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LC78631 Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer LC78631
Beschreibung Compact Disk Player DSP
Hersteller Sanyo Semicon Device
Logo Sanyo Semicon Device Logo 




Gesamt 30 Seiten
LC78631 Datasheet, Funktion
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






LC78631 Datasheet, Funktion
LC78631E
Figure 4 General-Purpose Port Read
Figure 5 General-Purpose Port Output
No. 5342-6/34

6 Page









LC78631 pdf, datenblatt
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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