Ordering number : EN*5059A

Overview

The LC89602 is an audio decoder LSI for mini-disk

playback units. This LSI implements the processing that

precedes the D/A converter in playback-only mini-disk

players. That is, the LC89602 receives data in sound

frame units from a mini-disk data decoder LSI (such as

the Sanyo LC89610), expands the audio signal and

decoder that signal directly to a D/A converter. This audio

expander LSI accepts audio data that has been compressed

by a factor of about 5 to 1, and expands that data to audio

data that is equivalent to that from a CD player, namely

16-bit quantized data with a 44.1 kHz sampling frequency.

Since this expansion consists of complex operations

involving discrete cosine transformations and digital

filtering, if the computations performed on this 16-bit data

were performed with a 16-bit precision, the arithmetic

errors associated with the calculations would result in

arithmetic noise in the lower bits and a full 16 bits of

precision would not be acquired. Inversely, increasing the

number of registers and the bus width to improve the

precision of the arithmetic would increase the size of the

circuit and the power required. The LC89602 was

optimized to achieve both the low power required by

portable units as well as the high-precision arithmetic

required by home units.

Features

• Stereo audio expansion implemented in a single chip

• High-precision arithmetic using a 24-bit multiplier

• Expanded dynamic range provided by a block floating-

point circuit

• Two output systems and independent attenuators built in

• Digital audio outputs with a 20-bit data width and

digital audio interface outputs

• Low power design implemented in a 0.8 µm CMOS

process

• CCB CPU interface

• Package: QIP80E

Package Dimensions

unit: mm

3174-QFP80E

Preliminary

SANYO: QIP80E

[LC89602]

CMOS LSI

N2494MO No. 5059-1/6

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Audio Decoder LSI for Mini-Disk Playback

LC89602