LC78631中文資料三洋數(shù)據(jù)手冊(cè)PDF規(guī)格書

Overview

The LC78631E is a compact disc D/A signal-processing LSI for CD-ROM drives that provides a variable clock error correction (VCEC) mode. The LC78631E demodulates the EFM signal from the optical pickup and performs de-interleaving, error detection, error correction, digital filtering, and other processing. The LC78631E includes an on-chip 1-bit D/A converter, and executes commands sent from a control microprocessor.

Features

? VCEC support

? Built-in PLL circuit for EFM detection (supports 4× playback)

? Built-in PLL for variable pitch playback (±13)

? 18KB RAM on chip

? Error detection and correction (corrects two errors in C1 and four errors in C2)

? Frame jitter margin: ±8 frames

? Frame synchronization signal detection, protection, and insertion

? Dual interpolation adopted in the interpolation circuit.

? EFM data demodulation

? Subcode demodulation

? Zero-cross muting adopted

? Servo command interface

? 2fs digital filter

? Digital de-emphasis

? Built-in independent left- and right-channel digital attenuators (239 attenuation steps)

? Supports the bilingual function

? Left/right swap function

? Built-in 1-bit D/A converter (third-order ?∑ noise shaper, PWM output)

? Built-in digital output circuit

? CLV servo

? Arbitrary track jumping (of up to 255 tracks)

? Variable sled voltage (four levels)

? Six extended I/O ports and 2 extended output ports

? Built-in oscillator circuit using an external 16.9344 MHz or 33.8688 MHz (for 4× playback) element

? Supply voltage: 3.6 to 5.5 V (4.75 to 5.5 V for 4×playback mode)