鈥?Left/right swap function

鈥?Built-in 1-bit D/A converter (third-order

鈭嗏垜

noise

shaper, PWM output)

鈥?Built-in digital output circuit

鈥?CLV servo

鈥?Arbitrary track jumping (of up to 255 tracks)

鈥?Variable sled voltage (four levels)

鈥?Six extended I/O ports and 2 extended output ports

鈥?Built-in oscillator circuit using an external 16.9344 MHz

or 33.8688 MHz (for 4脳 playback) element

鈥?Supply voltage: 3.6 to 5.5 V (4.75 to 5.5 V for 4脳

playback mode)

SANYO: QFP80E

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

62096HA (OT) No. 5342-1/34

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