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參數(shù)資料
| 型號： | HA12188AF |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Pre-Amplifier and Servo IC for Quadruple-Speed CD-ROM |
| 中文描述： | 預(yù)放大器和四人間伺服集成電路高速的CD - ROM |
| 文件頁數(shù)： | 22/35頁 |
| 文件大?。?/td> | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 22 of 35
The transform function of phase compen block at figure 13 is as follows.
VOUT
VIN
8.95
1+j
ω
(2.7
×
10
–
6
)
≈
1+j
ω
1+j
ω
7.9
×
10
–
9
I
5.6
×
10
–
10
I
5.6
×
10
–
10
I
(
(
(
)
)
)
≈
tan
-1
ω
7.9
×
10
–
9
I
(
)
–
tan
-1
ω
–
tan
-1
ω
(2.7
×
10
–
6
)
at FPS OFF
I
7
or I
8
≈
V
CC
–
0.71V
External resistance value of pin 7 or 8
I = I
7
at FPS ON
I = 2.7 I
8
10. Tracking Servo System
The tracking error signal is led in through a gain-control resistor to pin 2.
When a defect is detected, switch DS1 propagates the tracking error signal, which is integrated by an
internal resistor and external capacitor. Switch DS1 also inverts the phase of the propagated signal.
Switch TM1 is the tracking servo loop switch.
Switch TLS switches low frequency filter, thereby switching the AC gain of the servo.
The purpose of switch THS is to raise the high-frequency gain.
Switch TPS switches the peak phase-compensation frequency. This switch is linked with switch TLS and
focus servo switches FLS and FPS. For example this switch is off at normal, double speed and is on at
quadruple speed.
Switch TM7 is turned on by taking the logical AND of COUT and microprocessor data, to improve the
performance of the pick-up. COUT is a signal generated by latching Mirror with both edges of TZC.
DS1
V
CC
TM1
THS
18 p
TM3 TM4
TM7
TSA
TPS
TLS
TAC
DRIV.
2
15
3
11
12
13
14
–
+
16
Phase
compen.
22 k
100 k
100 k
100 k
167 k
100 k
0.1
μ
33 k
470 k
0.1
μ
0.1
μ
18 p
330 k 330 k
Unit R :
C : F
×
2.7
Figure 15 Tracking Servo
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