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C I R C U I T B E S C H I P T I O N
Component
Use/Function
Operation/Condition/Compatibility
o14
2 S C 9 4 5 ( A ) ( O . P )
R i p p l e f i l t e r
Transistor ripple filter for constant-voltage regulated VDD supply circuit
f o r F L d r i v e r s l C s ( l C 1 2 t o l C l b ) .
u t 3
2SA1 286
R i p p l e f i l t e r
Transistor ripple filter for constant-voltage laser power supply circuit.
Cl
z>L5240
Current buffer
Current buffer for disc motor driver circuit.
7
2SA1286
C u r r e n t b u f f e r
Current buffer for disc motor driver circuit.
o
25C945(A)(O,P)
S w i t c h
I n v e r t s t h e l o g i c o f p r e - d i g i t a l S W .
0 1 9
2 S A 7 3 3 ( A ) ( O , P )
S w i t c h
C o n n e c t s r h e l o w m u t i n g p o t e n t i a l i n D A C u n i t t o G N D .
o20
2 S C 9 4 5 ( A ) ( O , P )
Switch
Control SW used to set r12V regulated DAC unit power to tOV.
421
2S,A1286
Current buffer
Current buffer for focus actuator driver circuit.
422
2SD1 266
Current buffer
Current buffer for focus actuator driver circuit-
o23
z>u I zoo
B i p p l e f i l t e r
Transistor ripple filter for + 12V regulated DAC unit powersupply circuit.
o24
2 5 8 9 4 1 ( P )
R i p p l e f i l t e r
Transistor ripple filter lor -12V regulated DAC unit power supply circuit
D,I
r J J t / o
S w i t c h
P r e i i g i t a l S W .
D2
1 S S 1 7 6
S w i t c h
D i o d e S W u s e d f o r k e y s c a n n i n g i n t e s t m o d e .
D3
1 S S l 7 6
Switch
T i m e - c o n s t a n t S W f o r q u i c k d i s c h a r g e o t C 4 E .
D4
1 S S 1 7 6
S w i t c h
U s e d t o p r e v e n t v a r i a t i o n o f M U T E a n d E M p H d i g i t a l a u d i o d a t a d u r i n g
s e a r c h i n g , e t c .
D 5
R D 6 . 8 E S ( 8 2 )
Z e n e r d i o d e
Provides reference potential for constant-voltage regutated V6p supply
c i r c u i t f o r F L d r i v e r l C s ( 1 C 1 2 t o l C 1 5 ) .
D6,D7
D S M 1 A 1
R e c t i f i e r d i o d e s
U s e d f o r v o l t a g e m u l t i p l y i n S r e c t i f i e r .
D8
R D 8 . 2 E S ( B )
Z e n e r d i o d e
U s e d t o m a i n t a i n F L d i s p ay erase potential
n o
1 SS1 76
S w i t c h
Diode SW used to interrupt optical output while the digital output sw is oFF.
O F F .
D l 0
B D 2 . 7 E S ( B }
S w i t c h
Used to decrease r12V DAC power quickly when power is turned OFF.
D l 1
R D 6 . 2 J S ( 8 2 )
Z e n e r d i o d e
P r o v i d e s r e f e r e n c e p o t e n t i a l f o r r 1 2 V r e g u l a t e d D A C p o w e r s u p p l y c i r c u i t .
D l 2 - D i 5
r J J | / O
S w i t c h
D i o d e S W u s e d f o r c o u n t e r m e a s u r e a g a i n s t s t a t i c e l e c t r i c i t y i n d i g i t a l o u t p u t .
D 1 6 . D 1 7
1 S S 1 7 6
S w i t c h
Q i o d e u s e d f o r c o u n t e r m e a s u r e a g a i n s t s t a t i c e l e c t r i c i t y .
D 1 8 - D 2 0
1 SS1 76
S w i t c h
D i o d e S W c o n n e c t e d t o l i m i r S W .
D21
R D 5 . 6 E S ( 8 2 )
Z e n e r d i o d e
Provides reference potential for -5V laser oower.
D22
1B 4841
B e c t i f i e r d i o d e
f i e c t i f i e r d i o d e b r i d g e f o r s e r v o a n d d i g i t a l l i n e s .
D23
1B 4B'41
F e c t i f i e r d i o d e
R e c t i f i e r d i o d e b r i d g e f o r D A C l i n e .
D24
1 S V 1 4 7
V a r i - c a p
V a r i - c a p i n V C O c i r c u i t o f P L L .
Table 1-3
2. Circuit description
2-1. DAC Interface circuit (X25-2860-11)
T h e d i g i t a l l i n e a n d a n a l o g l i n e o f t h e D p - 3 3 0 0 D a r e
s e p a r a t e d b y t r a n s m i t t i n g D A C d i g i t a l a u d i o d a t a u s i n g
photocouplers. Although the photocouplers are of the high_
s p e e d t y p e , t h e p h o t o c o u p l e r o u t p u t s s t i l i i n c l u d e a t i m e
l a g o f a p p r o x . 2 0 n s . T o c o m p e n s a t e f o r t h i s d e l a y , a n
inverter is used with BCK and two inverters are used with
1 7 6 . 5 k H 2 u s e d f o r L A T C H s i g n a l .
tc14
(Digital filter)
DAC
to DATA (Lch}
DAC
to DATA (Rch)
DAC
tO BCK
DAC
to LATCH
Ftu
FIJ'
r ;
$ B i
; v
T
Fig.2-1 DAC Interface circuit
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