LC78624E Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LC78624E

Compact Disc Player DSP

SANYO -> Panasonic 

LC78624E

• CLV mode

In CLV mode the LC78624E detects the disk speed from the HF signal and provides proper linear speed using

several different control schemes by switching the DSP internal modes. The PWM reference period corresponds to

a frequency of 7.35 kHz. The V/P pin outputs a high level during rough servo and a low level during phase control.

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

DISC 8 cm SET

DISC 12 cm SET

RES = low

q

For 8 cm disks, the rough servo mode CLV control gain can be set about 8.5 dB lower than the gain used for 12 cm

disks.

• 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 changed by changing the divisor used by the dividers in the stage immediately

preceding the phase comparator.

A09906

No. 5811-11/27

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