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EL6935
Data Sheet February 18, 2004 FN7409
Laser Diode Driver w/ Waveform Generator
The EL6935 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 part also has an IV amplifier with concurrent read and write sampling. The gains of the IV amplifier are programmable, eliminating the need for external potentiometers. 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 EL6935 operates on a 5V supply for the analog circuits and a 2.5V supply for the digital circuits.
Features
* Complete programmable laser diode driver * 450mA 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 * 60psec 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 * Dual sampled IV amplifier with programmable sample select and gain select * Programmable HFM offset when HFM is off
Ordering Information
PART NUMBER EL6935CL EL6935CL-T7 EL6935CL-T13 PACKAGE 38-Pin LPP 38-Pin LPP 38-Pin LPP TAPE & REEL 7" 13" PKG. DWG. # MDP0046 MDP0046 MDP0046
Applications
* Combination DVD writable and CD writable drives * DVD camcorders * DVD video recorders
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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. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL6935
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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.
For information regarding Intersil Corporation and its products, see www.intersil.com 2

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