KB9224 datasheet(39/55 Pages) SAMSUNG

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VIDEO-CD 2ND GENERATION

KB9224

GAIN ADJUSTMENT

Process Summary

The Signal TE1 output by the Tracking Error Amp outputs resistance divide (DC+AC) passes through LPF and the

DC Offset extract signal (DC) difference AMP. Only pure AC components are compared with the pre-selected

Window Comparators Gain select value to carry out the Tracking Gain Adjustment.

The Resistance Divide changes the 5-bit resistance combination with the MICOM Command, to change the Gain.

Tracking Gain Adjustment is carried out in the same conditions as Balance Adjustment, which is: Focus Loop On,

Spindle Servo On, Tracking Servo Off and Sled Servo Off. It adjusts the Tracking Error Amps Gain and the wide-

rage Pick-ups amount of reflection.

The external LPFs Cut-off Frequency is set to 10 Hz ~ 100 Hz.

The Window Comparators comparison level can be chosen from +150 mv ~ +300 mv, and +250 mv ~ +200 mv by

MICOM command.

TGL outputs +150 MV and +250 MV comparator output to TRCNT.

TGH outputs +300 MV and +200 MV comparator output to ISTAT.

Gain Adjustment is complete when the output is H.

Vac < GLI < GHI

GLI < Vac < GHI

GLI < GHI < Vac

TGH

TGL

TE2

LPFT

TE1

I/V Amp

AND

Logic

Controlled by

5 bit switch

(B4~B0)

from MICOM

beam

LPF

GLI

TGL

TGH

TGO

ISTAT

TRCNT

To MICOM

1 K, 103

Resistance

Array

KB9224 Datasheet(PDF) 39 Page - Samsung semiconductor

KB9224 Datasheet(HTML) 39 Page - Samsung semiconductor

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