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EL6258C - Product Brief
EL6258C - Product Brief
3-Channel Laser Driver + Oscillator + APC Amplifier
Features
* High-performance laser diode driver * Voltage-controlled output current source requiring one external set resistor per channel * Current-controlled output current source * Rise time = 1.0ns * Fall time = 1.1ns * 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%) * Current amplification = 100 * Disable feature for power-up protection and power savings * TTL/CMOS control signals * Fast settling APC amplifier
General Description
The EL6258C is a high-performance three channel laser diode current amplifier that provides controlled current to a grounded laser diode. Channels 2 and 3 must 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. Each level of output current is set by an analog voltage applied to an external resistor which converts the voltage into a current at the IIN pins (virtually ground). The current seen at these pins is then amplified by 100X (150X on CH3) to become a current source at pin IOUT. An on-chip 500MHz oscillator is provided to allow current modulation when in the read mode. This is turned on when the OSCEN pin is held high (floating not recommended). Complete control of amplitude and frequency is set by two external resistors connected to ground at pins RFREQ and RAMP (see graphs for further explanation). The oscillator will also turn off whenever either of the OUTEN pins for channels 2 or 3 (the write channels) are low (see truth table). Output current pulses are enabled when an `L' signal is applied to the OUTEN pins. No output current flows when OUTEN is `H' and additional laser diode protection is provided since the OUTEN input will float high when open. Complete IOUT shut-off is also achieved by holding the ENABLE pin low, which will override the OUTEN control pins. The EL6258C also includes a fast settling APC amplifier designed to interface directly with the power monitor photodiode and the sampleand-hold amplifier, for read and write power control.
Applications
* * * * DVD drives CD-RW applications Writable optical drives Laser diode current switching
Ordering Information
Part No EL6258CU Temp. Range 0C to +70C Package QSOP-24 Outline # MDP0040
Connection Diagram
GND 1 IINR 2 IIN2 3 GND 4
24 GND 23 VCC 22 VCC 21 IOUT 20 IOUT 19 GND
RFREQ 5 IIN3 6 OUTENR 7 OUTEN2 8 OUTEN3 9 GND 10 VREF 11 VOUT 12
December 5, 2000
18 RAMP 17 ENABLE 16 OSCEN 15 VCC 14 GND 13 PDIN
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.
(c) 2001 Elantec Semiconductor, Inc.
EL6258C - Product Brief
EL6258C - Product Brief
3-Channel Laser Driver + 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.
WARNING - Life Support Policy
December 5, 2000
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
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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.
Printed in U.S.A.

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