Elantec EL6253C 3-channel laser diode driver oscillator Datasheet

3-Channel Laser Diode Driver + Oscillator
Features
General Description
• Ultra-Small Package Outline
• Voltage-controlled output current
source to 120 mA per channel,
requiring one external set resistor
per channel
• Current-controlled output current
source to 120 mA per channel
• Rise time = 1.0 ns
• Fall time = 1.1 ns
• On chip oscillator with frequency
and amplitude control by use of
external resistors to ground
• Oscillator to 500 MHz
• Oscillator to 100 mA pk/pk
• Single +5V supply (±10%)
• Current amplification = 100
• Disable feature for power-up
protection and power savings
• TTL/CMOS control signals
•
The EL6253C is a high-performance three channel laser diode current
amplifier that provides controlled current to a grounded laser diode.
Amplifiers R and 2 can provide up to 120 mA per channel of DC or
pulsed current whereas amplifier 3 can provide up to 240 mA. Channels 2 and 3 must be used as the write channels, with switching speeds
of approximately one nanosecond rise/fall time. All three channels are
summed together at the IOUT output, allowing the user to create multilevel 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 by
100X to become a current source at pin IOUT.
Applications
Output current pulses are enabled when an ‘L’ signal is applied to the
OUTEN pin. No output current flows when OUTEN is ‘H’, and additional laser diode protection is provided since the OUTEN input will
float high when open. Complete IOUT shut-off is also achieved by
holding the ENABLE pin low, which will override the OUTEN control pins.
•
•
•
•
CD-RW applications
MO drives
Writable optical drives
Laser diode current switching
Ordering Information
Part No
Temp. Range
Package
Outline #
EL6253CU
0°C to +70°C
QSOP-16
MDP0041
EL6253C - Product Brief
EL6253C - Product Brief
An on-chip 500 MHz oscillator is provided to allow current modulation when in the read mode. This is turned on when the OSCEN pin is
held high (floating not recommended). 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 oscillator will also turn off whenever any of the
OUTEN pins for channels 2 or 3(the write channels) are low (see truth
table).
The external resistors allow the user to accurately and independently
set each amplifier transconductance by applying a voltage to each
resistor, without restriction on the voltage range, thus ensuring broad
voltage DAC compatibility. Alternatively, the IIN pin can be biased
from a current DAC or other current source.
Connection Diagram
IINR
1
16
VCC
IIN2
2
15
VCC
3
14
IOUT
4
13
GND
IIN3
5
12
RAMP
OUTEN R
6
11
ENABLE
OUTEN2
7
10
OSCEN
OUTEN3
8
9
VCC
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.
April 9, 1999
GND
RFREQ
EL6253C - Product Brief
EL6253C - Product Brief
3-Channel Laser Diode 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.
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.
April 9, 1999
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
2
Printed in U.S.A.
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