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EL6257C fiches techniques PDF

Elantec Semiconductor - 4-Channel Laser Diode Driver + Oscillator

Numéro de référence EL6257C
Description 4-Channel Laser Diode Driver + Oscillator
Fabricant Elantec Semiconductor 
Logo Elantec Semiconductor 





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EL6257C fiche technique
EL6257C - Product Brief
4-Channel Laser Diode Driver + Oscillator
Features
• High-performance laser diode
driver
• 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
EL6257CU
Temp. Range
0°C to +70°C
Package
QSOP-24
Outline #
MDP0040
General Description
The EL6257C 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 approximately one nanosecond rise/fall
time. All four channels are summed together at the IOUT output, allow-
ing 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 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 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 the OUTEN con-
trol 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
GND 1
IINR 2
GND 3
IIN2 4
RFREQ 5
IIN3 6
IIN4 7
OUTEN 8
OUTEN2 9
OUTEN3 10
OUTEN4 11
GND 12
24 GND
23 VCC
22 VCC
21 IOUT
20 IOUT
19 GND
18 RAMP
17 ENABLE
16 OSCEN
15 VCC
14 VCC
13 GND
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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