EL6242C - Product Brief
EL6242C - Product Brief
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
Features
• Shrink-Small Outline Package
• Voltage-controlled output current
source requiring one external set
resistor per channel
• Rise time = 0.8ns
• Fall time = 0.8ns
• On chip oscillator with frequency
and amplitude control by use of
external resistors to ground
• Oscillator to 500MHz
• Oscillator to 100mA pk/pk
• Single +5V supply (±10%)
• Disable feature for power-up
protection and power savings
• Fast Settling APC Amplifier
General Description
The EL6242C is a high-performance three channel laser driver that
provides controlled current to a grounded laser diode. Write 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
OUT
output, allowing the user to create multi-
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
IN
pin
(virtually ground). The current seen at this pin is then amplified to
become a current source at pin I
OUT
.
An on-chip 500MHz oscillator is provided to allow output current
modulation when in any mode. This is turned on when the OSCEN pin
is held high. 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).
The EL6242C 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.
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Connection Diagrams
1 VOUT
Outline #
Ordering Information
Part No.
EL6242CU
EL6242CL
Temp. Range
0°C to +70°C
0°C to +70°C
Package
QSOP-24
LPP-24
MDP0040
MDP0046
PDIN 24
21 PDIN
24 GND
20 VCC
19 VCC
18 IOUT
17 IOUT
Thermal Pad
16 GND
15 GND
14 RAMP
13 ENABLE
GND 10
VCC 11
OSCEN 12
WEN2 8
GND 9
VCC 23
VCC 22
IOUT 21
IOUT 20
GND 19
GND 18
RAMP 17
ENABLE 16
OSCEN 15
VCC 14
GND 13
IINR 1
IIN2 2
IIN3 3
RFREQ 4
GND 5
GND 6
WEN3 7
22 VOUT
23 VREF
2 VREF
3 GND
4 IINR
5 IIN2
6 IIN3
7 RFREQ
8 GND
9 GND
10 WEN3
11 WEN2
12 GND
February 13, 2001
24-Pin QSOP
24-Pin LPP Top View
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.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
