cxa1992ar Sony Electronics, cxa1992ar Datasheet - Page 19

• Manufacturer Part Number: cxa1992ar
• Description: Rf Signal Processing Servo Amplifier
• Manufacturer: Sony Electronics

The difference between E I-V amplifier output VE and F I-V amplifier output VF is taken and output from TEO.
The tracking error amplifier has built-in balance and gain adjustment circuits to enable software-based
automatic adjustment.
The balance adjustment is performed by varying the combined resistance value of the T-configured feedback
resistance at the E I-V amplifier.
Vary the combined resistance value of the E I-V amplifier's feedback resistance by using the balance
adjustment switches (BAL1 to BAL4).
The gain adjustment is performed by resistance dividing the TE AMP output by the gain adjustment switches
(TOG1 to TOG4).
The balance and gain adjustment switches are controlled with commands.
Set the cut-off frequency of the external LPF between 10Hz to 100Hz.
Tracking Error Amplifier
E
F
E I-V AMP feedback resistance = R1 + R4 +
F I-V AMP feedback resistance = R2 + R5 +
42
41
F I-V AMP
E I-V AMP
VC
VC
12p
C2
260k
12p
C1
R2
260k
VF
VE
R1
VC
43
EI
26k
R3
6.8k
VC
13k
R5
R4
17k
R8
17k
R9
V
R13
R12
13k
96k
R14
13k
VC
NORMAL
GAIN UP
GAIN UP
NORMAL
TE AMP
TGFL
TGFL
RE
R16
96k
R18
7.5k
VC
TEO
R1
R2
45
0.01µ
100k
C3
R23
R22
1.5k
RE
R3
GND
– 19 –
R4
R5
0.01µ
150k
R24
C4
GND
= 403k
+
–
46
300mV
LPFI
VC
VC
VC
VC
20mV
–20mV
400mV
VIN
VIN
VH
VH
VL
VL
VIN > VL H
VIN < VL L
VIN > VL H
VIN < VL L
VIN > VH L
VIN < VH H
VIN > VH L
VIN < VH H
COMAND
CONTROL
CONTROL
BALH
BALL
TGH
TGL
COMAND
SENS
SELECTOR
23
20
25
26
22
21
SENS2
SENS1
XRST
CLK
DATA
XLT
CXA1992AR
CPU