參數(shù)資料
型號(hào)： SAA7371GP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital servo processor and Compact Disc decoder CD7
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： 14 X 14 MM, 2.70 MM HEIGHT, PLASTIC, MS-022, SOT-393-1, QFP-64
文件頁(yè)數(shù)： 29/60頁(yè)
文件大?。?/td> 247K
代理商： SAA7371GP
1998 Jul 06
29
Philips Semiconductors
Product specification
Digital servo processor and
Compact Disc decoder (CD7)
SAA7371
7.14.8.4
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.
7.14.8.5
Hi-level status
The read hi-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.
7.14.9
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.
7.14.10 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.
7.14.11 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(guān)PDF資料
PDF描述
SAA7372 Digital servo processor and Compact Disc decoder CD7
SAA7373 Digital servo processor and Compact Disc decoder CD7
SAA7373GP Digital servo processor and Compact Disc decoder CD7
SAA7374 Low voltage digital servo processor and Compact Disc decoder CD7LV
SAA7374GP Low voltage digital servo processor and Compact Disc decoder CD7LV
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7372 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7373 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7373GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7374 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV
SAA7374GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV
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