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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General Description
The EL6281C is a combination read + 3 write level laser driver with
IV amplifier. A dual amplitude, dual frequency RF oscillator sums on
the output for laser noise reduction during read or write. All these
functions are provided in 24-lead QSOP and LPP packages.
The ENABLE pin enables the read & write channels. Positive current
supplied to the IIN lines, through user selected resistors, allow the full
scale range of each amplifier to be matched to the full scale range of
the users control DACs. When the WEN pins are switched low, the
respective current is summed to the output with 1ns rise and fall times.
The 100mA
P-P
(max) oscillator is switched on and off by the OSCEN
line. The R/W line allows the oscillator to operate at one amplitude
and frequency when R/W is high, and another amplitude and fre-
quency when R/W is low.
The entire chip is powered down when ENABLE is low. The user can
calibrate the gain of the I/V amplifier. With a slew rate around
200V/s, the I/V amplifier can normally settle to less than 1% within
30ns.
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16
15
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5
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Connection Diagram
VREF
IINR
VOUT
IIN2
RFREQ1
IIN3
IIN4
RFREQ2
RWB
GND
WEN4
WEN3
PDIN
VCC
VCC
IOUT
GND
GND
RAMP1
RAMP2
ENABLE
OSCEN
VCC
WEN2
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18
17
16
15
14
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4
2
3
2
2
2
1
2
0
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0
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1
1
2
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4
5
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24-Pin LPP Top View
Thermal Pad
IIN2
RF1
IIN3
IIN4
RF2
RWB
GND
VCC
IOUT
GND
GND
RAMP1
RAMP2
ENABLE
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R
V
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V
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3
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2
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Features
Read + 3 Write Channel laser
driver with oscillator & fast I/V
amplifier
Rise time = 0.8 nsec
Fall time = 0.8 nsec
200V/s I/V amplifier
100X gain, 100mA low noise read
channel
200X gain, 200mA write channel
Two 100X gain, 100mA write
channels
500MHz, 100mA
P-P
Oscillator
with dual frequency and amplitude
control
3.3V compatible logic signals
Single +5V supply
Applications
CD-RW to 16X
CD-R to 32X
Writable Optical Disk Drives
Ordering Information
Part No.
Temp. Range
Package
Outline #
EL6281CU
0C to +70C
QSOP-24
MDP0040
EL6281CL
0C to +70C
LPP-24
MDP0046
EL6281C - Product Brief
4-Channel Laser Driver with APC Amp
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EL6281C - Product Brief
4-Channel Laser Driver with APC Amp
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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-
cuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described
herein and makes no representations that they are free from patent infringement.
WARNING - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment intended to sup-
port or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant personal injury or death. Users con-
templating application of Elantec, Inc. Products in Life Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elan-
tec, Inc.'s warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.
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Printed in U.S.A.
Elantec Semiconductor, Inc.
675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: (408) 945-1323
(888) ELANTEC
Fax:
(408) 945-9305
European Office: +44-118-977-6020
Japan Technical Center: +81-45-682-5820
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