4-Channel Laser Driver with APC Amp Features General Description • Read + 3 Write Channel laser driver with oscillator & fast I/V amplifier • Rise time = 0.8 nsec • Fall time = 0.8 nsec • 200V/µs I/V amplifier • 100X gain, 100mA low noise read channel • 200X gain, 200mA write channel • Two 100X gain, 100mA write channels • 500MHz, 100mAP-P Oscillator with dual frequency and amplitude control • 3.3V compatible logic signals • Single +5V supply The EL6281C is a combination read + 3 write level laser driver with IV amplifier. A dual amplitude, dual frequency RF oscillator sums on the output for laser noise reduction during read or write. All these functions are provided in 24-lead QSOP and LPP packages. Applications • CD-RW to 16X • CD-R to 32X • Writable Optical Disk Drives The ENABLE pin enables the read & write channels. Positive current supplied to the IIN lines, through user selected resistors, allow the full scale range of each amplifier to be matched to the full scale range of the users control DACs. When the WEN pins are switched low, the respective current is summed to the output with 1ns rise and fall times. The 100mAP-P (max) oscillator is switched on and off by the OSCEN line. The R/W line allows the oscillator to operate at one amplitude and frequency when R/W is high, and another amplitude and frequency when R/W is low. The entire chip is powered down when ENABLE is low. The user can calibrate the gain of the I/V amplifier. With a slew rate around 200V/µs, the I/V amplifier can normally settle to less than 1% within 30ns. VCC 23 3 IINR VCC 22 4 IIN2 IOUT 21 5 RFREQ1 GND 20 6 IIN3 GND 19 7 IIN4 RAMP1 18 8 RFREQ2 RAMP2 17 9 RWB ENABLE 16 10 GND OSCEN 15 11 WEN4 VCC 14 12 WEN3 WEN2 13 IIN2 1 19 VCC RF1 2 18 IOUT IIN3 3 17 GND IIN4 4 Thermal Pad 16 GND RF2 5 15 RAMP1 RWB 6 14 RAMP2 GND 7 13 ENABLE 24-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 25, 2001 2 VREF 20 VCC MDP0046 OSCEN 12 MDP0040 LPP-24 21 PDIN QSOP-24 0°C to +70°C VCC 11 0°C to +70°C PDIN 24 22 VOUT EL6281CU EL6281CL 1 VOUT WEN2 10 Outline # 23 VREF Package WEN3 9 Temp. Range WEN4 8 Part No. 24 IINR Connection Diagram Ordering Information © 2001 Elantec Semiconductor, Inc. EL6281C - Product Brief EL6281C - Product Brief EL6281C - Product Brief EL6281C - Product Brief 4-Channel 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.