CXA1992 SONY [Sony Corporation], CXA1992 Datasheet - Page 48

• Manufacturer Part Number: CXA1992
• Description: RF Signal Processing Servo Amplifier
• Manufacturer: SONY [Sony Corporation]

Notes on Operation
1. Focus OK circuit
1) Refer to the "Description of Operation" for the time constant setting of the focus OK amplifier LPF and the
2) The equivalent circuit for the output pin (FOK) is shown in the diagram below.
The FOK and comparator output are as follows:
2. Sled amplifier
The sled amplifier may oscillate when used by the buffer amplifier. Use with a gain of approximately 20dB.
3. Focus/Tracking internal phase compensation and reference design material
4. Laser Poser Control
The RF level is stabilized by attaching an offset to the APC V
RF level fluctuations.
The laser life is shortened by increasing the laser power when the less light is reflected from the disc.
It is recommended that the typical laser power value is set lower to maintain the laser life.
Take care of the laser maximum ratings when using the laser power control circuit.
mirror amplifier HPF.
1.2kHz gain
1.2kHz phase
1.2kHz gain
1.2kHz phase
2.7kHz gain
2.7kHz phase
Output voltage High : V
Output voltage Low : V
Item
08
08
25
25
25
25
FOKH
FOKL
SD
13
13
≈ Vsat (NPN) + V
≈ near Vcc
Measurement pin
13
6
EE
– 48 –
C
C
C
100k
40k
FLB
FGD
TGU
L
Conditions
and controlling the laser power in sync with the
= 0.1µF
= 0.1µF
= 0.1µF
V
EE
V
20k
V
CC
EE
–125
–130
Typ.
21.5
26.5
63
13
FOK
27
V
CC
Unit
R
deg
deg
deg
dB
dB
dB
L
CXA1992AR