400 hot springs road, carson city nv 89706 ? (775) 883-0820 ? fax (775) 883-0827 ? www.hytek.com ? 19 HY6110 laser diode driver tec controllers laser diode drivers micro-heaters high speed laser diode driver the HY6110 laser diode driver is a high speed, high current solid-state hybrid laser diode driver. it incorpo- rates a patented technique of ?backmatching? which allows remote drive of the laser diode through a 50 ? coaxial trans- mission line. this technique allows physical and thermal isolation of the laser diode and the 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 HY6110 is used in applications that require digital, high speed current modulation of the laser diode. the HY6110 input is ecl compatible and is terminated into 50 ? . the HY6110 uses a gaasfet current switch that drives a laser diode with modulation currents of up to 200ma 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 200ma. these selected currents modulate the laser beam at the input fre- quency. the HY6110 comes in a hermetic metal package. features ? single ended ecl input (50 ? ) ? data rates to 622 mbps ? adjustable modulation current ? patented ?backmatching? thermal management ? backmatched output allows remote drive through 50 ? line ? 200ma drive current figure 1 figure 2
20 ? 400 hot springs road, carson city nv 89706 ? (775) 883-0820 ? fax (775) 883-0827 ? www.hytek.com HY6110 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 con- trolled by the ecl rf input. when the rf input is open or set to an ecl ?low? input, only bias i cur- rent 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: sma connector for single-ended ecl input. the input is terminated with an equivalent 50 ? into ?2v re- quired by the ecl logic family. this input accepts data rates up to 622mbps. > rf out: sma connector for 50 ? transmission line connected to laser. 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 @ 220ma max. rf in ecl logic levels, 0?622mbps bias i 0 to 40ma for input voltage ?v to ?v + 2v mod i 0 to 200ma for input voltage ?v to ?v + 0.5v 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 HY6110 ?5.2v input (?5.2v) pin 1 ground (gnd) pin 2 ?v input (?v) pin 3 reference voltage output (ref out) pin 4 bias i adjust (bias i ) pin 5 modulation i adjust (mod i ) pin 6 ecl input waveform (rf in) sma 1 laser diode current driver (rf out) sma 2 model no. HY6110 description: 200ma high speed laser diode driver; metal hermetic package application: ecl digital modulation of laser diode ordering information
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