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
• Read + 3 Write Channel laser
• Rise time = 0.8 nsec
• Fall time = 0.8 nsec
• 200V/µs I/V amplifier
• 100X gain, 100mA low noise read
• 200X gain, 200mA write channel
• Two 100X gain, 100mA write
• 500MHz, 100mA
• 3.3V compatible logic signals
• Single +5V supply
• CD-RW to 16X
• CD-R to 32X
• Writable Optical Disk Drives
EL6281CU
EL6281CL
Part No.
driver with oscillator & fast I/V
amplifier
channel
channels
with dual frequency and amplitude
control
Temp. Range
0°C to +70°C
0°C to +70°C
P-P
QSOP-24
Package
LPP-24
Oscillator
MDP0040
MDP0046
Outline #
EL6281C - Product Brief
4-Channel Laser Driver with APC Amp
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
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/µs, the I/V amplifier can normally settle to less than 1% within
30ns.
Connection Diagram
10
11
12
1
2
3
4
5
6
7
8
9
VOUT
VREF
IINR
IIN2
RFREQ1
IIN3
IIN4
RFREQ2
RWB
GND
WEN4
WEN3
P-P
ENABLE
RAMP1
RAMP2
OSCEN
WEN2
PDIN
IOUT
GND
GND
VCC
VCC
VCC
(max) oscillator is switched on and off by the OSCEN
24
23
22
21
20
19
18
17
16
15
14
13
RWB
GND
IIN2
IIN3
IIN4
RF1
RF2
1
2
3
4
5
6
7
24-Pin LPP Top View
Thermal Pad
19
18
17
16
15
14
13
VCC
IOUT
GND
GND
RAMP1
RAMP2
ENABLE
