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OQ8868 Datasheet

Digital Servo Integrated Circuit Silent DSICS

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INTEGRATED CIRCUITS
DATA SHEET
OQ8868
Digital Servo Integrated Circuit
Silent (DSICS)
Product specification
Supersedes data of 1996 Apr 11
File under Integrated Circuits, IC01
1997 Feb 12


NXP Semiconductors Electronic Components Datasheet

OQ8868 Datasheet

Digital Servo Integrated Circuit Silent DSICS

No Preview Available !

Philips Semiconductors
Digital Servo Integrated Circuit Silent
(DSICS)
Product specification
OQ8868
FEATURES
The DSICS realizes the following servo functions:
Focus servo loop
Radial servo loop
Built-in access procedure
Sledge motor servo loop
Three line (TDA1301T-like; same on hardware level,
coefficients differ) or I2C-bus serial interface with system
controller.
Other features are:
Single supply voltage (5 V)
Flexible system oscillator
Usable for single/double Foucault and astigmatic focus
Wide range of adjustable servo characteristics possible
Automatic focus start-up procedure and in-lock
indication
Fast focus restart procedure
Sophisticated track loss detection mechanism
Extended radial error signal
Automatic initialization and jump procedure for radial
servo
Automatic radial error gain and offset control
Sophisticated defect detector
Shock detector
Fast serial communication
Low noise servo loops
Automatic gain control for the complete focus and radial
loop
Fast track counting signal input
Steered sledge jump
Radial actuator damping.
Features that improve on its predecessor, the TDA1301T:
Low noise in the focus loop
Faster serial communication
Improved jump performance.
Added features are:
High level watchdogs
Decoder (LO9585, LO9588 or HD60) communication
support
Application debugging support
Pulsed sledge mode
Auto gain control on radial and focus loop
I2C-bus serial communication
Externally available defect detector signals.
GENERAL DESCRIPTION
The Digital Servo Integrated Circuit Silent (DSICS) IC
provides all servo functions except the spindle motor
control in two-stage Compact Disc (CD) systems. It offers
a high degree of integration, combined with the low
additional cost of external components. The servo
characteristics are widely adjustable by means of a
three-wire serial interface, which offers great flexibility for
the application of different CD mechanisms.
The servo chip accepts diode currents and drives various
power stages. Proper functioning of the focus and radial
AGCs requires a digital power stage (SZA1010). It can
drive normal, CDM12-like, mechanisms.
It is the improved version of its predecessor, the DSIC2
(TDA1301).
ORDERING INFORMATION
TYPE
NUMBER
OQ8868
PACKAGE
NAME
DESCRIPTION
QFP44 plastic quad flat package; 44 leads (lead length 1.3 mm); body
10 × 10 × 1.75 mm
VERSION
SOT307-2
1997 Feb 12
2


Part Number OQ8868
Description Digital Servo Integrated Circuit Silent DSICS
Maker NXP
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