LC78626E 데이터시트 PDF

Sanyo Semicon Device에서 제조한 전자 부품 LC78626E은 전자 산업 및 응용 분야에서
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부품번호 LC78626E 기능
기능 DSP for Compact Disk Players
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LC78626E 데이터시트, 핀배열, 회로
Ordering number : EN5692
DSP for Compact Disk Players
The LC78626E 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
LC78626E provides optimal cost-performance for low-end
CD players that provide anti-shock systems. 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 10 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
• 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.
• 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
• 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.
• Error detection and correction is performed, as is a flag
process. (C1: two error/C2: two error correction
• The C2 flag is set after referencing the C1 flag and the
results of the C2 check, where the signal from the C2
flag is interpolated or held at its previous level. The
interpolation circuit uses double interpolation. When
there are two or more C2 flags in a row, the previous
value is held.
Continued on next page.
Package Dimensions
unit: mm
3151-QFP100E (FLP100)
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
13098HA(OT) No. 5692-1/32

LC78626E pdf, 반도체, 판매, 대치품
Pin Assignment
Top view
No. 5692-4/32


LC78626E 전자부품, 판매, 대치품
Figure 1 Command Input
Figure 2 Subcode Q Output
Figure 3 Subcode Output
No. 5692-7/32


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DSP for Compact Disk Players

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DSP for Compact Disk Players

Sanyo Semicon Device
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