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參數(shù)資料
| 型號： | LA9251M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | CD Player Analog Signal Processor (ASP)(用于CD播放器的模擬信號處理器) |
| 中文描述： | CD播放機(jī)模擬信號處理器（ASP）的（用于光盤播放器的模擬信號處理器） |
| 文件頁數(shù)： | 14/17頁 |
| 文件大小： | 152K |
| 代理商： | LA9251M |
10. Focus Detection
The pickup is seen as being in focus when, after a VR + 0.2 V level is detected in the focus error signal S-curve, that
S-curve next goes to the VR level.
11. Defect Detection
The mirror surface level is held by the capacitor on LF2 (pin 59), and DEF (pin 51) goes high if a drop in the EFM
signal (RF output) exceeds about 0.35 V. When DEF goes high, the tracking servo goes to THLD mode. When a
defect is detected applications can prevent the LA9251M from going to THLD mode either by setting DEF to low or
by setting LF2 (pin 59) low and thus setting the LA9251M not to output DEF.
12. Oscillator Circuit
The oscillator frequency is set by the external RC circuit attached to OSC (pin 31). This oscillator frequency is used
as the reference clock for focus search and E/F balance adjustment.
No. 6125-14/17
LA9251M
Focus
REF + 0.2 V
A12226
EFM signal
(RFSM output)
LF2 (pin 59)
DEF (pin 51)
0.35 V
A12227
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