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參數(shù)資料
| 型號： | SAA7378GP |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Single Chip Digital Servo Processor and Compact Disc Decoder |
| 中文描述： | 單片機數(shù)字伺服處理器和光盤解碼器 |
| 文件頁數(shù)： | 25/45頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SAA7378GP |
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Philips Semiconductors
Preliminary specification: Version 1.0
May 1995
25
Digital Servo Processor and Compact Disc Decoder (CD7)
SAA7378GP
8.7
During active radial tracking, off track detection has been realised by continuously monitoring the off track counter value.
The off track flag becomes valid whenever the off track counter value is unequal to zero. Depending on the type of extended
S-curve the off track counter is reset after 0.75 extend or at the original track in the 2.25 track extend mode.
Off Track Detection
8.8
The control signals (pins RA, FO and SL) for the mechanism actuators are pulse density modulated. The modulating
frequency can be set to either 1.0584MHz (DSD mode) or 2.1168MHz; controlled via the xtra_presetparameter. An analog
representation of the output signals can be achieved by connecting a first order low pass filter to the outputs.
During reset (ie. RESET pin is held low) the RA, FO and SL pins are high impedance.
Driver Interface
8.9
The LDON pin (open drain output) is used to switch the laser off and on; when the laser is on the output is high impedance.
The action of the LDON pin is controlled by the xtra_presetparameter; the pin is automatically driven if the focus control loop
is active.
Laser Interface
8.10
The shock detector (block diagram shown in Figure 18) can be switched on during normal track following; and detects within
an adjustable frequency whether disturbances in the radial spot position relative to the track exceed an adjustable level
(controlled by shock_level). Every time the radial tracking error (RE) exceeds this level the radial control bandwidth is
switched to twice its original bandwidth and the loop gain is increased by a factor of 4.
Radial Shock Detector
The shock detection level is adjustable in 16 steps from 0 to 100% of the traverse radial amplitude which is sent to an
amplitude detection unit via an adjustable bandpass filter (controlled by sledge_parm1); lower corner frequency can be set
at either 0 or 20Hz, and upper corner frequency at 750 or 1850Hz. The shock detector is switched off automatically during
jump mode.
Figure 18 Block Diagram of Shock Detector
RE
High pass filter
(0 or 20Hz)
Amplitude
detection
Shock
out
Low pass filter
(750 or 1850Hz)
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相關(guān)代理商/技術(shù)參數(shù) |
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| SAA7380 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Error correction and host interface IC for CD-ROM ELM |
| SAA7380GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Error correction and host interface IC for CD-ROM ELM |
| SAA7381 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ATAPI CD-R block decoder |
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| SAA7382GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Error correction and host interface IC for CD-ROM ELM |
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