ELANT EL6259CU Datasheet
EL6259C - Product Brief
Low Noise 4-Channel Laser Diode Driver + Oscillator
EL6259C - Product Brief
Features
• Low output noise = 4. 0n A /r t- H z
• High-performance laser diode
driver
• Pin compatible with EL6257
• 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 res istors to ground
• Oscillator to 500 MH z
• Oscillator to 100 mA pk / pk
• Single +5V supply (±10%)
• Disable feature for power-up
protection and power savings
• TTL/CMOS control signals
Applications
• DVD-RAM high speed drives
• CD-RW applications
• Writable optical drives
• Laser diode current switching
General Description
The EL6259C is a l ow n oise f our c han nel l aser diod e cu rre nt am plifie r
that provides control led curre nt to a gr ounded 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 channels, with
switching speeds of appro ximately on e nanoseco nd rise/fal l time. All
four channels are summed together at the I
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. The curren t se en at t his pi n is the n am pli fie d by
100X to become a current source at pin I
An on-chip 500 MHz oscillator is provided to allow current modulation when in the read mode. This is turned on when the EOSC 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).
Output current pulses ar e enabl ed whe n an ‘L’ signal is applied to the
pin. No output cur ren t flo ws whe n OE is ‘H’, and additional laser
OE
diode protection is provided since the OE
open. Complete I
low, which will override the OE
shut-off is also achieved by holding the CE pin
OUT
control 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 I
from a current DAC or other current source.
output, allo wing th e
OUT
.
OUT
input will float high when
pin can be biased
IN
Ordering Information
Part No Temp. Range Package Outline #
EL6259CU 0°C to +70°C QSOP-24 MDP0040
Complete Product Specifications
Elantec Technical Support:
North America: 1-888- 352-6832 X 311
Asia: +85-45-682-5820
Europe: +44-18-977-6020
©2000 Elantec Semiconductor, I nc.
Connection Diagram
GND
I
GND
I
RFREQ
I
I
OER
OE2
OE3
OE4
GND
INR
1
2
3
4
IN2
5
6
IN3
7
IN4
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND
V
CC
V
CC
I
OUT
I
OUT
GND
RAMP
CE
EOSC
V
CC
V
CC
GND
January 31, 2000
EL6259C - Product Brief
Low Noise 4-Channel Laser Diode Driver + Oscillator
EL6259C - Product
General Disclaimer
Specifications contained in this product brief are in effect as of the publication date shown. Elantec Semiconductor, Inc. reserves the right to make
changes in the circuitry or specifications contained herein at any time without notice. Elantec Semiconductor, 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 Semiconductor, Inc. products are not authorized for and
should not be used within Life Support Systems without the specific
written consent of Elantec Semiconductor, Inc. Life Support sys-
Elantec Semiconductor, Inc.
675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: (408) 945-1323
(888) 352-6832 (toll free)
Fax: (408) 945-9305
European Office: 44-18-977-6020
Japan Office: 85-45-682-5820
tems are equipment intended to support or sustain life and whose
failure to perform when prop erly used in accordance wi th instructions provided can be reasonably expected to result in significant
personal injury or death. Users contemplating application of Elantec
Semiconductor, Inc. Products in Life Support Systems are requested
to contact Elantec Semiconductor, Inc. factory headquarters to
establish suitable terms & conditions for these applications. Elantec
Semiconducto r, Inc. ’s warranty is limited to replacem ent of defective components and does not cover injury to persons or property or
other consequential damages.
January 31, 2000
2
Printed in U.S.A.
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