Ordering number : EN*5059A
CMOS LSI
LC89602
Audio Decoder LSI for Mini-Disk Playback
Preliminary
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.
Package Dimensions
unit: mm
3174-QFP80E
[LC89602]
SANYO: QIP80E
Features
鈥?Stereo audio expansion implemented in a single chip
鈥?High-precision arithmetic using a 24-bit multiplier
鈥?Expanded dynamic range provided by a block floating-
point circuit
鈥?Two output systems and independent attenuators built in
鈥?Digital audio outputs with a 20-bit data width and
digital audio interface outputs
鈥?Low power design implemented in a 0.8 碌m CMOS
process
鈥?CCB CPU interface
鈥?Low-voltage operation (V
DD
= 3.6 to 5.5 V)
鈥?Package: QIP80E
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
N2494MO No. 5059-1/6
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