2000 Elantec Semiconductor, Inc.
EL
6272C -
Produ
c
t
B
r
ief
North America: 1-888-352-6832 X 311
Asia: +85-45-682-5820
Europe: +44-18-977-6020
Complete Product Specifications
Elantec Technical Support:
Features
Voltage-controlled output current
source (requiring one external set
resistor)
Current-controlled output current
source.
Rise time = 3.0 ns typ.
Fall time = 3.5 ns typ.
On-chip oscillator w/frequency
and amplitude control by use of
external resistors to ground.
Oscillator to 500 MHz typ.
Oscillator to 100 mA pk/pk typ.
Single +5V supply (10%)
Current amplification = 100
TTL/CMOS control signals
Applications
MO drives
Mini-Disc drives
Writable optical drives
Laser diode current switching
Ordering Information
Part No
Temp. Range
Package
Outline #
EL6272CY
0C to +70C
MSOP10
MDP0043
EL6272C - Product Brief
1-Ch Laser Diode Driver + Oscillator
Jan
uary 31, 2000
General Description
The EL6272C is a single channel laser diode current amplifier that
provides controlled current to a grounded laser diode. The amplifier
can provide up to 200 mA of DC or pulsed current with switching
speeds of approximately three nanoseconds rise/fall time. 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 (virtu-
ally ground). The current seen at this pin is then amplified by 100X to
become a current source at pin I
OUT
.
An on-chip 500 MHz oscillator is provided to allow current modula-
tion when in read mode. This is turned on when the OSCEN pin is held
high. Complete control of amplitude and frequency is set by two exter-
nal resistors connected to ground at pins RFREQ and RAMP (see
graphs in this data sheet for further explanation).
Output write current pulses are enabled when an `L' signal is applied
to the OUTEN pin.
The external resistor allows the user to accurately and independently
set the amplifier transconductance by applying a voltage to the set
resistor, without restriction on the voltage range, thus ensuring broad
voltage DAC compatibility. Alternatively, the I
IN
pin can be biased
from a current DAC or other current source.
Connection Diagram
1
2
3
4
10
9
8
7
5
6
V
CC
I
OUT
GND
RAMP
V
CC
ENABLE
I
IN
RFREQ
OUTEN
OSCEN
2
EL6272C - Product Brief
1-Ch Laser Diode Driver + Oscillator
EL627
2C
- Produ
c
t
General Disclaimer
Specifications contained in this product brief are in effect as of the publication date shown. Elantec Semiconductor, Inc. reserves the right to make
changes in the circuitry or specifications contained herein at any time without notice. Elantec Semiconductor, 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 Semiconductor, Inc. products are not authorized for and
should not be used within Life Support Systems without the specific
written consent of Elantec Semiconductor, Inc. Life Support sys-
tems are equipment intended to support or sustain life and whose
failure to perform when properly used in accordance with instruc-
tions provided can be reasonably expected to result in significant
personal injury or death. Users contemplating application of Elantec
Semiconductor, Inc. Products in Life Support Systems are requested
to contact Elantec Semiconductor, Inc. factory headquarters to
establish suitable terms & conditions for these applications. Elantec
Semiconductor, Inc.'s warranty is limited to replacement of defec-
tive 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) 352-6832 (toll free)
Fax:
(408) 945-9305
European Office: 44-18-977-6020
Jan
uary 31, 2000
Printed in U.S.A.
Japan Office:
85-45-682-5820
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