3-Channel Laser Diode Driver w/Oscillator & APC Amplifier Features General Description • Shrink-Small Outline Package • Voltage-controlled output current source requiring one external set resistor per channel • Rise time = 0.8ns • Fall time = 0.8ns • On chip oscillator with frequency and amplitude control by use of external resistors to ground • Oscillator to 500MHz • Oscillator to 100mA pk/pk • Single +5V supply (±10%) • Disable feature for power-up protection and power savings • Fast Settling APC Amplifier The EL6242C is a high-performance three channel laser driver that provides controlled current to a grounded laser diode. Write channels 2 and 3 should be used as the write channels, with switching speeds of approximately one nanosecond rise/fall time. All three channels are summed together at the IOUT output, allowing the user to create multilevel waveforms in order to optimize laser diode performance. The level of the output current is set by an analog voltage applied to an external resistor which converts the voltage into a current at the IIN pin (virtually ground). The current seen at this pin is then amplified to become a current source at pin IOUT. Applications The EL6242C also includes a fast settling APC amplifier designed to interface directly with the front end monitor diode and the sampleand-hold amplifier for read and write power control. Its 100MHz bandwidth and 30ns settling time enable up to 16X CD-RW design. • CD-RW applications • Writable optical drives • Laser diode current switching An on-chip 500MHz oscillator is provided to allow output current modulation when in any mode. This is turned on when the OSCEN pin is held high. Complete control of amplitude and frequency is set by two external resistors connected to ground at pins RFREQ and RAMP (see graphs in this data sheet for further explanation). Connection Diagrams LPP-24 MDP0046 3 GND VCC 22 4 IINR IOUT 21 5 IIN2 IOUT 20 6 IIN3 GND 19 7 RFREQ GND 18 RFREQ 4 8 GND RAMP 17 GND 5 15 GND 9 GND ENABLE 16 GND 6 14 RAMP 10 WEN3 OSCEN 15 WEN3 7 11 WEN2 VCC 14 12 GND GND 13 IINR 1 19 VCC IIN2 2 18 IOUT IIN3 3 17 IOUT Thermal Pad 16 GND 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. © 2001 Elantec Semiconductor, Inc. February 13, 2001 24-Pin QSOP 20 VCC 0°C to +70°C VCC 23 OSCEN 12 EL6242CL 2 VREF 21 PDIN MDP0040 VCC 11 QSOP-24 22 VOUT 0°C to +70°C PDIN 24 GND 10 EL6242CU 1 VOUT 23 VREF Outline # GND 9 Package 24 GND Temp. Range WEN2 8 Ordering Information Part No. EL6242C - Product Brief EL6242C - Product Brief EL6242C - Product Brief EL6242C - Product Brief 3-Channel Laser Diode Driver w/Oscillator & APC Amplifier 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. February 13, 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.