®
EL6119
Data Sheet
June 15, 2004
FN7208
Dual 4-Channel Laser Diode Driver +
Oscillator
The EL6119 is a dual four-channel
laser diode current amplifier that
provides controlled current to both a
CD and DVD laser diode. Channels 2, 3, and 4 should be
used as the write channels, with switching speeds of
approximately one nanosecond rise/fall time. All four
channels are summed together at the I
OUT
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 I
IN
pin
(virtually ground). The current seen at this pin is then
amplified to become a current source at pin I
OUT
.
Output current pulses are enabled when an ‘L’ signal is
applied to the WEN pin. No output current flows when WEN
is ‘H’ and additional laser diode protection is provided since
the WEN input will float high when open. Complete I
OUT
shutoff is also achieved by holding the ENABLE pin low,
which will override the WEN control pins.
Each laser driver has a separate ENABLE pin to allow total
shutdown of each laser driver when not in use.
An on-chip 500MHz oscillator is provided to allow output
current modulation when in read mode. The oscillator is
enabled when the OSCEN pin is held high. Complete control
of amplitude and frequency is set by two external resistors
connected to ground at pins R
FREQ
and R
AMP
(see graphs
in this data sheet for further explanation).
Features
• Leadless plastic package
• Voltage controlled output current source, requiring one
external set resistor per channel
• Rise time = 0.8ns
• Fall time = 0.8ns
• 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%)
• Disable feature for power-up protection and power savings
• CMOS control signals
Applications
• CD + DVD Combo applications
• Writable optical drives
• Laser diode current switching
Ordering Information
PART
NUMBER
EL6119CL
EL6119CL-T13
PACKAGE
32-Pin QFN
32-Pin QFN
TAPE & REEL
-
13”
PKG. DWG. #
MDP0046
MDP0046
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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