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
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