Laser Driver Oscillator
General Description
• Low power dissipation
• User-selectable frequency from
60MHz to 600MHz controlled
with a single resistor
• User-specified amplitude from
10mA pk-pk to 100mA pk
controlled with a single resistor
• Auto turn-off threshold
• Soft edges for reduced EMI
• Small 5-pin SOT23 package
The EL6203C is a push-pull oscillator used to reduce laser noise. It
uses the standard interface to existing ROM controllers. The frequency and amplitude are each set with a separate resistor connected
to ground. The tiny package and harmonic reduction allow the part to
be placed close to a laser with low RF emissions. An auto turn-off feature allows it to easily be used on combo CD-RW plus DVD-ROM
DVD players
DVD-ROM drives
CD-RW drives
MO drives
General purpose laser noise
5-Pin SOT23
Tape & Reel
One external resistor sets the oscillator frequency. Another external
resistor sets the oscillator amplitude. If the APC current is reduced
such that the average laser voltage drops to less than 1.1V, the output
and oscillator are disabled, reducing power consumption to a
The current drawn by the oscillator consists of a small bias current,
plus the peak output amplitude in the positive cycle. In the negative
cycle the oscillator subtracts peak output amplitude from the laser
APC current.
This part is pin-compatible to the EL6201C. It is superior to the
EL6201C in several ways: It has up to 100mA output capability, it is
more power-efficient, it has less harmonic content, and it has an auto
shut-off feature activated at 1.1V.
Ordering Information
Part No
EL6203C - Product Brief
EL6203C - Product Brief
Outline #
The part is available in the space-saving 5-pin SOT23 package. It is
specified for operation from -0°C to 70°C.
Connection Diagram
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
September 27, 2001
5-Pin SOT23
EL6203C - Product Brief
EL6203C - Product Brief
Laser Driver Oscillator
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described
herein and makes no representations that they are free from patent infringement.
September 27, 2001
WARNING - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.
Elantec Semiconductor, Inc.
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Milpitas, CA 95035
Telephone: (408) 945-1323
(408) 945-9305
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