ELANT EL6242CU, EL6242CL Datasheet
EL6242C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
EL6242C - Product Brief
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
output, allowing the user to create multi-
OUT
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 IIN pin
(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 sampleand-hold amplifier for read and write power control. Its 100MHz
bandwidth and 30ns settling time enable up to 16X CD-RW design.
Connection Diagrams
1
VOUT
2
VREF
3
GND
4
IINR
5
IIN2
6
IIN3
7
RFREQ
8
GND
9
GND
10
WEN3
11
WEN2
12
GND
PDIN
VCC
VCC
IOUT
IOUT
GND
GND
RAMP
ENABLE
OSCEN
VCC
GND
24
23
22
21
20
19
18
17
16
15
14
13
IINR
IIN2
IIN3
RFREQ
GND
GND
WEN3
GND
VREF
VOUT
PDIN
24
23
22
1
2
3
4
5
6
7
8
WEN2
Thermal Pad
9
10
GND
GND
VCC
21
20
19
VCC
18
IOUT
17
IOUT
16
GND
15
GND
14
RAMP
13
ENABLE
11
12
VCC
OSCEN
February 13, 2001
24-Pin QSOP
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.
24-Pin LPP Top View
EL6242C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
EL6242C - Product Brief
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.
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-
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
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 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.
February 13, 2001
2
Printed in U.S.A.
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