Laser Diode Driver with Waveform Generator Features General Description • Complete programmable laser diode driver • 250mA maximum output • 8bit x 8bit multiplying DAC output provides 8bit full scale adjustment and 8bit resolution at any full scale output • 0.17 nsec timer resolution • Two laser outputs allows read/write DVD and CD combinations • Programmable waveform values support 2.6GB DVD-RAM, 4.7GB DVD-RAM, DVD-R, DVD+RW, DVD-RW, CD-RW, and CD-R • Analog input supports APC • HFM oscillator programmable to 100mAP-P from 200MHz to 600MHz • PLL allows reduced-frequency clock on flex cable • Separate serial input works up to 25Mb/sec The EL6291C 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. This programmable architecture allows reprogramming of the timers to support different media, 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 EL6291C requires 3.3V and 5V supplies, with all the logical interface operating on the 3.3V supply. The EL6291C is available in 32-pin LPP and 32-pin QFN packages for improved thermal performance and reduced footprint. Ordering Information Part No Temp. Range Package Outline # 0°C to +70°C 32-Pin QFN MDP0045 EL6291CL 0°C to +70°C 32-Pin LPP MDP0046 26 MON 27 VSL 28 BUSY 29 SEN CLK 1 25 VSO NRZ 2 24 OUT1 VSL 3 23 OUT1 GND 4 22 GND GND 5 EL6291CY 30 SDIO 31 SCLK 32 R/W Connection Diagram Applications • Combination DVD writable and CD writable drives • DVD camcorders • DVD video recorders 21 VSO Thermal Pad 20 VSO VSL 7 19 OUT2 VSA 8 18 OUT2 L/G 16 ENA 15 GND 14 GND 13 NC 12 IAPC 11 RSET 10 17 VSO 32-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. October 12, 2001 NC 6 RFREQ 9 © 2001 Elantec Semiconductor, Inc. EL6291C - Product Brief EL6291C - Product Brief EL6291C - Product Brief EL6291C - Product Brief Laser Diode Driver with Waveform Generator General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. October 12, 2001 WARNING - Life Support Policy Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820 2 Printed in U.S.A.