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(yè)數(shù)： 20/35頁(yè)
文件大小： 248K
代理商： HA12188AF
HA12188AF
Rev.1, Oct. 1995, page 20 of 35
7. Bias
The 12-k
external resistor on pin 36 sets the reference value of the IC’s internal bias current. Use only
this resistance value. The IC will not operate correctly with other resistance values.
Pin 35 is for a bypass capacitor to eliminate noise from the IC’s internal bias circuits.
Bias
35
36
12 k
0.1
μ
Unit R :
C : F
Figure 11 Bias
8. APC
This circuit is for the Psub laser diode. The APC circuit is switched off when pin 28 is high.
APC
LDS
46
47
28
–
+
1 k
Unit R :
Figure 12 APC
9. Focus Servo System
The focus error signal is led in through a gain-control resistor to pin 56. Focus bias is adjusted at pin 56.
When a defect is detected, switch DS2 propagates the focus error signal, which is integrated by an internal
resistor and external capacitor. Switch DS2 also inverts the phase of the propagated signal.
Switch FS4 is the focus servo loop switch.
Switch FLS switches low frequency filter, thereby switching the AC gain of the servo.
Switch FPS switches the peak phase-compensation frequency. This switch is linked with switch FLS and
tracking servo switches TLS and TPS. For example this switch is off at normal, double speed and is on at
quadruple speed.
The DC gain from input at pin 56 to output at pin 9 is 19dB. Figure 14 shows the frequency characteristic
when pin 4, 5 are open.
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