EL6258CU Elantec Inc, EL6258CU Datasheet
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EL6258CU
Manufacturer Part Number
EL6258CU
Description
3-channel laser diode driver and oscillator + APC amplifier
Manufacturer
Elantec Inc
Datasheet
1.EL6258CU.pdf
(2 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
EL6258CU
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
• High-performance laser diode
• Voltage-controlled output current
• Current-controlled output current
• Rise time = 1.0ns
• Fall time = 1.1ns
• 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
• TTL/CMOS control signals
• Fast settling APC amplifier
• DVD drives
• CD-RW applications
• Writable optical drives
• Laser diode current switching
EL6258CU
Part No
driver
source requiring one external set
resistor per channel
source
and amplitude control by use of
external resistors to ground
protection and power savings
Temp. Range
0°C to +70°C
QSOP-24
Package
MDP0040
Outline #
EL6258C - Product Brief
3-Channel Laser Driver + Oscillator + APC Amplifier
General Description
The EL6258C is a high-performance three channel laser diode current
amplifier that provides controlled current to a grounded laser diode.
Channels 2 and 3 must be used as the write channels, with switching
speeds of approximately one nanosecond rise/fall time. All three chan-
nels are summed together at the I
create multilevel waveforms. Each level of output current is set by an
analog voltage applied to an external resistor which converts the volt-
age into a current at the I
these pins is then amplified by 100X (150X on CH3) to become a cur-
rent source at pin I
An on-chip 500MHz oscillator is provided to allow current modula-
tion when in the read mode. This is turned on when the OSCEN 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 for further explanation). The
oscillator will also turn off whenever either of the OUTEN pins for
channels 2 or 3 (the write channels) are low (see truth table).
Output current pulses are enabled when an ‘L’ signal is applied to the
OUTEN pins. 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 the OUTEN con-
trol pins.
The EL6258C also includes a fast settling APC amplifier designed to
interface directly with the power monitor photodiode and the sample-
and-hold amplifier, for read and write power control.
Connection Diagram
OUT
.
IN
OUTENR
OUTEN2
OUTEN3
pins (virtually ground). The current seen at
RFREQ
VOUT
VREF
GND
GND
GND
IINR
IIN2
IIN3
10
11
12
1
2
3
4
5
6
7
8
9
OUT
OUT
output, allowing the user to
shut-off is also achieved by
24
23
22
21
20
19
18
17
16
15
14
13
GND
VCC
VCC
IOUT
IOUT
GND
RAMP
ENABLE
OSCEN
VCC
GND
PDIN
Related parts for EL6258CU
EL6258CU Summary of contents
Page 1
... Part No Temp. Range Package Outline # EL6258CU 0°C to +70°C QSOP-24 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
EL6258C - Product Brief 3-Channel Laser Driver + 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- ...