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參數(shù)資料
| 型號(hào)： | LA9240M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Analog Signal Processor (ASP) for CD players |
| 中文描述： | 模擬信號(hào)處理器（ASP）的CD播放機(jī) |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 321K |
| 代理商： | LA9240M |
11. DEFECT
The mirrored surface level is maintained by the capacitor for LF2 (pin 59); when a drop in the EFM signal (RFSM output)
reaches 0.35 V or more, a high signal is output to DEF (pin 49). If DEF (pin 49) goes high, the tracking servo enters THLD
mode. In order to prevent the tracking servo from entering THLD mode when a defect is detected, prevent DEFECT from
being output by either shorting DEF (pin 49) to GND, or shorting LF2 (pin 59) to GND. The DEFECT output is driven by
constant current (approximately 100 μA).
12. Microprocessor interface
Because the Reset (Nothing) command initializes the LA9240M, it must be used carefully.
The LA9240M command acceptance (mode switching) timing is defined by the internal clock (4.23 MHz divided to 130 kHz)
after the falling edge of CE (RWC); therefore, when commands are sent consecutively, CE must go low for at least 10 μsec.
The 4.23 MHz clock is required for that reason. 2BYTE-COMMAND DETECT and 2BYTE-COMMAND RESET are used
only for the purpose of masking two-byte data.
All instructions can be input by setting CE high and sending commands synchronized with the CL clock from the
microprocessor to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE.
13. Reset circuit
The power-on reset is released when V
CC
exceeds approximately 2.8 V.
14. Pattern design notes
To prevent signal jump-in from CV
+
(pin 40) to RFSM (pin 41), a shielding line is necessary in between.
15. V
CC
/REF/GND/NC
V
CC
1 (pin 64)
V
CC
2 (pin 56)
AGND (pin 22)
DGND (pin 45)
NC (pin 48)
VR (Pin 58)
: RF system
: SERVO system, DIGITAL system
: RF system, SERVO system
: DIGITAL system
: No connection
: Reference voltage
EFM signal
(RFSM output)
LF2 (pin 59)
DEF (pin 49)
Timing
* The DSP pin names are shown in parentheses.
LA9240M
No.5482 - 10/20
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| LA9241M | Analog Signal Processor ASP for CD players |
| LA9242M | Analog Signal Processor ASP for CD Players |
| LA9250M | CD Player Analog Signal Processor (ASP)(用于CD播放器的模擬信號(hào)處理器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA9241M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Analog Signal Processor ASP for CD players |
| LA9242M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Analog Signal Processor ASP for CD Players |
| LA9247T | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CD-ROM Digital Servo RF IC |
| LA9250M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CD Player Analog Signal Processor (ASP) |
| LA9251 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CD Player Analog Signal Processor (ASP) |
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