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參數資料
| 型號： | LC78625E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數： | 1/35頁 |
| 文件大小： | 535K |
| 代理商： | LC78625E |
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SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Overview
The LC78625E is a CMOS LSI that implements the signal
processing and servo control required by compact disc
players, laser discs, CD-V, CD-I and related products. The
LC78625E provides several types of signal processing,
including demodulation of the optical pickup EFM signal,
de-interleaving, error detection and correction, and digital
filters that can help reduce the cost of CD player units. It
also processes a rich set of servo system commands sent
from the control microprocessor. It also incorporates an
EFM-PLL circuit and a one-bit D/A converter.
This LSI is an improved version of the LC78620E. In
addition to supporting low-voltage operation, on/off
control of the de-emphasis function and use of the
bilingual function have been enabled in certain additional
modes.
Functions
The LC78625E takes an HF signal as input, digitizes
(slices) that signal at a precise level, converts that signal
to an EFM signal, and generates a PLL clock with an
average frequency of 4.3218 MHz by comparing the
phases of that signal and an internal VCO.
A precise reference clock and the necessary internal
timings are generated using an external 16.9344 MHz
crystal oscillator.
Disc motor speed control using a frame phase difference
signal generated from the playback clock and the
reference clock
Frame synchronization signal detection, protection, and
interpolation to assure stable data readout
EFM signal demodulation and conversion to 8-bit
symbol data
Subcode data separation from the EFM demodulated
signal and output of that data to an external
microprocessor
Subcode Q signal output (LSB first) to a microprocessor
over the serial interface after performing a CRC error
check
Demodulated EFM signal buffering in internal RAM to
handle up to ±4 frames of disc rotational jitter
Demodulated EFM signal reordering in the prescribed
order for data unscrambling and de-interleaving
Error detection, correction, and flag processing (error
correction scheme: dual C1 plus dual C2 correction)
The LC78625E sets the C2 flags based on the C1 flags
and a C2 check, and then performs signal interpolation
or muting depending on the C2 flags. The interpolation
circuit uses a quadruple interpolation scheme. The
output value converges to the muting level when four or
more consecutive C2 flags occur.
Package Dimensions
unit: mm
3174-QFP80E
SANYO: QFP80E
[LC78625E]
CMOS LSI
Ordering number : EN5502
22897HA (OT) No. 5502-1/35
LC78625E
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Compact Disc Player DSP
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| LC78626 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DSP for Compact Disk Players |
| LC78626E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DSP for Compact Disk Players |
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