CXA1372BQ_BS.pdf

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CXA1372BQ/BS
RF Signal Processing Servo Amplifier for CD Player
Description
The CXA1372BQ/BS is a bipolar IC developed for
RF signal processing (focus OK, mirror, defect
detection, EFM comparator) and various servo
control.
CXA1372BQ
48 pin QFP (Plastic)
CXA1372BS
48 pin SDIP (Plastic)
Features
• Dual ±5V and single 5V power supplies
• Low power consumption
• Fewer external parts
• Disc defect countermeasure circuit
• Fully compatible with the CXA1182 for microcomputer
software
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
V CC – V EE
12
V
• Operating temperature
Topr
–20 to +75 °C
Functions
• Auto asymmetry control
• Focus OK detection circuit
• Mirror detection circuit
• Defect detection, countermeasure circuit
• EFM comparator
• Focus servo control
• Tracking servo control
• Sled servo control
• Storage temperature
Tstg
–65 to +150 °C
• Allowable power dissipation
P D 457 (CXA1372BQ) mW
833 (CXA1372BS) mW
Recommended Operating Conditions
V CC – V EE
3.6 to 11
V
V CC – D GND 3.6 to 5.5
V
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
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CXA1372BQ/BS
Block Diagram
36
35 34
33
32
31
30
29
28
27
26
25
• IIL
¯
• TTL
24
DATA
CB
37
CP
38
23
XLT
RFI
39
• TTL
¯
• IIL
22
CLK
RFO
40
21
LOCK
• IIL DATA REGISTER
• INPUT SHIFT REGISTER
• ADDRESS DECODER
• TTL
¯
• IIL
DV EE
41
20
DIRC
• OUTPUT DECODER
TZC
42
• FS1 to 4 • TG1 to 2 • TM1 to 7 • PS1 to 3
DFCT
19
AV EE
43
TG1
TE
• TRACKING
PHASE COMPENSATION
18
SSTOP
TDFCT
44
TM1
• I SET
• F SET
17
ISET
FSET
ATSC
45
• BPF • WINDOW COMPARATOR
16
• FOCUS
PHASE
COMPENSATION
TM6
FZC
46
TM5
15
SL–
FE
47
DFCT
FS1
TM7
FDFCT
48
TM4
14
SLO
TM3
13
SL+
FS4
TM2
FS3
FS2
TG2
1
2
3
4
5
6
7
8
9
10
11
12
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CXA1372BQ/BS
Pin Configuration
CXA1372BQ
36 35 34
33
32
31
30
29
28
27
26
25
CB
37
24
DATA
CP
38
23
XLT
RFI
39
22
CLK
RFO
40
21
LOCK
DV EE
41
20
DIRC
TZC
42
19
AV EE
TE
43
CXA1372BQ
18
SSTOP
TDFCT
44
17
ISET
ATSC
45
16
FSET
FZC
46
15
SL–
FE
47
14
SLO
FDFCT
48
13
SL+
1
2
3
4
5
6
7
8
9 10 11 12
CXA1372BS
48
47
46
45
44
43
42
41
40 39 38 37 36 35 34
33
32
31
30
29
28
27
26
25
CXA1372BS
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
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CXA1372BQ/BS
Pin Description
Pin No.
Symbol I/O
Equivalent circuit
Description
Q S
1
7
VC
I
Center voltage input.
For dual power supplies: GND
For single power supply:
(V CC + GND)/2
Vcc
147
48k
Connects a capacitor between this
pin and Pin 3 to cut high-frequency
gain.
2
8
FGD
I
2
130k
20µA
V EE
46k
580k
The high-frequency gain of the
focus servo is switched through FS3
ON and OFF.
3
9
FS3
I
3
4
10
FLB
I
40k
External time constant to boost the
low frequency of the focus servo.
4
5
11
FEO
O
Focus drive output.
11
17
TAO
O
5
11
14
250µA
Tracking drive output.
2.5µA
14
20
SLO
O
Sled drive output.
90k
147
6
12 FE–
I
6
Inverted input for focus amplifier.
40k
2.5µA
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CXA1372BQ/BS
Pin No.
Symbol I/O
Equivalent circuit
Description
QS
147
External time constant for forming
the focus search waveforms.
7
13
SRCH
I
7
50k
3.5µA
11µA
110k
20k
External time constant for selecting
the tracking high-frequency gain.
8
14
TGU
I
8
82k
147
External time constant for selecting
the tracking high-frequency gain.
9
15
TG2
I
9
470k
90k
TA–
147
12
18
I
12
Inverted input for tracking amplifier.
3µA
11µA
10k
Non-inverted input for sled amplifier.
13
19
SL+
I
13
15
21
SL–
I
147
Inverted input for sled amplifier.
15
3µA
22µA
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