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EL6255C Datasheet(PDF) 1 Page - Elantec Semiconductor

Part No. EL6255C
Description  4-Channel Laser Diode Driver Oscillator
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Maker  ELANTEC [Elantec Semiconductor]
Homepage  http://www.elantec.com
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EL6255C Datasheet(HTML) 1 Page - Elantec Semiconductor

   
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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.
General Description
The EL6255C is a high-performance four channel laser diode current
amplifier that provides controlled current to a grounded laser diode.
The four amplifiers can provide up to 150 mA per channel of DC or
pulsed current. Channels 2, 3, and 4 must be used as the write chan-
nels, with switching speeds of one nanosecond rise/fall time. All four
channels are summed together at the IOUT output, allowing the user to
create multilevel waveforms in order to optimize laser diode perfor-
mance. 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 by 100X to become a current source at pin IOUT.
An on-chip 500 MHz oscillator is provided to allow current modula-
tion when in the read mode. This is turned on when the OSCEN pin is
held high (floating not recommended). 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). The oscillator will also turn off whenever any of the
OUTEN pins for channels 2, 3, and 4 (the write channels) are low (see
truth table).
Output current pulses are enabled when an ‘L’ signal is applied to the
OUTEN pins. 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 the OUTEN con-
trol pins.
Connection Diagram
Features
• Shrink-small package outline
• Voltage-controlled output current
source to 150 mA per channel,
requiring one external set resistor
per channel
• Current-controlled output current
source to 150 mA per channel
• Rise time = 1.0 ns
• Fall time = 1.1 ns
• On chip oscillator with frequency
and amplitude control by use of
external resistors to ground
• Oscillator to 500 MHz
• Oscillator to 100 mA pk/pk
• Single +5V supply (±10%)
• Current amplification = 100
• Disable feature for power-up
protection and power savings
• TTL/CMOS control signals
Applications
• DVD drives
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Ordering Information
Part No
Temp. Range
Package
Outline #
EL6255CU
0°C to +70°C
QSOP-16
MDP0040
EL6255C - Product Brief
4-Channel Laser Diode Driver + Oscillator
1
2
3
4
16
15
14
13
5
6
7
12
11
10
8
9
VCC
VCC
IOUT
IIN3
RAMP
GND
OUTEN2
ENABLE
VCC
IIN4
OUTEN3
OUTEN4
IIN2
RFREQ
IINR
OSCEN


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