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| ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818, A5690, A5232, A4905 & MIL-STD-1553 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 www.aeroflex.com/act1.htm CIRCUIT TECHNOLOGY General Description The Aeroflex Circuit Technology ACT4418D is a new generation monolithic transceivers which provide full compliance with Macair and MILSTD-1553 data bus requirements while providing variable amplitude control. The ACT4418D performs the frontend analog function of inputting and outputting data through a transformer to a MIL-STD-1553 or Macair data bus. The ACT4418D can be considered 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. One Channel TX DATA OUT TX DATA IN TX DATA IN V+ TX INHIBIT AMP CONTROL RX DATA OUT DRIVER SHAPING OUTPUT STAGE TX DATA OUT COMP. +5V -12V GROUND RX DATA IN RX DATA IN +12V STROBE INPUT AMP V- ACTIVE FILTER COMP. RX DATA OUT Transmitter: The Transmitter section accepts biphase 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 isolation resistors, and loaded by two 70 Block Diagram (without Transformer) eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4418D REV A 9/24/97 Ohm terminations plus additional receivers, the data bus signal produced is 7.5 volts typical P -P at AA'. (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 provides for the removal of the transmitter 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 Waveforms,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 A5690. The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit. 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 transformer (See Figure 5 for transformer data and typical connection). A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended Receiver: The Receiver section accepts biphase 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 Figure 1 Transmitter Logic Waveforms DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT NOTES: 1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal 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 2 Receiver Logic Waveforms LINE TO LINE INPUT DATA OUT DATA OUT Note overlap NOTE: Waveforms shown are for normally low devices. For normally high receiver output level devices, the receiver outputs are swapped as shown by the dashed lines Aeroflex Circuit Technology 2 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating case temperature Storage case temperature Power supply Voltages Logic input Voltage Receiver differential input Receiver input voltage (common mode) Transmitter peak output current Total package power dissipation over the full operating case temperature range (100% duty cycle) TJ Maximum Maximum junction to air temperature rise (100 % duty cycle) Maximum Junction-Air thermal resistance for free air -40C to +85C -65C to +150 C 12 V P.S. to 15V MAX +5 V P.S. to +7V MAX -0.3 V to +5.5 V 40 V 10V 110 mA 1.65 mW 150C 60C 36C/W Electrical Characteristics, Transmitter Section Input Characteristics, TX DATA in or TX DATA in Parameter "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Condition VIN = 0.4 V VIN = 2.7 V Symbol IILD IIHD VIHD VIHD IILI IIHI VILI VIHI Min Typ -0.2 1.0 Max -0.4 40 0.7 Unit mA A V V 2.0 -0.2 1.0 Inhibit Characteristics "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Delay from TX inhibit(01) to inhibited output Delay from TX inhibit, (10) to active output Differential output noise, inhibit mode Differential output impedance (inhibited) Note 2 Note 1 Note 1 VIN = 0.4V VIN = 2.7V -0.4 40 0.7 2 400 400 0.8 2K 500 500 10 mA A V V nS nS mV p-p tDXOFF tDXON VNOI ZOI Output Characteristics Differential output level at point B-B' Fig 5, Vcont = 10 Vdc, See Fig 3 for control voltage versus output level Rise and fall times (10% to 90% of p-p output) 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 Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal. (note 1.) Aeroflex Circuit Technology RL = 140 VO 28 30 36 V p-p tr 200 250 300 nS RL = 35 VOS 90 mV peak tDTX 3 330 450 nS SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Electrical Characteristics, Receiver Section Parameter Differential Input Voltage Range Input Common Mode Voltage Range Common Mode Rejection Ratio Note 3 Note 1 Note 1 Condition Symbol VIDR VICR CMRR Min 10 40 Typ Max 40 Unit V p-p V p-p dB Strobe Characteristics (Logic "O" inhibits output) "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Strobe Delay (turn-on or turn-off) Note 1. VS=0.4 V VS=2.7V IIL IIH VIL VIH tSD 2.0 150 -0.2 -1.0 -0.4 +40 0.7 mA A V V nS Threshold Characteristics (Sinewave input ) Internal Threshold Voltage (referred to the bus) 100KHz1 MHz VTH 0.60 0.8 1.05 V P-P Output Characteristics, RX DATA and RX DATA "1" State "0" State Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points IOH = -0.4 mA IOL = 4 mA Note 1 VOH VOL tDRX 2.5 3.6 0.35 300 0.5 450 V V nS Power Data Power Supply Currents (Typical) - Per Channel - See Figure 4 (Power supplies set at +12V, -12V, +5V) Duty Cycle Transmitter Standby 25% duty cycle 50% duty cycle 100% duty cycle Note 1 Note: Typical currents for VO AT 140 = 30VP-P Note 1 +V 30mA 50mA 75mA 120mA -V 50mA 70mA 95mA 140mA 5V 25mA Recommended Power Supply Voltage Range +V -V Logic +11.4 Volts to +12.6 Volts -11.4 Volts to -12.6 Volts +4.5 Volts to + 5.5 Volts Aeroflex Circuit Technology 4 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Figure 3 Transmitter (TX) Output Amplitude vs Control Voltage VP-P @ B-B' 30 27 OUTPUT AMPLITUDE 24 21 18 15 12 9 6 3 0 0 1 2 3 4 5 6 7 8 9 10 CONTROL VOLTAGE Slope = 3VP-P/Vdc Typical 0 Volts Figure 4 Transmitter (TX) Output offset LAST BIT Magnified View OUTPUT OFFSET* OUTPUT OFFSET* 2.5 sec *Offset measured at point A-A' in Fig 5 Vdc Figure 5 Typical Transformer Connection (Total hybrid with one channel transmitting and the other not powered - 100% Duty Cycle) 70 70 Figure 6 Typical Hybrid Power Dissipation vs Duty Cycle (Total with one channel transmitting and the other not powered) POWER DISSIPATION WATTS 4.0 3.5 3.0 2.5 2.0 1.5 1.0 Typical Hybrid Dissipation 10 20 30 40 50 60 70 80 90 100 1.65 Total Hybrid Input Power 3.25 TX DATA OUT C1 N1:N2 B 52.5 A Ctr tap N1:N3 for stub coupling A' 52.5 C2 TX DATA OUT RX DATA IN RX DATA IN B' 0.5 0 0 C1 & C2 are > 0.47F, BX Ceramic Capacitors. Transformer turns ratios: N1:N2 = 1:1 N1:N3 = 1:0.707 Use Aeroflex 25T1553-1 DUTY CYCLE, PERCENT For VOP-P = 30 V at 140 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 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. Aeroflex Circuit Technology 5 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Figure 6 - Lead Numbers & Functions ACT4418D Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Function Tx INHIBIT Tx DATA IN Tx DATA IN STROBE CONTROL VOLTAGE +5v Rx DATA OUT Rx DATA OUT TxRx DATA OUT TxRx DATA OUT VEE VCC Tx INHIBIT Tx DATA IN Tx DATA IN STROBE CONTROL VOLTAGE GROUND Rx DATA OUT Rx DATA OUT TxRx DATA OUT TxRx DATA OUT VEE VCC A A A A A A B B B B B B B B B B B Channel A A A A A Aeroflex Circuit Technology 6 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Package Outline 24 13 .560 REF 1 1.366 MAX 12 .170 .160 .244 .008 .100 .600 1.195 1.205 Ordering Information Model No. ACT4418D Receiver Data level Normally Low Case 24 Pin Plug In Specs. 1553 & Macair 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 therewith. Specifications subject to change without notice. Aeroflex Circuit Technology 35 South Service Road Plainview New York 11803 Aeroflex Circuit Technology Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800)THE-1553 7 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 |
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