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Circuit Descriptions, Abbreviation List, and Datasheets
9.5
Laconic
The main function of the LACONIC, IC7300 is to control the
laser power. The IC forms a closed control loop in combination
with the Elantec located on the OPU. It compensates aging and
temperature of the laser. Furthermore it forms a fingerprint
correction loop. It also acts as bridge between IIC and serial
bus of the Elantec laser driver on the OPU.
9.6
Optical Pick-up Unit
The OPU66 is a dual laser Optical Pick-up Unit for DVD+RW/
+R. It consists of a 3-D actuator for focusing, redial tracking and
tilt correction.
•
650nm laser for DVD
•
780nm laser for CD
On the interconnecting flex several electrical components are
mounted.
•
Elantec
•
Paedic
•
Eeprom
The laser control and diode signal processor ICs together with
an EEPROM are mounted on the OPU flex.
The laser control IC generates the DVD laser read and writing
signals needed for reading DVD discs and writing DVD+RW /
+R discs (write strategies of DVD+RW / +R discs).
The diode signal processor is an analogue pre-processor
adapted for the CD and CD-R / RW read function.
The EEPROM contains information about writing current,
writing strategies and other parameters belonging to the OPU.
9.7
Motor and Servo drivers
A Servo Driver is implemented to control the sledge. Several
motor driver ICs are incorporated to control the Tray, Disc and
Turntable motors,
Driver ICs are incorporated for control of the:
•
Actuator
•
Disc Motor
•
Sledge Motor
•
Tray Motor
programmable laser diode power
driver
integrated photo detector with
programmable gain pre-amplifier
containing a number of values
representing adjustments belonging to
the OPU.
VAD 8031
9.
EN 33
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