circuit technology www.aeroflex.com/act1.htm eroflex circuit t echnology ? data bus modules for the future ? scd4418d rev a 9/24/97 features ? act4418 dual transceivers meets mil-std-1553a&b, macair a3818, a4905, a5232 and a5690 specs ? 12 volt power supply operation ? voltage source output for higher bus drive power ? molded plug-in package ? monolithic construction using linear asics ? variable tx amplitude ? processed and screened to mil-std-883 specs for industrial temperature range general description the aeroflex circuit technology act4418d is a new generation monolithic transceivers which provide full compliance with macair and mil- std-1553 data bus requirements while providing variable amplitude control. the act4418d performs the front- end analog function of inputting and outputting data through a transformer to a mil-std-1553 or macair data bus. the act4418d can be consid- ered a "universal" transceiver in that it is compatible with mil-std-1553a, b, macair a-3818, a-4905, a-5232 and a-5690. design of these transceivers reflects particular attention to active filter performance.this results in low bit and word error rate with superior waveform purity and minimal zero crossover distortion. the act4418d active filter design has additional high frequency roll-off to provide the required macair low harmonic distortion waveform without increasing the pulse delay characteristics significantly. efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high and well as low duty cycles. variable amplitude is adjusted with 0?10 vdc on the control pin. transmitter: the transmitter section accepts bi- phase ttl data at the input and when coupled to the data bus with a 1:1 transformer, isolated on the data bus side with two 52.5 ohm fault iso- lation resistors, and loaded by two 70 block diagram (without transformer) shaping output stage comp. comp. active filter input amp driver tx data in tx data in tx inhibit +5v rx data in rx data in strobe tx data out tx data out rx data out rx data out -12v +12v v+ v- amp control one channel ground act4418 molded dual variable amplitude transceivers & mil-std-1553 for macair a3818, a5690, a5232, a4905
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 2 ohm terminations plus additional receivers, the data bus signal pro- duced is 7.5 volts typical p -p at a- a?. (see figure 5.) when both data and data inputs are held low or high, the transmitter output becomes a high impedance and is ?removed? from the line. in addition, an overriding ?inhibit" input pro- vides for the removal of the trans- mitter output from the line. a logic ?1? applied to the ?inhibit? takes priority over the condition of the data inputs and disables the transmitter. (see transmitter logic wave- forms,figure 1.) the transmitter utilizes an active filter to suppress harmonics above 1 mhz to meet macair specifications a-3818, a-4905, a-5232 and a- 5690. the transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit. receiver: the receiver section accepts bi- phase differential data at the input and produces two ttl signals at the output. the outputs are data and data , and represent positive and negative excursions of the input beyond a pre-determined threshold. (see receiver logic waveforms, figure 2.) the internal threshold is nominally set to detect data bus signals exceeding 1.05 volts p-p and reject signals less than 0.6 volts p-p when used with a 1:1 turns ratio trans- former (see figure 5 for transformer data and typical connection). a low level at the strobe input inhibits the data and data out- puts. if unused, a 2k pull-up to +5 volts is recommended data in data in inhibit line to line output notes: 2. data and data inputs must be complementary waveforms or 50% duty cycle average, with no delays between them. 3. data and data must be in the same state during off time (both high or low). figure 1 transmitter logic waveforms figure 2 receiver logic waveforms note overlap note : waveforms shown are for normally low devices. for normally high receiver output devices, the receiver outputs are swapped as shown by the dashed lines level line to line input data out data out 1. line to line waveforms illustrate macair signals, mil-std-1553 signals are trapezoidal
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 3 absolute maximum ratings operating case temperature -40c to +85c storage case temperature -65c to +150 c power supply voltages 12 v p.s. to 15v max +5 v p.s. to +7v max logic input voltage -0.3 v to +5.5 v receiver differential input 40 v receiver input voltage (common mode) 10v transmitter peak output current 110 ma total package power dissipation over the full operating case temperature range (100% duty cycle) 1.65 mw t j maximum 150c maximum junction to air temperature rise (100 % duty cycle) 60c maximum junction-air thermal resistance for free air 36c/w electrical characteristics, transmitter section input characteristics, tx data in or tx data in parameter condition symbol min typ max unit "0" input current v in = 0.4 v i ild -0.2 -0.4 ma "1" input current v in = 2.7 v i ihd 1.0 40 a "0" input voltage v ihd 0.7 v "1" input voltage v ihd 2.0 v inhibit characteristics "0" input current v in = 0.4v i ili -0.2 -0.4 ma "1" input current v in = 2.7v i ihi 1.0 40 a "0" input voltage v ili 0.7 v "1" input voltage v ihi 2 v delay from tx inhibit(0 ? 