1-Ch Laser Diode Driver + Oscillator Features General Description • Voltage-controlled output current source (requiring one external set resistor) • Current-controlled output current source. • Rise time = 3.0 ns typ. • Fall time = 3.5 ns typ. • On-chip oscillator w/frequency and amplitude control by use of external resistors to ground. • Oscillator to 500 MHz typ. • Oscillator to 100 mA pk/pk typ. • Single +5V supply (±10%) • Current amplification = 100 • TTL/CMOS control signals The EL6272C is a single channel laser diode current amplifier that provides controlled current to a grounded laser diode. The amplifier can provide up to 200 mA of DC or pulsed current with switching speeds of approximately three nanoseconds rise/fall time. 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 by 100X to become a current source at pin IOUT. Applications • • • • MO drives Mini-Disc drives Writable optical drives Laser diode current switching Ordering Information An on-chip 500 MHz oscillator is provided to allow current modulation when in read 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). Output write current pulses are enabled when an ‘L’ signal is applied to the OUTEN pin. The external resistor allows the user to accurately and independently set the amplifier transconductance by applying a voltage to the set resistor, without restriction on the voltage range, thus ensuring broad voltage DAC compatibility. Alternatively, the IIN pin can be biased from a current DAC or other current source. Connection Diagram Part No Temp. Range Package Outline # EL6272CY 0°C to +70°C MSOP10 MDP0043 North America: 1-888-352-6832 X 311 Asia: +85-45-682-5820 Europe: +44-18-977-6020 ENABLE 1 10 VCC IIN 2 9 IOUT RFREQ 3 8 GND OUTEN 4 7 RAMP OSCEN 5 6 VCC January 31, 2000 Complete Product Specifications Elantec Technical Support: ©2000 Elantec Semiconductor, Inc. EL6272C - Product Brief EL6272C - Product Brief EL6272C - Product EL6272C - Product Brief 1-Ch Laser Diode Driver + Oscillator General Disclaimer Specifications contained in this product brief are in effect as of the publication date shown. Elantec Semiconductor, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec Semiconductor, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. January 31, 2000 WARNING - Life Support Policy Elantec Semiconductor, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec Semiconductor, 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 Semiconductor, Inc. Products in Life Support Systems are requested to contact Elantec Semiconductor, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec Semiconductor, 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) 352-6832 (toll free) Fax: (408) 945-9305 European Office: 44-18-977-6020 Japan Office: 85-45-682-5820 2 Printed in U.S.A.