LC78631E Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer	LC78631E
Beschreibung	Compact Disk Player DSP
Hersteller	Sanyo Semicon Device
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Gesamt 34 Seiten Ordering number : EN 5342 CMOS LSI LC78631E Compact Disk Player DSP Overview The LC78631E is a compact disc D/A signal-processing LSI for CD-ROM drives that provides a variable clock error correction (VCEC) mode. The LC78631E demodulates the EFM signal from the optical pickup and performs de-interleaving, error detection, error correction, digital filtering, and other processing. The LC78631E includes an on-chip 1-bit D/A converter, and executes commands sent from a control microprocessor. Features • VCEC support • Built-in PLL circuit for EFM detection (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) • Supports the bilingual function • 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) • Six extended I/O ports and 2 extended output ports • 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 (4.75 to 5.5 V for 4× playback mode) Package Dimensions unit: mm 3174-QFP80E [LC78631E] SANYO: QFP80E SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 62096HA (OT) No. 5342-1/34 LC78631E Figure 4 General-Purpose Port Read Figure 5 General-Purpose Port Output No. 5342-6/34 6 Page LC78631E • CLV mode In CLV mode, the system detects the disc speed from the HF signal and holds the disc at the prescribed linear speed using multiple control methods switched by changing the DSP internal mode. The PWM frequency is 7.35 kHz. The V/P pin outputs a high level when the system is in rough servo mode and a low level when it is in phase control mode. Internal mode Rough servo (velocity too low) Rough servo (velocity too high) Phase control (PCK locked) CLV+ High Low PWM CLV– Low High PWM V/P High High Low • Rough servo gain switching Code $A8 $A9 Command SET THE DISC SIZE TO 8 CM SET THE DISC SIZE TO 12 CM RES = low q The CLV control gain in rough servo mode can be reduced by 8.5 dB from the 12-cm disc setting for 8-cm discs. • Phase control gain switching Code $B1 $B2 $B3 $B0 Command CLV PHASE COMPARATOR DIVISOR: 1/2 CLV PHASE COMPARATOR DIVISOR: 1/4 CLV PHASE COMPARATOR DIVISOR: 1/8 NO CLV PHASE COMPARATOR DIVISOR USED RES = low q The phase control gain can be switched by switching the value of the divisor in the dividers in the stage preceding the phase comparator. • Internal brake modes Code $C5 $C4 $A3 $CB $CA $CD $CC Command INTERNAL BRAKE ON INTERNAL BRAKE OFF INTERNAL BRAKE CONT INTERNAL BRAKE CONTINUOUS MODE RESET CONTINUOUS MODE TON MODE DURING INTERNAL BRAKING RESET TON MODE RES = low q q q No. 5342-12/34 12 Page
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Teilenummer	Beschreibung	Hersteller
LC78631	Compact Disk Player DSP	Sanyo Semicon Device
LC78631E	Compact Disk Player DSP	Sanyo Semicon Device

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