參數(shù)資料
型號(hào)： OQ8868
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： Digital Servo Integrated Circuit Silent DSICS
中文描述： SPECIALTY ANALOG CIRCUIT, PQFP44
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 106K
代理商： OQ8868
1997 Feb 12
7
Philips Semiconductors
Product specification
Digital Servo Integrated Circuit Silent
(DSICS)
OQ8868
Fig.3 Detector arrangement.
handbook, halfpage
MGE336
D4
D4
D3
D3
D1
D2
D1
D2
D2
D1
D3
SATELLITE
DIODE R1
SATELLITE
DIODE R1
SATELLITE
DIODE R1
SATELLITE
DIODE R2
SATELLITE
DIODE R2
SATELLITE
DIODE R2
single Foucault
astigmatic focus
double Foucault
For the single Foucault focusing method, the DSICS signal
conditioning can be switched under software control so
that the signal processing is as follows:
D2
–
D2
+
The FE
n
thus obtained is further processed by a
Proportional Integral and Differential (PID) filter section.
A focus OK (FOK) flag is generated by means of the
central aperture signal and an adjustable reference level.
This signal is used to provide extra protection for the TL
generation, and also for the focus start-up procedure and
the drop-out detection.
The radial or tracking error signal is generated by means
of the satellite detector signals S1and S2. The radial error
signal can be formulated as follows:
RE
s
= (S1
S2)
×
RE_gain + (S1 + S2)
RE_offset
where the index ‘s’ indicates the automatic scaling
operation that is performed on the radial error signal. This
scaling is necessary to avoid non-optimum dynamic range
usage in the digital representation and reduces radial
bandwidth spread. Furthermore, the radial error signal will
be made free from offset during start-up of the disc.
The four signals from the central aperture detectors,
together with the satellite detector signals, generate a
track position indication (TPI) signal. This can be
formulated as follows:
TPI = sign[(D1 + D2 + D3 + D4)
(S1 + S2)
×
Sum_gain]
where the weighting factor Sum_gain is generated
internally in the DSICS during initialization.
FE
n
2
D1
×
=
Servo output circuits
The Off Track Detection (OTD) signal indicates an off track
situation. The polarity of this signal is programmable.
During active radial tracking, OTD is realized by
continuously monitoring the off track counter value. The off
track flag becomes valid whenever the off track counter
value is not equal to zero. Depending on the type of
extended S-curve, the off track counter is reset after
3
4
extend or at the original track in the 2
1
4
track extend
mode.
The control signals for the different actuators (FO, RA and
SL) are 1-bit noise-shaped digital outputs at 1.0584 MHz
(DSD mode). At 2.1168 MHz, noise-shaped signals can
also be selected.
An analog representation of the output signals can be
achieved by connecting a first-order low-pass filter to the
outputs.
Focus control
The DSICS digital controller includes the following focus
servo functions:
1.
Focus start-up
2.
Focus position control loop
3.
Dropout detection
4.
Focus loss detection and fast restart
5.
Focus loop gain switching
6.
Focus automatic gain control loop.
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