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EL6938
Data Sheet June 24, 2004 FN7410
Laser Diode Driver with Waveform Generator
The EL6938 is a highly integrated laser diode driver designed to support multi-standard writable optical drives. It accomplishes this by incorporating a waveform generator wherein the diode currents and timing details can be programmed before operation. The data input circuitry inspects the NRZ serial data waveform and generates programmed waveforms in recognition of 3, 4, 5, or 6 or more clock periods of space changing to 3, 4, 5, or 6 or more clock periods of mark, and vice versa. The architecture allows reprogramming of the timers to support different media, Blue, DVD, or CD standards, and different speeds. The programming is accomplished through a serial interface port. Two outputs are provided to support dual-laser multi-standard optical heads. The clock and NRZ inputs can be either standard CMOS or LVDS, selectable through a program bit. The EL6938 requires 2.5V and 5V supplies, with all the logical interface operating on the 2.5V supply.
Features
* Complete programmable laser diode driver * 500mA maximum total output * 10-bit x 10-bit multiplying DAC output provides 10-bit full scale adjustment and 10-bit resolution at any full scale output * 54 psec timer resolution * Two laser outputs allows read/write DVD and CD combinations * Programmable waveform values support CD-R, CD-RW, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW, and Blue * Two analog inputs support slope and read APC * HFM oscillator programmable to 100mAP-P from 100MHz to 500MHz * PLL allows reduced-frequency clock on flex cable * Separate serial input works up to 100MHz * Programmable HFM offset when HFM is off * Pb-free available
Applications
* Combination DVD writable and CD writable drives * DVD camcorders * DVD video recorders
Ordering Information
Get FULL DATASHEET
PART NUMBER EL6938CL EL6938CL-T7 EL6938CL-T13 EL6938CLZ (See Note) EL6938CLZ-T7 (See Note)
PACKAGE 32-Pin QFN (5x6mm) 32-Pin QFN (5x6mm) 32-Pin QFN (5x6mm) 32-Pin QFN (5x6mm) (Pb-Free) 32-Pin QFN (5x6mm) (Pb-Free)
TAPE & REEL 7" 13" 7" 13"
PKG. DWG. # MDP0046 MDP0046 MDP0046 MDP0046 MDP0046 MDP0046
EL6938CLZ-T13 32-Pin QFN (5x6mm) (See Note) (Pb-Free)
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. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL6938
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
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.
For information regarding Intersil Corporation and its products, see www.intersil.com 2

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