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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)： | 25/35頁 |
| 文件大小： | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 25 of 35
12. Sled Servo
The signal output at pin 16 is passed through a low-pass filter and input at pin 17. TM2 is the loop switch
of the sled servo.
TM5 and TM6 are current switches that generate voltages for large movements of the sled. A positive
voltage appears at pin 19 when TM5 is switched on. A negative voltage appears at pin 19 when TM6 is
switched on.
The current values through switches TM5 and TM6 can be selected in four steps: 8
μ
A, 16
μ
A, 24
μ
A, and
32
μ
A.
TM5 TM6
TM2
SSA
SLM
DRIV.
17
18
+
19
–
+
56 k
6.8 k
0.22
μ
12 k
82 k
22
μ
Unit R :
C : F
TM2 on resistsnce 230
typ
Figure 19 Sled Servo
13. Direct Control
The switches in the tracking control and sled servo control blocks can be switched on and off by
microprocessor commands. TM1 to TM6 can also be controlled directly by the DC pin after input of serial
data from the microprocessor.
When the microprocessor sends a command from $20 to $2F as serial data with DC high, TM1 to TM6 are
placed in the states indicated under ST1 in table 2. Next, when DC is driven low, the states change to ST2.
When DC is brought high again, the states change to ST3.
Example of using the DC terminal for 1 track jump is as follows.
For inside track jump, after sending the $2C at DC = “H”, when the TZC’s rising edge is detected set DC =
“L” and set DC = “H” after a setting time.
For outside track jump, after sending the $28 at DC = “H”, when the TZC’s falling edge is detected, set DC
= “L” and set DC = “H” after a setting time.
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