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): 21/35頁
文件大小: 248K
代理商: HA12188AF
HA12188AF
Rev.1, Oct. 1995, page 21 of 35
Switch FS1 switches a current source to generate the focus search voltage. When switch FS2 is switched
on, focus is acquired by switching switch FS1 on and off.
The current through switch FS1 can be switched in two stages: 36
μ
A sink/18
μ
A source, and 18
μ
A
sink/9
μ
A source.
FS4
FS2
FS1
FSA
DS2
470 k
FPS
FLS
FAC
DRIV.
10
μ
330 k 330 k
56
1
5
6
4
7
8
9
+
+
10
Phase
compen.
18
μ
/
9
μ
7 k
20 k
30 k
90 k
150 k
22 k
0.1
μ
0.047
μ
0.047
μ
Focus
bias adj.
20 k
91 k
×
2.7
Unit R :
C : F
36
μ
/
18
μ
Figure 13 Focus Servo
Gain
Phase
G
50
40
30
20
10
0
10
100k
100
1k
2k
4k
10k
Frequency (Hz)
P
180
108
0
108
180
Note:
Peak frequency of phase compensation is inversely proportional to external resistance value
(330k
at this figure) of pin 7, 8.(dot line : $40 mode, solid line : $42 mode)
Figure 14 Focus Servo Frequency Characteristic (pin 4, 5 are open)
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