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EL6244
Data Sheet June 17, 2004 FN7245
3-Channel Laser Diode Driver w/Oscillator & APC Amplifier
The EL6244 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 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 (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 only 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 additional 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 EL6244 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.
Features
* "Shrink-Small" Outline Package * Voltage-controlled output current source, requiring one external set resistor per channel * Auto oscillator on-off with OUTEN signals * 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 100mAPK/PK * Single +5V supply (10%) * Disable feature for power-up protection and power savings * Fast Settling APC Amplifier * Pb-free Available as an Option
Applications
* CD-RW applications * Writable optical drives * Laser diode current switching
Ordering Information
PART NUMBER EL6244CU EL6244CU-T7 EL6244CU-T13 EL6244CUZ (See Note) EL6244CUZT7 (See Note) EL6244CUZT13 (See Note) PACKAGE 16-Pin QSOP 16-Pin QSOP 16-Pin QSOP 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) 16-Pin QSOP (Pb-free) TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0040 MDP0040 MDP0040 MDP0040 MDP0040 MDP0040
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NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2001-2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL6244
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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