LC78684E データシートの表示（PDF） - SANYO -> Panasonic

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LC78684E

MP3 Decoder for Compact Disc Players

SANYO -> Panasonic 

Ordering number : ENN7350

CMOS IC

LC78684E

MP3 Decoder for Compact Disc Players

Overview

The LC78684E integrates, on a single chip, CD-ROM

signal-processing functions, MP3 signal-processing func-

tions, and CD-DA shockproof signal-processing functions.

The LC78684E achieves significant power savings by

implementing signal-processing functions using hard-

wired structures.

A CD player that supports playback of MPEG audio

(MP3) recorded on CD media as well as CD-DA

shockproof playback can be implemented by combining

this IC with a CD DSP, DRAM, and audio D/A converter,

and other circuits.

Features

x MP3 Decoding Functions (MPEG audio standard

[ISO/IEC 11172-3] layer 3)

 Decodes to a digital audio signal MP3 data decoded

by the CD-ROM decoder and outputs that audio

signal.

 Supports all bit rates, including variable bit rate

operation.

 Supports the following sampling rates.

MPEG1 (Fs = 32 K, 44.1 K, 48 K)

MPEG2 (Fs = 16 K, 22.05 K, 24 K)

MPEG2.5 (Fs = 8 K, 11.025 K, 12 K)

 Can read out the MPEG header and ancillary data.

 Automatically mutes the signal on CRC errors using

an MP3 CRC check function.

 External MPEG serial data input function supports

memory card playback.

x CD-ROM Decoding Functions

 Supports CD-ROM modes 1 and 2 (forms 1 and 2)

 Faithfully reproduces data stored on CD-ROM discs

using CD-ROM error correction functions.

 Header and sector management

 Supports playback speeds up to 4×.

 In addition to data buffering also supports C2 error

flag buffering.

 Provides external serial output of decoded CD-ROM

data.

x CD-DA Playback Functions (Shockproof support)

 Shockproof operation for about 180 seconds (com-

pressed mode) when 64M DRAM is used.

 Shockproof function supports compressed, uncom-

pressed, and data through modes.

 VCEC (variable speed) supports up to 4×-speed play-

back.

x Audio Signal Processing

 Serial audio signal output using LRCK, BCK, and

DATA signals.

(I²S format, either 16-bit or 20-bit precision PCM

output, data-slot supports 16-bit, 24-bit, and 32-bit

modes)

 Digital bass boost function (4 modes), attenuator

function, and muting (f, 12 dB)

 Provides a base clock (384 fs) output pin for use with

external digital filters and D/A converters.

x DRAM Interface

 Supports the use of from 1M to 64M of external

DRAM (EDO, 2CAS, 16-bit data bus memory)

 Supports allocation of a user area in DRAM during

CD-ROM (MP3) playback.

Continued on next page.

Q Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control

systems, or other applications whose failure can be reasonably expected to result in serious physical

and/or material damage. Consult with your SANYO representative nearest you before using any SANYO

products described or contained herein in such applications.

Q SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

20703RM(OT) No.7350-1/21

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