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PDF EL6248CU Data sheet ( Hoja de datos )

Número de pieza EL6248CU
Descripción 3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
Fabricantes Elantec Semiconductor 
Logotipo Elantec Semiconductor Logotipo



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EL6248C - 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
• Current-controlled output current
source
• CH2 to 250mA max
• CH3 to 150mA max
• 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
• Auto-oscillator for read
• Single +5V supply (±10%)
• Disable feature for power-up
protection and power savings
• Fast Settling APC Amplifier
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
Ordering Information
Part No
EL6248CU
Temp. Range
0°C to +70°C
Package
24-Pin QSOP
Outline #
MDP0040
General Description
The EL6248C 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 IOUT 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 IIN pin
(virtually ground). The current seen at this pin is then amplified to
become a current source at pin IOUT.
An on-chip 500MHz oscillator is provided to allow output current
modulation when in any mode. This is turned on when the OSCEN
and OUTEN pins are 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).
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 IOUT shut-off is also achieved by
holding the ENABLE pin low, which will override all other control
pins.
The EL6248C 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
1 VOUT
PDIN 24
2 VREF
VCC 23
3 IINR
VCC 22
4 IIN2
IOUT 21
5 RFREQ
IOUT 20
6 IIN3
GND 19
7 OUTENR RAMP 18
8 OUTEN3 ENABLE 17
9 OUTEN2 OSCEN 16
10 GND
VCC 15
11 NC
GND 14
12 NC
NC 13
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.

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