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5
1.1.2 SPDL Circuit
For the SPDL motor for the DVD mechanism module, a brush motor which is used for the CD mechanism module is adopted
instead of a brushless motor which is used for the conventional DVD mechanism module.
The SPDL circuit to drive the brush motor is as shown below.
66 MD
IC1501
MN2DS0018MA
1.1.3 FE Generating Circuit
Focus Error (FE) Generating Circuit
Signals FE1 and FE2 from PU will be AD converted and imported to IC1501. Then, taking the offset cancel into
consideration and taking the differential, FE is generated.
FE = (FE1) - (FE2)
CN1101
Input AMP
VIN8
116
FE2
21
Gain switching
-6dB, 0dB, 9.5dB
VIN7
20
115
FE1
After 10 bit ADC
1+Pfbal0,1/0x0100
FE1
Fbal coarse
Offset Cancel
adjustment value
1-Pfbal0,1/0x0100
FE2
5
6
Buffer
LPF
LPF
50k Hz
G=0dB
LPF
50k Hz
MN2DS0018MA LSI
FE signal generating circuit
AMP
+
-
MN2DS0018MA LSI
CX-3283
6
7
IC1251
26 OPIN3-
25 OPOUT3
16 VO3-
15 VO3+
ADC drive AMP
Buffer AMP
Selector
Selector
Gain switching
3dB 9dB
FE
7
8
MOTOR
ADC
ADC
Gain switching
6/7.5/9/10.5 dB
8
A
B
C
D
E
F
3
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