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FN7229
EL6224
3-Channel Laser Diode Driver w/
Oscillator
The EL6224 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 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
.
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. 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 datasheet for further 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 additional laser diode protection is
provided since the OUTEN input will float high when open.
Complete I
OUT
shutoff is also achieved by holding the
ENABLE pin low, which will override all other control 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.
Features
"Shrink-Small" outline package
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
On-chip oscillator with frequency and amplitude control by
use of external resistors to ground
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
Ordering Information
PART
NUMBER
PACKAGE
TAPE & REEL PKG. DWG. #
EL6224CU
16-Pin QSOP
-
MDP0040
EL6224CU-T7
16-Pin QSOP
7"
MDP0040
EL6224CU-T13 16-Pin QSOP
13"
MDP0040
Data Sheet
June 16, 2004
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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EL6224
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