LC78621E

Ordering number : EN*5223 CMOS LSI LC78621E Compact Disc Player DSP Preliminary Overview The LC78621E is a CMOS LSI that implements the signal processing and servo control required by compact disk players, laser disks, CD-V, CD-I and related products. The LC78621E 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. Support for command input from a control microprocessor: commands include track jump, focus start, disk motor start/stop, muting on/off and track count (8 bit serial input) Built-in digital output circuits. Arbitrary track counting to support high-speed data access Zero cross muting Supports the implementation of a double-speed dubbing function. D/A converter outputs with data continuity improved by 8× oversampling digital filters. (These filters function as 4× oversampling filters during double-speed playback.) Built-in third-order ∑∆ D/A converters (PWM output) Built-in digital attenuator (8 bits – alpha, 239 steps) Built-in digital de-emphasis Built-in digital level and peak meter functions Support for bilingual applications Functions Input signal processing: The LC78621E takes an HF signal as input, digitizes (...