EL6245C
®
EL6245C
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
PRODUCT BRIEF
®
Features
• “Shrink-Small” outline package
• Voltage-controlled output current
source, requiring one external set
resistor per channel
• Auto oscillator on-off with
OUTEN signals
• 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
General Description
The EL6245C is a high performance three-channel laser driver that
provides controlled current to a grounded laser diode. 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
IN
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 only when the
OSCEN and OUTEN pins are held high. Complete control of ampli-
tude 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).
Output current pulses are enabled when an ‘L’ signal is applied to the
OUTEN pin. No output current flows when OUTEN is ‘H’, and addi-
tional laser diode protection is provided since the OUTEN input will
float high when open. Complete I
OUT
shut-off is also achieved by
holding the ENABLE pin low, which will override all other control
pins.
The EL6245C 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.
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Ordering Information
Part No.
EL6245CU
Temp. Range
0°C to +70°C
Package
16-Pin QSOP
Outline #
MDP0041
Connection Diagram
1 VOUT
2 VREF
3 IINR
4 IIN2
5 IIN3
6 RFREQ
7 OUTEN3
8 OUTEN2
PDIN 16
VCC 15
IOUT 14
GND 13
RAMP 12
ENABLE 11
OSCEN 10
VCC 9
September 4, 2002
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-ELANTEC or 408-945-1323
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Elantec ® is a registered trademark of Elantec Semiconductor, Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
EL6245C
EL6245C
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
PRODUCT BRIEF
Effective May 15, 2002, Elantec, a leader in high performance analog products, is now a part of Intersil Corporation.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications
at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by
Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any
infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any
patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
®
Sales Office Headquarters
September 4,
NORTH AMERICA
Intersil Corporation
7585 Irvine Center Drive
Suite 100
Irvine, CA 92618
TEL: 949-341-7000
FAX: 949-341-7123
Elantec
675 Trade Zone Blvd.
Milpitas, CA 95035
TEL: 408-945-1323
800: 888-ELANTEC
FAX: 408-945-9305
EUROPE
Intersil Europe Sarl
Avenue William Fraisse 3
1006 Lausanne
Switzerland
TEL: +41-21-6140560
FAX: +41-21-6140579
ASIA
Intersil Corporation
Unit 1804 18/F Guangdong Water Bldg.
83 Austin Road
TST, Kowloon Hong Kong
TEL: +852-2723-6339
FAX: +852-2730-1433
Printed in U.S.A.
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