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.

General Description

The EL6205C consists of a variable amplitude, push only, oscillator

that also supplies the laser DC current. It is designed to easily interface

to existing ROM controllers, reducing parts count, and power

dissipation.

The reduction of parts count and the small package allows the oscillator

to be placed closer to the laser, thus reducing EMI. Also, the turn-on

and turn-off edges are slew rate limited to reduce higher harmonics.

The total current drawn from the power supply can be less than the laser

threshold current due to the unique push-only modulation method. The

average current is less than the peak oscillator current, and can be less

than half of the oscillator current. The power control current supplied

from the main board is reduced from many tens of mA to less than

2mA.

One external resistor sets the oscillator frequency. A current applied to

the IIN terminal determines the amplitude of the oscillator and laser DC

current. If the oscillator amplitude is set very low, the output and oscil-

lator are disabled. The part is available in the space-saving 6-pin SOT23

package. It is specified for operation from -0

°C to 70°C.

Connection Diagram

1

2

3

6

4

EL6205C

(6-Pin SOT23)

IOUT

RFREQ

VDD

GND2

GND1

IN

5

Features

• Low power dissipation

• Reduced parts count from the

conventional solution

• User-selectable frequency from

60MHz to 600MHz controlled

with a single resistor

• User-selectable amplitude from

10mA pk-pk to 100mA pk-pk

controlled by 0.2mA to 2mA input

current

• Auto turn-off threshold

• Soft edges for reduced EMI

• Small 6-pin SOT23 package

Applications

• DVD players

• DVD-ROM drives

• Combo drives

• MO drives

• General purpose laser noise

reduction

• Local oscillator capability

Ordering Information

Part No.

Package

Tape & Reel

Outline #

EL6205CW

6-Pin SOT23

MDP0038

EL6205C - Product Brief

Laser Driver Oscillator