general description the gd19903 is a high-speed amplifier, which provides a high power output drive suitable to feed an optical modulator at 10 gbit/s. gd19903 provides single-ended or differ - ential output drive to an external modula - tor. the outputs must be externally ac coupled, and on-chip termination is pro - vided to minimize reflections. the output amplitude can be adjusted to the required value by sourcing a dc cur - rent into a control terminal of the device. the data outputs can be shut down by setting the amplitude control currents to 0. when shut down, the residual output data amplitude will be less than 1.5 % of maximum amplitude. the gd19903 modulator driver provides amplitude modulation (am) control of the outputs of the modulator driver for control of the modulation in mach-zehnder modulators. the am will be controlled by inserting a dither current at up to 10 khz with am amplitude of up to 10 % of the data amplitude. an analogue monitor output is provided to indicate peak-peak output voltage swing. the gd19903 modulator driver is deli- vered in a 68 pin ceramic package with 50 transmissions lines. an intel company data sheet rev.: 06 advance information features fully differential, 10 v pp differential drive capability. cml inputs. limiting structure. output peak-peak monitor. data outputs can be turned off. capability to am modulate output. power supply: -8.0 v and +5 v no external choke required. maximum rise/fall time of 45 ps (20 ? 80 %). power dissipation: 8.6 w (typical) at maximum output swing. package: 68 pin mlc applications telecommunications transmission systems: ? sdh stm-64 ? sonet oc-192 wdm applications. 10 gbit/s optical transmission. 10 gbit/s modulator driver gd19903 vmonref vmon vout vin vinn voutn vee vcc iset1 iset2
functional details general the gd19903 modulator driver incorpo - rates a limiting amplifier and provides a high power output. the device performs the following functions: 1. high output drive capability, sufficient to drive optical iii-v modulator or an linbo 3 at 9.952 gbit/s data rate. 2. on chip termination (50 to ground) on the differential cml inputs. outputs must be externally ac cou - pled and on-chip termination is pro - vided to minimize reflections. 3. the output amplitude can be adjusted between maximum and minimum values over a wide temperature and operating range. the amplitude can be controlled by a dc current. 4. shutdown of output data takes place when the amplitude control current and am control current are set to 0. the residual output data amplitude rms is within 1.5% of full amplitude. figure 1. application diagram functionality the gd19903 can be driven with a single ended or a differential input. the unused input does not need to be terminated, but a50 resistor ac coupled to gnd is recommended. the inputs can be dc coupled, but then the applied circuit must not alter the quiescent input voltage. the dc level at the output vary with the out - put voltage swing and therefore ac cou - pling is recommended. when used to drive a single ended load, the unused output shall be 50 terminated via an ac coupling capacitor. (see figure 1 ) the amplifier output voltage swing is controlled through the current flowing into the pins iset1 and iset2. it is recom - mended that the two pins are tied to - gether giving a common impedance of typical 45 . figure 3 shows a typical measurement of vout vs. iset = iset1 + iset2. the slope is 0.12 v/ma. if the two iset pins are both left open and the vset pin is connected to gnd maximum output voltage swing is achieved. this setting is only recom - mended for test purposes and vset in - put shall normally be left open with a capacitor to gnd. shutting the outputs off can be obtained by tying both iset1 and iset2 to vee. figure 2. vout vs. iset (typical). figure 3. vmon - vmonref vs. vout (typical). the voltage difference between vmon and vmonref is a measure of the driver output level with a slope of 37 mv/v. please observe that this relation is only valid with input signals levels within the specified range. figure 2 shows a typical measurement of vmon ? vmonref vs. vout special precautions when the gd19903 is used to drive a single-ended load, the unused output shall be terminated (ac coupled) to 50 . inputs vin/vinn are open circuit and short circuit (to ground) protected. outputs vout/voutn are open circuit protected only. ac short circuit is allowed. note: dc short circuit to ground will cause permanent damage to the device. data sheet rev.: 06 gd19903 page 2 of 7 vcc +5v 50 50 50 vout gd19903 modulator gd16555a mux/pll vin vinn voutn iset1 iset2 feb i am i amp feb = ferrite bead vmonref vmon vee -8.0v 0 0,05 0,1 0,15 0,2 0,25 0123456 vout [vpp] vmon - vmonref [v] 0 1 2 3 4 5 6 0 5 10 15 20 25 30 35 40 iset [ma] vout [v]
