Overview

The LC78630E is a CD-DA signal-processing LSI for use in video CD player systems. The LC78630E incorporates signal-processing circuits for demodulating and deinterleaving the EFM signal from the optical pickup, error detection and correction, and digital filtering. It also includes a 1-bit D/A converter and executes commands sent from a system control microprocessor.

Features

• Built-in PLL for EFM signal synchronization (a hybrid analog-digital PLL that 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)

• 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)

• 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 (4.5 to 5.5 V for 4× playback mode)

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