cxa1372bs Sony Electronics, cxa1372bs Datasheet - Page 14

• Manufacturer Part Number: cxa1372bs
• Description: Rf Signal Processing Servo Amplifier For Cd Player
• Manufacturer: Sony Electronics

Tracking Sled Servo
The above figure shows a block diagram of the tracking and sled servo.
The capacitor connected between Pins 8 and 9 is a time constant to cut the high-frequency gain when TG2 is
OFF. The peak frequency of the tracking phase compensation is approximately 1.2kHz when a 510k
resistance connected to Pin 16.
To jump tracks in FWD and REV directions, turn TM3 or TM4 ON. During this time, the peak voltage applied to
the tracking coil is determined by the TM3 or TM4 current and the feedback resistance from Pin 12. To be
more specific,
The FWD and REV sled kick is performed by turning TM5 or TM6 ON. During this time, the peak voltage
applied to the sled motor is determined by the TM5 or TM6 current and the feedback resistance from Pin 15;
The values of the current for each switch are determined by the resistance connected between Pin 17 and
GND. When this resistance is 120k :
This current value is almost inversely proportional to the resistance and the variable range is approximately 5
to 40µA at TM3.
SSTOP is the ON/OFF detection signal for the limit SW of the linear motor's innermost track.
As is the case with the FE signal, the TE signal is switched to pass through a low-pass filter formed by the
internal resistance (470k ) and the capacitor connected to Pin 44.
TM-1 was ON at DFCT in the CXA1082 and CXA1182, but it does not operate in the CXA1372.
0.033µ
TE
Track jump peak voltage = TM3 (or TM4) current
Sled kick peak voltage = TM5 ( or TM6) current
TM3 ( or TM4) = ±11µA, and TM5 (or TM6) = ±22µA.
22k
0.022µ
0.047µ
0.1µ
45
42
44
43
8
9
470k
TGU
TG2
ATSC
TDFCT
TZC
TE
BPF
470k
TG2
20k
680k
DFCT
100k
100k
1k
1k
TM1
TG1
TZC
10k
TG1
Tracking
Phase
Compensation
16
ATSC
680K
SSTOP
66P
FSET
0.01µ
510k
TM7
TM6
TM5
10k
– 14 –
TM4
TM3
11µA
22µA
11µA
22µA
90k
feedback resistance
feedback resistance
1k
100k
10k
TM2
18
15
13
12
11
14
SSTOP
SLO
SL+
SL–
TA–
TAO
100k
100k
120k
TRACKING
COIL
82k
22µ
3.3µ
SLED MOTOR
0.015µ
15k
CXA1372BQ/BS
8.2k
M