EL6288C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
Features
General Description
• Shrink-Small Package Outline
The EL6288C 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
• 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
• Fast Settling APC Amplifier
become a current source at pin IOUT
.
An on-chip 500MHz 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 RFREQ and RAMP
(see graphs in this data sheet 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 addi-
tional laser diode protection is provided since the OUTEN input will
float high when open. Complete IOUT shut-off is also achieved by
holding the ENABLE pin low, which will override all other control
pins.
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
The EL6288C also includes a fast settling APC amplifier designed to
interface directly with the front end monitor diode and the sample-
and-hold amplifier for read and write power control. Its 100MHz
bandwidth and 30ns settling time enable up to 16X CD-RW design.
Ordering Information
Part No
Temp. Range
Package
Outline #
EL6288CU
0°C to +70°C
QSOP-16
MDP0041
Connection Diagram
1
2
3
4
5
6
7
8
VOUT
VREF
IINR
PDIN 16
VCC 15
IOUT 14
IIN2
GND 13
IIN3
RAMP 12
ENABLE 11
OSCEN 10
RFREQ
OUTEN3
OUTEN2
9
VCC
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
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