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參數(shù)資料
| 型號(hào)： | 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)： | 24/35頁 |
| 文件大?。?/td> | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 24 of 35
Figure 17 shows the phase relationships of Mirror, the tracking error, TZC, and COUT. TM7 operates to
prevent the moving direction component of the tracking error signal from reaching the actuator.
The purpose of switches TM3 and TM4 is to generate the track jump voltage. A positive voltage appears at
pin 16 when TM3 is switched on. A negative voltage appears at pin 16 when TM4 is switched on.
The current values through switches TM3 and TM4 can be selected in four steps: 8
μ
A, 16
μ
A, 24
μ
A, and
32
μ
A. The DC gain from input at pin 2 to output at pin 16 is 13dB. Figure 16 shows the frequency
characteristic when pin 11, 12 are open.
Tracking error
Mirror
TZC
COUT
(a) Moving inward
(b) Moving outward
Figure 17 Phase Relationships of Mirror and Other Signals
11. DRT
DRT is an output signal that indicates the inward or outward direction. In the example in figure 18, DRT is
low during motion from outer toward inner tracks, and high for motion in the reverse direction. This signal
is output from pin 20 on command from the microprocessor.
RF
DRT
(moving outward)
(moving inward)
H
L
Figure 18 DRT
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