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| (R) EL6224 Data Sheet June 16, 2004 FN7229 3-Channel Laser Diode Driver w/ Oscillator The EL6224 is a high performance three-channel laser driver that provides controlled current to a grounded laser diode. 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. An on-chip 600MHz 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 datasheet for further explanation). Output current pulses are enabled when an `L' signal is applied to the OUTEN pin. 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 shutoff is also achieved by holding the ENABLE pin low, which will override all other control pins. The external resistors allow the user to accurately and independently set each amplifier transconductance by applying a voltage to each 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. Features * "Shrink-Small" outline package * Voltage-controlled output current source requiring one external set resistor per channel * Current-controlled output current source * CH2 to 300mA max * CH3 to 150mA max * 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 600MHz * Oscillator to 100mAPK/PK * Single +5V supply (10%) * Disable feature for power-up protection and power savings Applications * CD-RW applications * Writable optical drives * Laser diode current switching Ordering Information PART NUMBER EL6224CU EL6224CU-T7 EL6224CU-T13 PACKAGE 16-Pin QSOP 16-Pin QSOP 16-Pin QSOP TAPE & REEL 7" 13" PKG. DWG. # MDP0040 MDP0040 MDP0040 Get FULL DATASHEET 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2002-2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. EL6224 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 2 |
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