參數(shù)資料
型號(hào)： LC78626
廠商： Sanyo Electric Co.,Ltd.
元件分類： 數(shù)字信號(hào)處理
英文描述： 16-bit fixed point DSP with Flash
中文描述： 具有閃存的 16 位定點(diǎn) DSP
文件頁(yè)數(shù)： 1/32頁(yè)
文件大?。?/td> 475K
代理商： LC78626
Overview
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
microprocessor.
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.
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.
Error detection and correction is performed, as is a flag
process. (C1: two error/C2: two error correction
method.)
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.
Package Dimensions
unit: mm
3151-QFP100E (FLP100)
CMOS LSI
13098HA(OT) No. 5692-1/32
SANYO: QIP100E (FLP100)
[LC78626E]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
DSP for Compact Disk Players
LC78626E
Ordering number : EN5692
Continued on next page.
相關(guān)PDF資料
PDF描述
LC78626E 16-bit fixed point DSP with Flash
LC78628 16-bit fixed point DSP with Flash
LC78628E 16-bit fixed point DSP with Flash
LC78630 16-bit fixed point DSP with Flash
LC78630E 16-bit fixed point DSP with Flash
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC78626E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DSP for Compact Disk Players
LC78626KE 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CD-Player Processor/Controller
LC78628 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP with Built-in HDCD Decoder
LC78628E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP with Built-in HDCD Decoder
LC7863 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS
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