LC78630 データシートの表示（PDF） - SANYO -> Panasonic

部品番号

コンポーネント説明

メーカー

LC78630

Compact Disk Player DSP

SANYO -> Panasonic 

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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