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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)： | 16/35頁 |
| 文件大?。?/td> | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 16 of 35
3. Tracking Pre-Amplifiers
The sub-beam outputs from the photodiode IC are led in through resistors at pins 48 and 49.
External resistances of pins 48 and 49 and amplifier TE should be set according to the pick-up so that the
traverse signal at pin 52 is about 2 V
PP
.
After a reset, the initial value of the feedback resistance BAL from amplifier TR1 to pin 48 is 400k
, the
same as the feedback resistance from amplifier TR2 to pin 49.
BAL has a variable resistance value that is controlled by 4-bit data. The variable range is from –32% to
+28% of the reset value. This resistance can be varied to adjust the EF balance of the tracking error.
Amplifier TE generates the tracking error signal. Its input signals are received from the preceding stage
through variable resistors VR. With the external resistor values in figure 5, after a reset, the initial value of
the gain is 8.8dB.
The variable VR resistance is controlled by 3-bit data. The gain can be varied from –5dB to +7dB with
respect to the reset value.
The tracking error signal is coupled through a capacitor to input pin 53 and binarized by comparator TZC,
with a Vth equal to V
C
. (*1)
Note: 1
At normal speed the output of amplifier TE contains much EFM signal components. Therefore
the output of amplifier TE had better be led in through LPF for reduction of EFM signal
components at pin 53.
TR1
TR2
TE
TZC
BAL
48
49
50
–
+
VR
–
+
51
52
–
+
–
+
53
62 k
62 k
75 k
VR
3.6 p
3.6 p
400 k
0.022
μ
Unit R :
C : F
Figure 5 Tracking Pre-Amplifiers
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