EL6253C - Product Brief
EL6253C
- Product Brief
3-Channel laser diode Driver + Oscillator
Features
•
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
•
General Description
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. Chan-
nels 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 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 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 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).
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 the OUTEN con-
trol pins.
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 I
IN
pin can be biased
from a current DAC or other current source.
Applications
•
•
•
•
CD-RW applications
MO drives
Writable optical drives
Laser diode current switching
Ordering Information
Part No
EL6253CU
Temp. Range
0°C to +70°C
Package
QSOP-16
Outline #
MDP0041
Connection Diagram
January 31, 2000
I
INR
I
IN2
GND
RFREQ
I
IN3
OUTEN R
OUTEN2
OUTEN3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Complete Product Specifications
Elantec Technical Support:
North America: 1-888-352-6832 X 311
Asia: +85-45-682-5820
Europe: +44-18-977-6020
©2000 Elantec Semiconductor, Inc.
V
CC
V
CC
I
OUT
GND
RAMP
ENABLE
OSCEN
V
CC
EL6253C - Product
EL6253C - Product Brief
3-Channel laser diode Driver + Oscillator
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.
January 31, 2000
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
Japan Office:
85-45-682-5820
2
Printed in U.S.A.
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