EL6227C
®
3-Channel Laser Diode Driver w/Oscillator
PRODUCT BRIEF
®
Features
General Description
• Shrink-small outline package
The EL6227C is a high performance three channel laser driver that
provides controlled current to a grounded laser diode. Channels 2 and
3 should 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 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 IIN pin
(virtually ground). The current seen at this pin is then amplified to
• Voltage-controlled output current
source requiring one external set
resistor per channel
• Current-controlled output current
source
• CH2 to 300mA max
• CH3 to 150mA max
• Rise time = 0.8ns
• Fall time = 0.8ns
become a current source at pin IOUT
.
• On chip oscillator with frequency
and amplitude control by use of
external resistors to ground
An on-chip 600MHz oscillator is provided to allow output current
modulation when in any mode. This is turned on when the OSCEN pin
is held high and the OUTENR pin is held low. Complete control of
amplitude and frequency is set by two external resistors connected to
ground at pins RFREQ and RAMP (see graphs in this datasheet for fur-
ther 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 addi-
tional laser diode protection is provided since the OUTEN input will
float high when open. Complete IOUT shutoff is also achieved by hold-
ing the ENABLE pin low, which will override all other control pins.
• Oscillator to 600MHz
• Oscillator to 100mA pk/pk
• Single +5V supply (±10%)
• Disable feature for power-up
protection and power savings
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
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.
Ordering Information
Part No
Temp. Range
Package
Outline #
Connection Diagram
EL6227CU
0°C to +70°C
16-Pin QSOP
MDP0040
1
2
3
4
5
6
7
8
IINR
VCC 16
VCC 15
IOUT 14
GND 13
RAMP 12
IIN2
GND
RFREQ
IIN3
OUTENR ENABLE 11
OUTEN2
OUTEN3
OSCEN 10
VCC
9
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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