參數資料
型號： SAA7377GP
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Force/Pressure transducer; Compensated; Pressure Range: 0 to 25 psi
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
文件頁數： 27/56頁
文件大?。?/td> 311K
代理商： SAA7377GP
1998 Jul 06
27
Philips Semiconductors
Product specifications
Digital servo processor and Compact Disc
decoder (CD7)
SAA7377
7.13.8.4
Automatic sequencers and timer interrupts
Two automatic sequencers are implemented (and must be
initialized after power-on):
1.
Autostart sequencer: controls the start-up of focus,
radial and motor.
2.
Autostop sequencer: brakes the disc and shuts down
servos.
When the automatic sequencers are not used it is possible
to generate timer interrupts, defined by the
time_parameter coefficient.
7.13.8.5
High-level status
The read high-level status command can be used to obtain
the interrupt, decoder, autosequencer status registers and
the motor start time. Use of the read high-level status
command clears the interrupt status register, and
re-enables the subcode read via a servo command.
7.13.9
D
RIVER INTERFACE
The control signals (pins RA, FO and SL) for the
mechanism actuators are pulse density modulated. The
modulating frequency can be set to either 1.0584 MHz
(DSD mode) or 2.1168 MHz; controlled via the xtra_preset
parameter. An analog representation of the output signals
can be achieved by connecting a first-order low-pass filter
to the outputs.
During reset (i.e. RESET pin is held LOW) the RA, FO and
SL pins are high impedance.
7.13.10 L
ASER INTERFACE
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_preset parameter; the pin is automatically driven if the
focus control loop is active.
7.13.11 R
ADIAL SHOCK DETECTOR
The shock detector (see Fig.21) 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.
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 band-pass
filter (controlled by sledge_parm1); lower corner frequency
can be set at either 0 or 20 Hz, and upper corner
frequency at 750 or 1850 Hz. The shock detector is
switched off automatically during jump mode.
Fig.21 Block diagram of radial shock detector.
handbook, full pagewidth
RE
MGC914
SHOCK
OUTPUT
HIGH-PASS FILTER
(0 or 20 Hz)
LOW-PASS FILTER
(750 or 1850 Hz)
AMPLITUDE
DETECTION
相關PDF資料
PDF描述
SAA7377 Digital servo processor and Compact Disc decoder CD7
SAA7378GP Single Chip Digital Servo Processor and Compact Disc Decoder
SAA7380 Error correction and host interface IC for CD-ROM ELM
SAA7380GP Error correction and host interface IC for CD-ROM ELM
SAA7381 ATAPI CD-R block decoder
相關代理商/技術參數
參數描述
SAA7377GP/M1,518 功能描述:IC DIGITAL PROCESSOR/CD7 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064
SAA7378GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single Chip Digital Servo Processor and Compact Disc Decoder
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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