BA6387K Просмотр технического описания (PDF) - ROHM Semiconductor

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BA6387K

Preservo amplifier for CD players

ROHM Semiconductor 

Optical disc ICs

(1) LOOP ON timing

When FOK turns high, the fall of FE’ is detected and the

FOCUS LOOP turns ON.

FE' (pin31)

0.4V

0.2V

pin8

FZC (internal)

RFO (pin23)

FOK (pin12)

0.3V

FOCUS LOOP ON (internal)

Fig.4 LOOP ON timing

BA6387K

(2) LOOP OFF timing

After FOK turns low, the FOCUS LOOP turns OFF after

the delay T (s) shown in the figure below.

RFO (pin23)

0.3V

FOK (pin12)

pin8

FOCUS LOOP ON (internal)

VB

T

T=14E3 ⋅ C ⋅ In (1+1.5 / VCC) [S]

Fig.5 LOOP OFF timing

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