EL6272C - Product Brief
EL6272C - Product Brief
1-Ch Laser Diode Driver + Oscillator
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
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.
Applications
•
•
•
•
MO drives
Mini-Disc drives
Writable optical drives
Laser diode current switching
Ordering Information
Part No
EL6272CY
Temp. Range
0°C to +70°C
Package
MSOP10
Outline #
MDP0043
Connection Diagram
ENABLE 1
I
IN
2
RFREQ 3
OUTEN 4
OSCEN 5
10 V
CC
9 I
OUT
8 GND
7 RAMP
6 V
CC
January 31, 2000
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.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