1) to inhibited output note 1 t dxoff 400 500 ns delay from tx inhibit, (1 ? 0) to active output note 1 t dxon 400 500 ns differential output noise, inhibit mode v noi 0.8 10 mv p-p differential output impedance (inhibited) note 2 z oi 2k w output characteristics differential output level at point b?b? fig 5, vcont = 10 vdc, see fig 3 for control volt- age versus output level r l = 140 w v o 28 30 36 v p-p rise and fall times (10% to 90% of p-p output) t r 200 250 300 ns output offset at point a-a?on fig 5, 2.5 s after midpoint crossing of the parity bit of the last word of a 660 s message r l = 35 w v os 90 mv peak delay from 50% point of tx data or tx data input to zero crossing of differential signal. (note 1.) t dtx 330 450 ns
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 4 electrical characteristics, receiver section parameter condition symbol min typ max unit differential input voltage range v idr 40 v p-p input common mode voltage range note 1 v icr 10 v p-p common mode rejection ratio note 3 note 1 cmrr 40 db strobe characteristics (logic "o" inhibits output) "0" input current v s =0.4 v i il -0.2 -0.4 ma "1" input current v s =2.7v i ih -1.0 +40 a "0" input voltage v il 0.7 v "1" input voltage v ih 2.0 v strobe delay (turn-on or turn-off) note 1. t sd 150 ns threshold characteristics (sinewave input ) internal threshold voltage (referred to the bus) 100khz- 1 mhz v th 0.60 0.8 1.05 v p-p output characteristics, rx data and rx data "1" state i oh = -0.4 ma v oh 2.5 3.6 v "0" state i ol = 4 ma v ol 0.35 0.5 v delay, (average)from differential input zero crossings to rx data and rx data output 50% points note 1 t drx 300 450 ns power data power supply currents (typical) ? per channel ? see figure 4 (power supplies set at +12v, -12v, +5v) duty cycle +v -v 5v transmitter standby 30ma 50ma 25ma 25% duty cycle note 1 50ma 70ma 50% duty cycle 75ma 95ma 100% duty cycle note 1 120ma 140ma note: typical currents for v o a t 140 w = 30v p - p recommended power supply voltage range +v +11.4 volts to +12.6 volts -v -11.4 volts to -1 2.6 volts logic +4.5 volts to + 5.5 volts
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 5 notes 1. characteristics guaranteed by design, not production tested. 2. power on or off, measured from 75khz to 1mhz at point a-a' and transformer self impedance of 3k w minimum at 1 mhz. 3. specifications apply over the temperature range of -40c to +85c (case temperature) unless otherwise noted. 4. all typical values are measured at +25c. figure 3 transmitter (tx) output amplitude figure 4 transmitter (tx) output offset figure 5 typical transformer connection figure 6 typical hybrid power dissipation 0 10 20 30 40 50 60 70 80 90 100 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 duty cycle, percent p o w e r d i s s i p a t i o n w a t t s output offset * output offset * last bit 2.5 sec *offset measured at point a-a? in fig 5 n1:n2 a a? b? b tx data out tx data out rx data in rx data in 70 w 70 w 52.5 w 52.5 w ctr tap transformer turns ratios: n1 : n2 = 1 : 1 n1 : n3 = 1 : 0.707 use aeroflex 25t1553-1 n1:n3 for stub coupling 0 volts magnified view vs control voltage 0 1 2 3 4 5 6 7 8 9 10 control voltage o u t p u t a m p l i t u d e 12 15 27 30 24 21 18 9 6 3 0 typical slope = 3v p - p /v dc v p - p @ b?b' vdc (total hybrid with one channel transmitting and the other not powered ? 100% duty cycle) total hybrid input power c2 c1 c1 & c2 are > 0.47f, bx ceramic capacitors. vs duty cycle (total with one channel transmitting and the other not powered) for v o p - p = 30 v at 140 w typical hybrid dissipation 3.25 1.65
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 6 figure 6 ? lead numbers & functions act4418d pin # function channel 1 tx inhibit a 2 tx data in a 3 tx data in a 4 strobe a 5 control voltage a 6 +5v 7 rx data out b 8 rx data out b 9 txrx data out b 10 txrx data out b 11 v e e b 12 v c c b 13 tx inhibit b 14 tx data in b 15 tx data in b 16 strobe b 17 control voltage b 18 ground 19 rx data out a 20 rx data out a 21 txrx data out a 22 txrx data out a 23 v e e a 24 v c c a
aeroflex circuit technology scd4418d rev a 9/24/97 plainview ny (516) 694-6700 7 ordering information model no. receiver data level case specs. act4418d normally low 24 pin plug in 1553 & macair specifications subject to change without notice. 1.366 max .560 ref .170 .244 1.195 1.205 .160 .100 .600 .008 package outline 1 12 24 13 the information contained in this data sheet is believed to be accurate; however, aeroflex circuit technology. assumes no responsibility for its use, and no license or rights are granted by implication or otherwise in connection the rewith. aeroflex circuit technology 35 south service road plainview new york 11803 telephone: (516) 694-6700 fax: (516) 694-6715 toll free inquiries: 1-(800)the-1553 circuit technology
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