BA6387K 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6387K

Preservo amplifier for CD players

ROHM Semiconductor 

Optical disc ICs

(4) DET block

BA6387K

RFO

+

−

15

vsc

+

37k 88k

−

14

Bottom hold (long)

Charging current 0.1µA

Bottom hold (short)

Charging current 1µA

Peak hold (long)

Peak hold (short)

Discharging current 0.1µA Discharging current 1µA

1.2V

17.8p

30p

9

19

3300p

20

3300p

Fig.7 DET block

PL-VSC

BL + (PL - BL) ⋅ 37k ⋅ (37k + 88k)

Peak hold (long) (PL)

Bottom hold (long) (BL)

Peak hold (short) (PS)

Bottom hold (short) (BS)

Mirror

Defect

Fig.8 Defect and mirror generation

When defect is high, the bottom hold (long) charging

current is 50µA. The scratch depth (VSC) can be adjusted

by changing the resistance at pin 9.

VSC =

12

R9 + 200

× 4k

The peak hold voltage will not go below (GND + 0.9V)

and the bottom hold voltage will not go below (VCC –

0.9V).

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