400 hot springs road, carson city nv 89706 ? (775) 883-0820 ? fax (775) 883-0827 ? www.hytek.com ? 25 high speed laser diode driver driver. the laser diode can be driven through a transmission line without the need for a matched impedance termination. this removes a large source of heat that can be detrimental to high performance laser diode systems. the HY6510 is used in applications that require digi- tal, high speed current modulation of the laser diode. the HY6510 input is ecl compatible and is terminated into 50 ? . the HY6510 uses a gaasfet current switch that drives a laser diode with modulation currents of up to 400ma peak-to-peak. two programmable current sources allow user selectability of the bias and modulation currents. the pre-bias current is selectable from zero to 40ma. the modulation current is selectable from zero to 400ma. these selected currents modulate the laser beam at the input fre- quency. the HY6510 comes in a 32 pin dual in-line ceramic package. this package provides a cost effective alternative to the hermetic package of the hy6410 driver. an aluminum heat spreader is included as part of the package for heat sinking the device. HY6510 laser diode driver features: ? single ended ecl input (50 ? ) ? data rates up to 622mbps ? programmable bias current ? adjustable modulation current ? patented ?backmatching? thermal manage- ment ? backmatched output allows remote drive through 50 ? line ? thru-hole or surface-mount packaging tec controllers laser diode drivers micro-heaters figure 1 figure 2
26 ? 400 hot springs road, carson city nv 89706 ? (775) 883-0820 ? fax (775) 883-0827 ? www.hytek.com HY6510 laser diode driver pin descriptions > ?5.2v input: power supply input for ecl buffer circuitry. > ground: ground return for ?5.2v ecl supply and ?v. > ?v: power supply input for bias and modulation currents as well as laser diode drive circuitry. > ref out: precision reference output, +5v with respect to ?v (if ?v is ?12v, ref out would be ?7v). > bias i : input used to set the bias current for the laser diode. maximum bias current occurs when the voltage at the bias i input is +2v with respect to the ?v input. the voltage at the bias i input for a given bias cur- rent is determined by the equation: v(bias i ) = ?v + (desired bias current) x 40 ? ? ? ? ? > mod i : input used to set the modulation current for the laser diode. this current is added to the bias i current which always flows through the laser diode. maximum modulation current occurs when the voltage at the mod i input is +0.5v with respect to the ?v input. the current set by the mod i voltage is controlled by the ecl rf input. when the rf input is open or set to an ecl ?low? input, only bias i current flows through the laser diode. the voltage at the mod i input for a given modulation current is determined by the equation: v(mod i ) = ?v + (desired modulation current) x 2.5 ? ? ? ? ? > rf in: the input is terminated with an equivalent 50 ? into ?2v required by the ecl logic family. this input ac- cepts data rates up to 622mbps. > rf out: the patented ?backmatching? technique does not require a 50 ? termination at the laser diode end of the transmission line. input specifications power inputs ?5.2v supply ?4.9v to ?5.5v @ 115ma max. ?12v supply (?v) ?9v to ?12v @ 420ma max. rf in ecl logic levels, 0?600mbps bias i 0 to 40ma for input voltage ?v to ?v + 2v mod i 0 to 400ma for input voltage ?v to ?v + 1.0v output specifications rf out current output into 50 ? transmission line low current = bias i , high current = mod i rf out transmission line length 10 feet max. ref out ?v +5v environmental conditions operating temperature ?55c to 100c (case) storage temperature ?65 to 150c pin designations description HY6510 ?5.2v input (?5.2v) pin 14 ground (gnd) pins 13, 19, 31 ?v input (?v) pin 12 reference voltage output (ref out) pin 10 bias i adjust (bias i ) pin 9 modulation i adjust (mod i ) pin 8 ecl input waveform (rf in) pin 18 laser diode current driver (rf out) pin 32 model no. HY6510 description: 400ma high speed laser diode driver; ceramic package application: ecl digital modulation of laser diode ordering information
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