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DP-7010
CIRCUIT DESCRIPTION
7. Servo control CXA1244S (X32-137X-XX : IC10)
CXA1244S
is a bipolar
1C developed
for servo
of
compact
disc (CD) olayers, and it provides the following
functions.
7-1. Terminal connection diagram
OFocus control (search ON/OFF, gain control)
OTracking
control
{servo ON/OFF,
single track jump,
a
!
a
multiple track jump, gain control, phase compensation
ps
:
6
control, brake circuit)
TEO
4
TAO
© Sled control (servo ON/OFF, fast forward, fast
SENSE
5
DIRC
reverse)
C.ouT
6
"
25
sL®
Servo
function
of
each
of
focus,
tracking
and
sled
XRST
7
2
24
SsltO
as well as random
access operation
are realized through
DATA
8
py
23
SLO
control
by microcomputer.
Furthermore,
the serial data
XLT
¢
FEO
ATSC
FS3
VEE
SRCH
7-2. Block diagram
Tracking
4 TG1
gain
uP/
*
J
60uA
60uA
Compa-
rator (4)
<
ie
60uA
30uA
Comparator
(3)
Focus
UP/DOWN
TM1~
TM?
ML LOGIC
O
d
Tracking
ON/OFF
28
DP-7010
CIRCUIT DESCRIPTION
7-3. Explanation of terminals
Terminal No. | Terminal name
|1/O
Functions
24
SL 2)
-|o inverted input of operational amplifier 3.
25
sL®
Non-inverted input of operational amplifier 3.
26
DIRC
TAO
O | Output of operational amplifier 2.
TAO
O | Inverted input of operational amplifier 2.
TG
Tracking amplifier gain switching terminal. GND level.
GND terminal of IC.
Note 1: SENSE terminal output
Serial date] ADORESS |
Note 2 : Digital unit timing chart
a
Focus
|
99090 ° conTROL
4bits|
content
| termine! output
T
7 " H "
when focus zero
cross, Focus erro vot-
* tage 1s OV or higher.
| Used at the time of
| FOCUS PULL opera.
tion
Laie Co Exp 8 oe oP Ee
tu tee
+
TRACKING |
290%
CONTROL
"M4" when the ATSC
| snput tevel exceeds tne
AS
wind comparator
level
){VTM > Vee » 13%)
| Bur this is Not used in
| ths eauioment
Data is loaded at activation ;
CLK
i
|
|
i
TRACKING |
0019 | MooE
Judgement output of
positive or negative of
> tracking zero cross.
«tracking error.
T/fek
When used at the time
% Re
EI,
twek=-—~ = twek
—S
-—tiDe-
; OFAC 1s reduced to
of on detection of
Tzc
| of single track yump,
| "Lon detection of
j72ZC 1. in FWO JUMP
:
,
Execution of instruction
TZC 4 in REV
JUMP
twe
29
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