LC78626E

Ordering number : EN5692 CMOS LSI LC78626E DSP for Compact Disk Players 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. 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 f...