Sanyo LC78626KE Manual

Ordering number : EN5995
Overview
The LC78626KE is a monolithic compact disk player
signal processing and servo control CMOS IC equipped
with an internal anti-shock control function. Designed for
total functionality including support for EFM-PLL, and
one-bit D/A converter, and containing analog low-pass
filter, the LC78626KE provides optimal cost-performance
for low-end CD players that provide anti-shock systems
by eliminating as many unnecessary features as possible.
The basic functions provided by this IC include
modulation of the EFM signal from the optical pick-up,
deinterleaving, detection and correction of signal errors,
prevention of a maximum of approximately 38 seconds of
skipping, signal processing such as digital filtering (which
is useful in reducing the cost of the player), and processing
of a variety of servo-related commands from the
microprocessor. The LC78626KE is an improved version
of the LC78626E. It provides 8× oversampling digital
filters and supports up to 16M of DRAM.
Functions
• When an HF signal is input, it is sliced to precise levels
and converted to an EFM signal. The phase is compared
with the internal VCO and a PLL clock is reproduced at
an average frequency of 4.3218 MHz.
• Precise timing for a variety of required internal timing
needs (including the generation of the reference clock) is
produced by the attachment of an external 16.9344 MHz
crystal oscillator.
• The speed of revolution of the disk motor is controlled
by the frame phase difference signal generated by the
playback clock and the reference clock.
• The frame synchronizing signal is detected, stored, and
interpolated to insure stable data read back.
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.
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.
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DSP for Compact Disk Players
• The EFM signal is demodulated and converted to 8-bit
symbolic data.
• The demodulated EFM signal is divided into subcodes
and output to the external microprocessor. (Three
general I/O ports are shared [exclusively] for this
purpose.)
• After the subcode Q signal passes the CRC check, it is
output to the microprocessor through a serial
transmission (LSB first).
• The demodulated EFM signal is buffered in the internal
RAM, which is able to absorb ±4 frame's worth of jitter
resulting from variations in the disk rotation speed.
• The demodulated EFM signal is unscrambled to a
specific sequence, and deinterleaving is performed.
Package Dimensions
unit: mm
3151-QFP100E
[LC78626KE]
0.65
0.575
80
81
100
1
CMOS IC
LC78626KE
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SANYO: QFP100E (QIP100E)
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