el6273cu ETC-unknow, el6273cu Datasheet
el6273cu
Manufacturer Part Number
el6273cu
Description
3-channel Laser Diode Driver W/oscillator Amplifier
Manufacturer
ETC-unknow
Datasheet
1.EL6273CU.pdf
(2 pages)
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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.
Features
Applications
Ordering Information
• “Shrink-Small” Outline Package
• Voltage-controlled output current
• Current-controlled output current
• Rise time = 3.0ns
• Fall time = 3.5ns
• On chip oscillator with frequency
• Oscillator to 500MHz
• Oscillator to 100mA pk/pk
• Single +5V supply (±10%)
• Current amplification = 400X
• Disable feature for power-up
• TTL/CMOS control signals
• Fast Settling APC Amplifier
• CD-RW applications
• Writable optical drives
• Laser diode current switching
EL6273CU
Part No
source to 140mA per channel,
requiring one external set resistor
per channel
source to 140mA per channel
and amplitude control by use of
external resistors to ground
protection and power savings
Temp. Range
0°C to +70°C
QSOP-16
Package
MDP0040
Outline #
EL6273C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
General Description
The EL6273C is a high-performance three channel laser driver that
provides controlled current to a grounded laser diode. Three amplifiers
can provide up to 140mA per channel of DC or pulsed current. Chan-
nels 2 and 3 should be used as the write channels, with switching
speeds of approximately three nanoseconds rise/fall time. All three
channels are summed together at the I
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 I
amplified by 400X to become a current source at pin I
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 I
holding the ENABLE pin low, which will override all other control
pins.
The EL6273C 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. It’s 40MHz band-
width and 150 ns settling time enable up to 8X CD-RW design.
Connection Diagram
IN
pin (virtually ground). The current seen at this pin is then
1
2
3
4
5
6
7
8
VOUT
VREF
IINR
RFREQ
IIN2
IIN3
OUTEN2
OUTEN3
ENABLE
OUT
OSCEN
RAMP
PDIN
IOUT
GND
OUT
VCC
VCC
shut-off is also achieved by
16
15
14
13
12
11
10
9
output, allowing the user to
OUT
.
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el6273cu Summary of contents
Page 1
... Part No Temp. Range Package Outline # EL6273CU 0°C to +70°C QSOP-16 MDP0040 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. © ...
Page 2
EL6273C - Product Brief 3-Channel Laser Diode Driver w/Oscillator & APC Amplifier General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir- ...