EL6244CU Elantec Inc, EL6244CU Datasheet
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EL6244CU
Manufacturer Part Number
EL6244CU
Description
Manufacturer
Elantec Inc
Specifications of EL6244CU
Date_code
02
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Part Number:
EL6244CU
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Part Number:
EL6244CU-T13
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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
• Auto oscillator on-off with
• Rise time = 0.8ns
• Fall time = 0.8ns
• On chip oscillator with frequency
• Oscillator to 500MHz
• Oscillator to 100mA pk/pk
• Single +5V supply (±10%)
• Disable feature for power-up
• Fast Settling APC Amplifier
• CD-RW applications
• Writable optical drives
• Laser diode current switching
EL6244CU
source, requiring one external set
resistor per channel
OUTEN signals
and amplitude control by use of
external resistors to ground
protection and power savings
Part No.
Temp. Range
0°C to +70°C
16-Pin QSOP
Package
MDP0041
Outline #
EL6244C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
General Description
The EL6244C is a high-performance three channel laser driver that
provides controlled current to a grounded laser diode. Channels 2 and
3 should be used as the write channels, with switching speeds of
approximately one nanosecond rise/fall time. All three channels are
summed together at the I
level 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 I
(virtually ground). The current seen at this pin is then amplified 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 only when the
OSCEN and OUTEN pins are held high. Complete control of ampli-
tude 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 EL6244C 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. Its 100MHz
bandwidth and 30ns settling time enable up to 16X CD-RW design.
Connection Diagram
OUT
1
2
3
4
5
6
7
8
VOUT
VREF
IINR
IIN2
IIN3
RFREQ
OUTEN3
OUTEN2
output, allowing the user to create multi-
OUT
OUT
.
ENABLE
OSCEN
RAMP
PDIN
IOUT
GND
VCC
VCC
shut-off is also achieved by
16
15
14
13
12
11
10
9
IN
pin