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LC78630 Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer LC78630
Beschreibung Compact Disk Player DSP
Hersteller Sanyo Semicon Device
Logo Sanyo Semicon Device Logo 




Gesamt 30 Seiten
LC78630 Datasheet, Funktion
Ordering number : EN 5121B
CMOS LSI
LC78630E
Compact Disk Player DSP
Overview
The LC78630E is a CD-DA signal-processing LSI for use
in video CD player systems. The LC78630E incorporates
signal-processing circuits for demodulating and de-
interleaving the EFM signal from the optical pickup, error
detection and correction, and digital filtering. It also
includes a 1-bit D/A converter and executes commands
sent from a system control microprocessor.
Features
• Built-in PLL for EFM signal synchronization (a hybrid
analog-digital PLL that 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)
• 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)
• 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 (4.5 to 5.5 V for 4×
playback mode)
• Six extended I/O ports and 2 extended output ports
Package Dimensions
unit: mm
3174-QFP80E
[LC78630E]
SANYO: QIP80E
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83097HA (OT)/D3095HA (OT)/60595HA (OT) No. 5121-1/33






LC78630 Datasheet, Funktion
LC78630E
No. 5121-6/33

6 Page









LC78630 pdf, datenblatt
LC78630E
• 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
8-cm DISC LOADED
12-cm DISC LOADED
RES = low
r
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
r
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
r
r
r
No. 5121-12/33

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