Dual Laser Driver with APC Amp Features General Description • Read + 2 write channel laser driver with oscillator and fast I/V amplifier plus a separate ROM laser driver with oscillator • 200V/µs I/V amplifier • 100X gain, 100mA low noise read channel • 250X gain, 250mA and 150X gain, 150mA write channels • 500MHz, 100mAP-P oscillator • Write rise/fall times = 0.8ns • Single +5V supply The EL6240C is a combination read + 2 write level laser driver and IV amplifier, with an extra read + oscillator ROM channel for use in duallaser ‘combo’ applications. A separate (amplitude and frequency) oscillator modulates the selected output for laser noise reduction during read or write. Applications Combo CD-RW + DVD-ROM CD-RW to 16X CD-R to 32X Writable optical disk drives Ordering Information The CD pin, when high, selects the CD (write) laser. Positive current supplied to the IIN lines, through a user selected external resistor, allow the full scale range of each amplifier to be matched to the full scale range of the users control DACs. When the write laser is selected, and the WEN pins are switched low, the respective current is summed to the output with 1ns rise and fall times. When the CD pin is low, the ROM laserdiode is driven by output IOUT2, and no current will appear at output IOUT1. The 100mAP-P (max) oscillator is switched on and off by the OSCEN line. The CD line allows the oscillator to operate at different amplitudes and frequencies for each laser. The entire chip is powered down when ENABLE is low. The user can define the gain of the I/V amplifier. With a slew rate of 200V/µs, the I/V amplifier can normally settle to 1% within 30ns. Connection Diagrams MDP0046 PDIN 24 2 VREF VDD 23 3 IINR VDD 22 4 IIN2 IOUT1 21 5 RF1 GND 20 6 IIN3 GND 19 7 GND RAMP1 18 8 RF2 RAMP2 17 9 WEN2 ENABLE 16 IIN2 1 19 VCC RF1 2 18 IOUT1 IIN3 3 17 GND GND 4 11 WEN3 12 NC OSCEN 15 IOUT2 14 16 GND RF2 5 15 RAMP1 WEN2 6 14 RAMP2 CD 7 13 ENABLE WEN3 8 10 CD Thermal Pad VDD 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. October 25, 2001 1 VOUT 20 VCC MDP0040 24-Pin LPP OSCEN 12 24-Pin QSOP -40°C to +85°C 21 PDIN -40°C to +85°C EL6240CL IOUT2 11 EL6240CU 22 VOUT Outline # VCC 10 Package 23 VREF Temp. Range NC 9 Part No 24 IINR • • • • EL6240C - Product Brief EL6240C - Product Brief EL6240C - Product Brief EL6240C - Product Brief Dual Laser Driver with APC Amp 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 25, 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.