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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)： | 13/35頁 |
| 文件大?。?/td> | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 13 of 35
2. RF and Focus Error Pre-Amplifiers
The main beam output signals from the photodiode IC are led in through resistors at pins 43 and 44. The
outputs of amplifiers RF1 and RF2 are summed by amplifier RFS to generate the EFM RF signal. (*1)
External resintances of pins 43 and 44 and amplifier RFS should be set according to the pick-up so that the
RF signal at pin 38 is about 1.5 V
OP
(the difference between the peak level of 11T signal component and the
voltage at no signal).
Switches RS1 and RS2 operate together under microprocessor control. For example they are on for normal
or double speed, and off for quadruple speed. ON resistance of RS1 is 1.1k
typ and on resistance of RS2
is 530
typ.
Figure 3-A shows the frequency characteristic at pin 38 in the condition of figure 3.(Input resistances of
pins 43 and 44 are 10k
.)
External resistances and capacitances should be fitted according to the pick-up. Stray capacitances of board
print patterns have influence on this frequency characteristic. Therefore external resistances and
capacitances should be set considering stray capacitances.
Amplifier FE subtracts the output of amplifier RF2 from the output of amplifier RF1 to generate the focus
error signal. The gain is 0dB. The focus error signal is output as the output of amplifier FA at pin 55, with a
gain set by variable resistor VR and the external resistance values. With the external resistors in figure 3,
the gain of amplifier FA is 8.7dB (initial value after reset).
Variable resistor VR is controlled by 3-bit data. The gain can be varied from –5dB to +7dB with respect to
the reset value.
The focus error signal is binarized by comparator FZC, with a Vth equal to V
C
+ 0.38V.
A reference voltage of 1/2 V
CC
is output at pin 45. The IC’s internal reference voltage is connected
internally.
The feedback resistance of amplifier FA should be set according to the pick-up so that the focus S-curve at
pin 55 is about 3V peak-to-peak.
Note: 1
The sink current of amplifier RFS is about 1mA. When load capacitance of pin 38 is big because
of wiring with CD DSP LSI etc, please use buffer amplifier. (for example emitter follower
transistor)
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