ELANTEC EL6273CU

3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
Features
General Description
• “Shrink-Small” Outline Package
• Voltage-controlled output current
source to 140mA per channel,
requiring one external set resistor
per channel
• Current-controlled output current
source to 140mA per channel
• Rise time = 3.0ns
• Fall time = 3.5ns
• 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%)
• Current amplification = 400X
• Disable feature for power-up
protection and power savings
• TTL/CMOS control signals
• Fast Settling APC Amplifier
The EL6273C is a high-performance three channel laser driver that
provides controlled current to a grounded laser diode. Three amplifiers
can provide up to 140mA per channel of DC or pulsed current. Channels 2 and 3 should be used as the write channels, with switching
speeds of approximately three nanoseconds 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 400X to become a current source at pin IOUT.
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Ordering Information
Part No
Temp. Range
Package
Outline #
EL6273CU
0°C to +70°C
QSOP-16
MDP0040
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).
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 all other control
pins.
The EL6273C 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. It’s 40MHz bandwidth and 150 ns settling time enable up to 8X CD-RW design.
Connection Diagram
PDIN 16
2 VREF
VCC 15
3 IINR
IOUT 14
4 RFREQ
GND 13
5 IIN2
RAMP 12
6 IIN3
ENABLE 11
7 OUTEN2
OSCEN 10
8 OUTEN3
VCC 9
September 6, 2000
1 VOUT
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.
EL6273C - Product Brief
EL6273C - Product Brief
EL6273C - Product Brief
EL6273C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
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.
September 6, 2000
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.
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.