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LC78681E Arkusz danych(PDF) 1 Page - Sanyo Semicon Device |
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1 / 23 page Ordering number : EN4521 O3098HA (OT)/D2593JN B8-0235 No. 4521-1/23 LC78681E SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN Digital Signal Processor for Compact Disc Players CMOS LSI Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. Overview The LC78681E is a CMOS LSI providing digital signal processing (DSP) and servo control for compact disc players and other audio devices, including laser disc players and equipment using compact disc video (CD-V) and compact disc interactive (CD-I) formats. Functions include the demodulation of EFM (eight-to- fourteen modulation) signals from optical pickups, deinterleaving, detection and correction of error signals, and signal processing for digital filters as well as other features that can help reduce player cost. The LC78681E also processes commands from the microprocessor for the servo system. Direct interface is also possible with the Sanyo LC7883K and LC78835, which are serial input D/A converters with on-chip digital filters. Functions • HF signals that are input are sliced at an accurate level, converted to EFM signals, and undergo phase- comparison with VCO for PLL playback at an average of 4.3218 MHz. • Through external connection of a 16.9344 MHz crystal oscillator, all required timing signals can be generated on-chip, including the standard clock. • Frame phase difference signals made from the playback clock and the reference clock can control the speed of the disc motor. • Performs detection, protection, and interleaving of frame synchronization signals, ensuring stable data reading. • Demodulates EFM signals and performs conversion to 8-bit symbol data. • Separates subcodes from EFM demodulation signals for output to an external microprocessor. • After CRC checking, Q subcode signals are output to the microprocessor by the serial I/O interface (LSB-first output selectable). • On-chip RAM performs buffering for EFM demodulation signals, as well as absorbing up to ±4 frames of jitter due to fluctuations in the speed of disc rotation. • Performs unscrambling and deinterleaving for rearranging the EFM demodulation signals into the specified sequence. • Performs detection and correction of error signals, as well as error flag processing (double C1 and double C2 error correction system). • Compares the results of the C1 flag and the C2 check to set the C2 flag, and performs signal interpolation and previous-value hold according to the C2 flag. The interpolator uses 4-interpolation, where 0 volt down is performed when the C2 flag is set four times in a row. • Performs functions such as track jump, focus start, disc motor start and stop, muting on and off, and track count when the appropriate command is input from the microprocessor (8-bit serial input). • Features on-chip digital out. • Can perform the desired track counting. High-speed access is possible. • Uses zero cross-muting. • Fully supports double-speed dubbing. • Supports all types of D/A conversion. • Features on-chip digital level meter and peak meter functions. • Supports bilingual function. Features • Compact and space-saving 64-pin QFP package • Silicon-gate CMOS design (low power dissipation) • Single 5 V power supply (suitable for portable sets) • DEMO pin for improved operability in adjustment |
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