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MP3 Decoder for Compact Disc Players
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-
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.
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
Supports all bit rates, including variable bit rate
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
Provides external serial output of decoded CD-ROM
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-
x Audio Signal Processing
Serial audio signal output using LRCK, BCK, and
(I²S format, either 16-bit or 20-bit precision PCM
output, data-slot supports 16-bit, 24-bit, and 32-bit
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.
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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