CXA1782 SONY [Sony Corporation], CXA1782 Datasheet - Page 30

• Manufacturer Part Number: CXA1782
• Description: RF Signal Processing Servo Amplifier for CD players
• Manufacturer: SONY [Sony Corporation]

Notes on Operation
1. FSET pin
2. ISET pin
3. FE (focus error)/TE (tracking error) gain changing method
4. Input voltage at Pins 19 to 22 of the microcomputer interface should be as follows:
5. Focus OK circuit
6. Sled amplifier
Sled/Tracking internal phase compensation and reference design material
The FSET pin determines the fc for the focus and tracking high-frequency phase compensation.
ISET current = 1.27V/R
Use the setting resistance within the range of 120kΩ to 240kΩ. If the resistance value is out of this range,
the oscillation may be occurred in the ISET block.
1) High gain: Resistance between FE pins (pins 6 and 7) 100kΩ
2) Low gain: A signal, whose resistance is divided between Pins 1 and 2, is input to FE. The internal gain
1) Refer to the “Description of Operation” for the time constant setting of the focus OK amplifier LPF and the
The FOK and comparator output are as follows:
The sled amplifier may oscillate when used by the buffer amplifier. Use with a gain of approximately 20dB.
V
V
Output voltage High: V
Output voltage Low: V
mirror amplifier HPF.
1.2kHz gain
1.2kHz phase
1.2kHz gain
1.2kHz phase
2.7kHz gain
2.7kHz phase
IH
IL
V
V
CC
CC
Item
10% or less
90% or more
= Focus search current
= Tracking jump current
= Sled kick current ($1X: PS1 = PS0 = 0)
Resistance between TE pins (pins 12 and 13) 100kΩ
adjustment circuit is used for TE.
08
08
25
25
25 13
25 13
FOKL
FOKH
SD
Vsat (NPN)
near V
Measurement pin
CC
13
6
– 30 –
100k
C
C
40k
C
FLB
FGD
TGU
1
2
Conditions
= 0.1µF
= 0.1µF
= 0.1µF
V
EE
Large
V
20k
V
CC
EE
Large
–125
–130
Typ.
21.5
26.5
63
13
FOK
25
Unit
deg
deg
deg
dB
dB
dB
V
CC
R
L
CXA1782CQ/CR