cxa1982q Sony Electronics, cxa1982q Datasheet - Page 28

• Manufacturer Part Number: cxa1982q
• Description: Rf Signal Processing Servo Amplifier For Cd Players
• Manufacturer: Sony Electronics

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
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 120k
the oscillation may be occurred in the ISET block.
1) High gain: Resistance between FE pins (pins 6 and 7) 100k
2) Low gain: A signal, whose resistance is divided between Pins 1 and 2, is input to FE.
1) Refer to the “Description of Operation” for the time constant setting of the focus OK amplifier LPF and the
2) The equivalent circuit of the output pin (FOK) is as shown below.
The FOK and comparator output are as follows:
V
V
Output voltage High: V
Output voltage Low: V
The external variable resistor of TEO pin is used for TE.
The anti-shock circuit always operates in the CXA1982Q so that TG1 and TG2 (address 1 : D3) should
be set to 1 for tracking adjustment to prevent this effect.
When the anti-shock function is not used, Pin 45 (ATSC) should be fixed to VC.
mirror amplifier HPF.
IH
IL
V
V
CC
CC
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) 100k
FOKL
FOKH
Vsat (NPN)
near V
CC
– 28 –
to 240k . If the resistance value is out of this range,
100k
40k
1
2
V
EE
Large
V
20k
V
CC
EE
Large
FOK
25
V
CC
R
L
CXA1982Q