1 fn7212 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 ame ricas inc. copyright ? intersil americas inc. 2003-2004. all rights reserv ed. elantec is a registered tra demark of elantec semiconductor, inc. all other trademarks mentioned are the property of their respec tive owners. EL6146 4-channel laser diode driver + oscillator the EL6146 is a fou r channel laser diode current amplifier that provides controlled current to a grounded laser diode. channels 2, 3 , and 4 must be us ed as the write channels, with switching sp eeds of approximately one nanosecond rise/fall time. all four channels are summed together at the i out output, allowing th e 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 i in pin (virtually ground). the current seen at this pin is then amplified to become a current source at pin i out . an on-chip 500mhz oscillator i s provided to allow current modulation when in any mode. this is turned on when the oscen pin is held high. compl ete control of amplitude and frequency is set by two extern al resistors connected to ground at pins r freq and r amp (see graphs in this data sheet 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 inpu t will float high when open. complete i out shutoff is also achie ved by holding the enable pin low, which will ov erride all other control pins. the external resistors allow the user to accurately and independently set each amplif ier transconductance by applying a voltage to each resistor, without restriction on the voltage range, thus ensuring broad voltage dac compatibility. alternatively, the i in pin can be biased from a current dac or othe r current source. features ? shrink-small outline package ? voltage-controlled output c urrent source requiring one external set resistor per channel ? current-controlled output current source ? 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 powe r-up protection and power savings ? cmos control signals applications ? cd-rw applications ? writable optical drives ? laser diode current switching ordering information part number package tape & reel pkg. dwg. # EL6146cu-t7 16-pin qsop 7 mdp0040 data sheet june 15, 2004 to request the full datasheet, please visit www.intersil.com/products/EL6146
2 all intersil u.s. products are m anufactured, assembled and test ed utilizing iso9001 quality systems. intersil corporations quality ce rtifications can be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d 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 paten ts 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 subsidiari es. for information regarding intersil corporation and its products , see www.intersil.com submit document feedback EL6146
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