MN66279RSC Datasheet, PDF (57/96 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662790RSC
7-1 (5) Automatic adjustment
Following is a list of automatic adjustment.
Command
B7 B6 B5 B4 B3 B2 B1 B0
Description
Table 7-1-5
Time Traverse
required operation
Fo/Tr
offset
AOC
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̌ɹ̌ɹ̍ Averages and corrects the focus error values and 50 ms FWD/
tracking error values as offset when the laser is
to
REV
turned on or off.
140 ms enabled
Fo
balance
ABC1
̍ ̍ɹ̍ɹ̍ɹ̌ɹ̍ɹ̍ɹ̍
Inputs the disturbance into the focus servo loop,
and make corrections so that the envelope ripple
for the 3T component of the RF signal in the
positive and negative parts of the FE signal
should be balanced. The output pin for
corrections is FBAL.
Within
0.5 s
STOP
Tr
balance
ABC2
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̌ɹ̍ɹ̍
The average tracking error value without the
tracking servo is used as a balancing value to
make corrections. The output pin for corrections
is TBAL.
Within
1s
STOP
Fo
rough
gain
AGC1
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̌ɹ̌ Focus search is performed at approx. 5.4 Hz or
1.3 Hz, and the disturbance input amount for the
fine AGC is determined by using focus error S-
curve [P-P] value. The gain will be unchanged.
Set
between
190 ms
and
780 ms
FWD/
REV
enabled
Tr
rough
gain
AGC2
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̌ɹ̍
The [P-P] value of the tracking error in the
tracking servo off status determines the
disturbance input amount for the fine AGC. The
gain will be unchanged.
Set
between
135 ms
and
350 ms
STOP
Fo
fine
gain
FAGC
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̌ Inputs the disturbance into the focus servo loop, Within
and adjusts the gain crossover to the frequency 0.5 s
set by the microcomputer command.
STOP
Tr
fine
gain
TAGC
̍ ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̍ɹ̍ Inputs the disturbance into the tracking servo
loop, and adjusts the gain crossover to the
frequency set by the microcomputer command.
Within
0.5 s
ɹ
STOP
Note) If focus balance adjustment is stopped due to automatic adjustment stoppage or focus failure, only the next
focus pull-in operation will be delayed.
In order to prevent this phenomenon from occurring, it is necessary to write "0" to D2 of the SD (19F2h) after
focus balance adjustment (i.e., after checking that the SENSE is set to low level).
For SD settings, refer to page 38.
SDD00025AEM
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