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PDF EL6275CU Data sheet ( Hoja de datos )
| Número de pieza | EL6275CU | |
| Descripción | 4-Channel Laser Diode Driver Oscillator | |
| Fabricantes | Elantec Semiconductor | |
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EL6275C - Product Brief
4-Channel Laser Diode Driver + Oscillator
Features
• Shrink-Small Outline Package
• Voltage-controlled output current
source requiring one external set
resistor per channel
• Current-controlled output current
source
• Rise time = 3.0ns
• Fall time = 3.5ns
• 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%)
• Current amplification = 100
• Disable feature for power-up
protection and power savings
• TTL/CMOS control signals
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Ordering Information
Part No
EL6275CU
Package
QSOP-16
Tape & Reel
Outline #
MDP0040
General Description
The EL6275C is a four channel laser diode current amplifier that pro-
vides controlled current to a grounded laser diode. Channels 2, 3, and
4 should be used as the write channels, with switching speeds of
approximately three nanosecond rise/fall time. All four 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
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 shutoff is also achieved by hold-
ing 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 IIN pin can be biased
from a current DAC or other current source.
Connection Diagram
1 IINR
VCC 16
2 IIN2
VCC 15
3 RFREQ
IOUT 14
4 IIN3
GND 13
5 IIN4
RAMP 12
6 OUTEN2 ENABLE 11
7 OUTEN3 OSCEN 10
8 OUTEN4
VCC 9
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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