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LC78620E Arkusz danych(PDF) 1 Page - Sanyo Semicon Device |
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LC78620E Arkusz danych(HTML) 1 Page - Sanyo Semicon Device |
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1 / 34 page  92895HA (OT) No. 5130-1/34 Overview The LC78620E 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 LC78620E 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. Functions • Input signal processing: The LC78620E takes an HF signal as input, digitizes (slices) that signal at a precise level, converts that signal to an EFM signal, and generates a PLL clock with an average frequency of 4.3218 MHz by comparing the phases of that signal and an internal VCO. • Precise reference clock and necessary internal timing generation using an external 16.9344 MHz crystal oscillator • Disk motor speed control using a frame phase difference signal generated from the playback clock and the reference clock • Frame synchronization signal detection, protection and interpolation to assure stable data readout • EFM signal demodulation and conversion to 8-bit symbol data • Subcode data separation from the EFM demodulated signal and output of that data to an external microprocessor • Subcode Q signal output to a microprocessor over the serial I/O interface after performing a CRC error check • Demodulated EFM signal buffering in internal RAM to handle up to ±4 frames of disk rotational jitter • Demodulated EFM signal reordering in the prescribed order for data unscrambling and de-interleaving • Error detection, correction, and flag processing (error correction scheme: dual C1 plus dual C2 correction) • The LC78620E sets the C2 flags based on the C1 flags and a C2 check, and then performs signal interpolation or muting depending on the C2 flags. The interpolation circuit uses a quadruple interpolation scheme. The output value converges to the muting level when four or more consecutive C2 flags occur. • 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 • 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 Features • 80-pin QIP (miniature, reduced space package) • Silicon gate CMOS process (for low power) • 5 V single-voltage power supply (for use in portable products) Package Dimensions unit: mm 3174-QFP80E Preliminary SANYO: QIP80E [LC78620E] Ordering number : EN*5130 CMOS LSI LC78620E Compact Disc Player DSP SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN |
Podobny numer części - LC78620E |
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Podobny opis - LC78620E |
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