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.

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Features

· Shrink-Small Outline Package
· Voltage-controlled output current

source requiring one external set

resistor per channel

· Rise time = 0.8ns
· Fall time = 0.8ns
· On chip oscillator with frequency

and amplitude control by use of
external resistors to ground

· Oscillator to 500MHz
· Oscillator to 100mA pk/pk
· Single +5V supply (±10%)
· Disable feature for power-up

protection and power savings

· Fast Settling APC Amplifier

Applications

· CD-RW applications
· Writable optical drives
· Laser diode current switching

Ordering Information

Part No.

Temp. Range

Package

Outline #

EL6242CU

0°C to +70°C

QSOP-24

MDP0040

EL6242CL

0°C to +70°C

LPP-24

MDP0046

General Description

The EL6242C is a high-performance three channel laser driver that
provides controlled current to a grounded laser diode. Write channels
2 and 3 should be used as the write channels, with switching speeds of
approximately one nanosecond rise/fall time. All three channels are
summed together at the I

OUT

output, allowing the user to create multi-

level waveforms in order to optimize laser diode performance. The
level of the output current is set by an analog voltage applied to an
external resistor which converts the voltage into a current at the I

(virtually ground). The current seen at this pin is then amplified to
become a current source at pin I

OUT

An on-chip 500MHz oscillator is provided to allow output current
modulation when in any mode. This is turned on when the OSCEN pin
is held high. Complete control of amplitude and frequency is set by
two external resistors connected to ground at pins RFREQ and RAMP
(see graphs in this data sheet for further explanation).

The EL6242C also includes a fast settling APC amplifier designed to
interface directly with the front end monitor diode and the sample-
and-hold amplifier for read and write power control. Its 100MHz
bandwidth and 30ns settling time enable up to 16X CD-RW design.

VREF

GND

VOUT

IINR

IIN2

IIN3

RFREQ

GND

WEN3

WEN2

GND

PDIN

VCC

IOUT

GND

RAMP

ENABLE

OSCEN

VCC

GND

Connection Diagrams

2
4

2
3

2
2

2
1

2
0

1
0

1
1

1
2

24-Pin LPP Top View

Thermal Pad

IINR

IIN2

IIN3

RFREQ

GND

WEN3

VCC

IOUT

GND

RAMP

ENABLE

G
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G
N

V
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24-Pin QSOP

EL6242C - Product Brief

3-Channel Laser Diode Driver w/Oscillator & APC Amplifier

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EL6242C - Product Brief

3-Channel Laser Diode Driver w/Oscillator & APC Amplifier

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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 cir-
cuitry 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.

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 sup-
port 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 con-
templating 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. Elan-
tec, Inc.'s warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.

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Printed in U.S.A.

Elantec Semiconductor, Inc.

675 Trade Zone Blvd.

Milpitas, CA 95035

Telephone: (408) 945-1323

(888) ELANTEC

Fax:

(408) 945-9305

European Office: +44-118-977-6020
Japan Technical Center: +81-45-682-5820

Part Number EL6242C