pin list mnemonic: pin no.: pin type: description: vin, vinn 27, 25 cml data input, differential 10 gbit/s, dc-coupled. vout, voutn 61, 59 ac data output, differential 10 gbit/s, dc-coupled. vmonref 40 dc modulation current monitor reference. vmon 42 dc modulation current monitor. iset1, iset2 41, 13 dc current input for output agc and am control. gnd 1, 4, 9, 14, 17, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 31, 32, 33, 38, 43, 48, 51, 53, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65,66, 67, 68 pwr ground, 0v. vee 18, 35 pwr -8.0 v negative supply voltage. vcc 34, 52 pwr +5 v positive supply voltage. nc 2, 3, 5, 6, 7, 8, 10, 11, 12, 15, 16, 36, 37, 39,44, 45, 46, 47, 49, 50 not connected package pinout figure 4. package 68 pin cml, top view data sheet rev.: 06 gd19903 page 3 of 7 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 gnd iset2 nc gnd gnd gnd nc nc nc nc nc nc nc nc nc nc gnd gnd gnd gnd gnd gnd gnd gnd vout gnd voutn gnd gnd gnd gnd gnd gnd vcc gnd nc nc gnd nc nc nc nc gnd vmon iset1 vmonre f nc gnd nc nc vee vcc gnd gnd gnd gnd gnd gnd vin gnd vinn gnd gnd gnd gnd vee gnd gnd
maximum ratings these are the limits beyond which the component may be damaged. all voltages in the table are referred to gnd. all currents in the table are defined positive out of the pin. symbol: characteristic: conditions: min.: typ.: max.: unit: v cc positive supply gnd 5.5 v v ee negative supply -8.5 gnd v v i vin,vinn cml input voltage -3.5 0.5 v v vset vset voltage level v ee gnd v v iset voltage @ iset pin note 1 v ee v ee +4 v i iset amplitude control current level 0 -45 ma t 0 operating temperature, t case note 2 0 70 c t s storage temperature -65 125 c note 1: i set pins are intended for current drive only. voltage forcing into i set pins that exceeds maximum ratings will cause permanent damage to the device. iset = iset1 + iset2 note 2: hot-spot temperature 150 c@70 ct case . dc characteristics t case =0 cto70 c, vcc = +5.0 v 5 %, vee = -8.0 v 5%. all voltages in the table are referenced to gnd. all input signal and power currents in the table are defined positive into the pin. all output signal currents are defined positive out of the pin. symbol: characteristic: conditions: min.: typ. : max.: unit: v cc positive supply 4.75 5 5.25 v v ee negative supply -8.4 -8.0 -7.6 v i cc positive supply current 240 ma i ee negative supply current -1020 ma p diss power dissipation 8.6 9.7 w data sheet rev.: 06 gd19903 page 4 of 7
ac characteristics t case =0 cto70 c, vcc = +5.0 v 5 %, vee = -8.0 v 5%. symbol: characteristic: conditions: min.: typ.: max.: unit: v vout,voutn output data amplitude per output 5.0 v pp v vin,vinn input data amplitude per input 300 400 500 mv pp t rise /t fall in input data rise/fall time, 20 ? 80 % 40 ps t rise /t fall out output data rise/fall time, differential 20 ? 80 % t rise /t fall in 45 ps s11 0-6ghz 6-10ghz note 1 -7 -5 db db s22 0-6ghz 6-10ghz note 1 -7 -5 db db note 1: measured on gd19903-68ba (gullwings) on fr4 pcb, gd99903. data sheet rev.: 06 gd19903 page 5 of 7
package outline figure 5. package 68 pin mlc straight leads (68ab). all dimensions are in inch. figure 6. package 68 pin mlc gullwings leads (68ba). all dimensions are in inch. data sheet rev.: 06 gd19903 page 6 of 7 pin 1 0.750" +- 0.007" sq 0.950" +- 0.02" sq 17 18 34 35 51 52 68 0.010" 0.040" 0.056" +- 0.006" 0.086" +- 0.01"
device marking figure 7. device marking. top view. ordering information to order, please specify as below: product name: intel order number: package type: case temperature range: gd19903-is qgd19903is mm#: 836666 68 pin straight leads , multi layer ceramic 0..70 c gd19903-ig QGD19903IG mm#: 836667 68 pin gullwings leads, multi layer ceramic 0..70 c gd19903, data sheet rev.: 06 - date: 24 july 2001 the information herein is assumed to be reliable. giga assumes no responsibility for the use of this information, and all such information shall be at the users own risk. prices and specifications are subject to change without notice. no patent rights or licenses to any of the circuits described herein are implied or granted to any third party. giga does not authorise or warrant any giga product for use in life support devices and/or systems. mileparken 22, dk-2740 skovlunde denmark phone : +45 7010 1062 fax : +45 7010 1063 e-mail : sales@giga.dk web site : http://www.intel.com/ixa please check our internet web site for latest version of this data sheet. distributor: copyright ? 2001 giga aps an intel company all rights reserved an intel company gd19903 wwyy - i
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