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CXA1992BR 参数 Datasheet PDF下载

CXA1992BR图片预览
型号: CXA1992BR
PDF下载: 下载PDF文件 查看货源
内容描述: 射频信号处理伺服放大器 [RF Signal Processing Servo Amplifier]
分类和应用: 放大器射频
文件页数/大小: 49 页 / 716 K
品牌: SONY [ SONY CORPORATION ]
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CXA1992BR  
1-1. FS4  
This switch is provided between the focus error input and the focus phase compensation, and is in charge of  
turning the focus servo ON and OFF.  
$00  
$08  
Focus on  
Focus off  
1-2. Procedure of focus activation  
For description, suppose that the polarity is as described below.  
a) The lens is searching the disc from far to near;  
b) The output voltage (Pin 6) is changing from negative to positive; and  
c) The focus S-curve is varying as shown below.  
A
t
Fig. 3. S-curve  
The focus servo is activated at the operating point indicated by A in Fig. 3. Ordinarily, focus searching and the  
turning the focus servo switch ON are performed during the focus S-curve transits the point A indicated in Fig.  
3. To prevent misoperation, this signal is ANDed with the focus OK signal.  
In this IC, FZC (Focus Zero Cross) signal is output from the SENS1 pin (Pin 25) as the point A transit signal.  
In addition, focus OK is output as a signal indicating that the signal is in focus (can be in focus in this case).  
Following the line of the above description, focusing can be well obtained by observing the following timing  
chart.  
(20ms) (200ms)  
$02  
($00)  
$03  
$08  
Drive voltage  
Focus error  
The broken lines in the figure  
indicate the voltage assuming  
the signal is not in focus.  
SENS1  
(FZC)  
The instant when the signal is brought into focus.  
Focus OK  
Fig. 4. Focus ON timing chart  
– 30 –  
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