EL6249CU Elantec Inc, EL6249CU Datasheet
![no-image](/images/manufacturer_photos/0/2/216/elantec_inc_sml.jpg)
EL6249CU
Manufacturer Part Number
EL6249CU
Description
Manufacturer
Elantec Inc
Specifications of EL6249CU
Date_code
02
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
EL6249CU
Manufacturer:
EL
Quantity:
2 110
Part Number:
EL6249CU
Manufacturer:
EL
Quantity:
20 000
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.
Features
Applications
Ordering Information
• “Shrink-Small” Outline Package
• Voltage controlled output current
• Auto Oscillator On-Off with
• Rise time = 0.8ns
• Fall time = 0.8ns
• On chip oscillator with frequency
• Oscillator to 500MHz
• Oscillator to 100mA pk/pk
• Single +5V supply (±10%)
• Current amplification = 100
• Disable feature for power-up
• CMOS control signals
• CD-RW applications
• Writable optical drives
• Laser diode current switching
EL6249CU
source, requiring one external set
resistor per channel
OUTEN Signals
and amplitude control by use of
external resistors to ground
protection and power savings
Part No.
Temp. Range
0°C to +70°C
16-Pin QSOP
Package
MDP0040
Outline #
EL6249C - Product Brief
4-Ch Laser Diode Driver + Oscillator
General Description
The EL6249C 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 approxi-
mately one nanosecond rise/fall time. All four channels are summed
together at the I
forms 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
ground). The current seen at this pin is then amplified to become a cur-
rent source at pin I
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 I
ing the ENABLE pin low, which will override the OUTEN control pins.
An on-chip 500MHz oscillator is provided to allow output current mod-
ulation when in read mode. The oscillator is enabled when the OSCEN
pin is held high. If any of channels 2, 3, or 4 are active, the oscillator is
switched off. 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 external I
set each amplifier transconductance by applying a voltage to each resis-
tor, without restriction on the voltage range, thus ensuring broad
voltage DAC compatibility. Alternatively, the I
from a current DAC or other current source.
Connection Diagram
IN
OUT
resistors allow the user to accurately and independently
OUT
output, allowing the user to create multilevel wave-
.
1
2
3
4
5
6
7
8
IINR
IIN2
RFREQ
IIN3
IIN4
OUTEN2
OUTEN3
OUTEN4
OUT
ENABLE
OSCEN
RAMP
IOUT
GND
VCC
VCC
VCC
shutoff is also achieved by hold-
16
15
14
13
12
11
10
9
IN
pin can be biased
IN
pin (virtually