ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818, A5690, A5232, A4905 & MIL-STD-1553 Features CIRCUIT TECHNOLOGY • ACT4418 Dual Transceivers meets MIL-STD-1553A&B, Macair A3818, A4905, A5232 and A5690 Specs www.aeroflex.com/act1.htm General Description • ±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 One Channel TX DATA OUT TX DATA IN DRIVER OUTPUT STAGE SHAPING TX DATA IN TX DATA OUT V+ TX INHIBIT AMP CONTROL COMP. +5V RX DATA OUT V- -12V 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. GROUND RX DATA IN RX DATA IN INPUT AMP ACTIVE FILTER COMP. +12V STROBE Block Diagram (without Transformer) 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 eroflex Circuit Technology – Data Bus Modules For The Future © 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). 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 A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended 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 -40°C to +85°C -65°C to +150 °C Storage case temperature Power supply Voltages ±12 V P.S. to ±15V MAX +5 V P.S. to +7V MAX -0.3 V to +5.5 V Logic input Voltage ±40 V Receiver differential input Receiver input voltage (common mode) ±10V Transmitter peak output current 110 mA 1.65 mW Total package power dissipation over the full operating case temperature range (100% duty cycle) TJ Maximum 150°C Maximum junction to air temperature rise (100 % duty cycle) Maximum Junction-Air thermal resistance for free air 60°C 36°C/W Electrical Characteristics, Transmitter Section Input Characteristics, TX DATA in or TX DATA in Parameter Condition Symbol "0" Input Current VIN = 0.4 V "1" Input Current VIN = 2.7 V Typ Max Unit IILD -0.2 -0.4 mA IIHD 1.0 40 µA 0.7 V "0" Input Voltage VIHD "1" Input Voltage VIHD Min V 2.0 Inhibit Characteristics "0" Input Current VIN = 0.4V "1" Input Current VIN = 2.7V IILI IIHI "0" Input Voltage VILI "1" Input Voltage VIHI Delay from TX inhibit(0→1) to inhibited output Delay from TX inhibit, (1→0) to active output -0.4 mA 1.0 40 µA 0.7 V V 2 Note 1 tDXOFF 400 500 nS Note 1 tDXON 400 500 nS VNOI 0.8 10 mV p-p Differential output noise, inhibit mode Differential output impedance (inhibited) -0.2 Note 2 ZOI Ω 2K Output Characteristics Differential output level at point B–B’ Fig 5, Vcont = 10 Vdc, See Fig 3 for control voltage versus output level RL = 140 Ω Rise and fall times (10% to 90% of p-p output) Output offset at point A-A’on Fig 5, 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message tr RL = 35 Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal. (note 1.) Aeroflex Circuit Technology VO 30 36 200 250 300 VOS tDTX 3 28 ±90 330 450 V p-p nS mV peak nS SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Electrical Characteristics, Receiver Section Parameter Condition Symbol Note 1 Note 1 VIDR VICR CMRR Differential Input Voltage Range Input Common Mode Voltage Range Common Mode Rejection Ratio Note 3 Min Typ Max Unit 40 V p-p V p-p 10 40 dB Strobe Characteristics (Logic "O" inhibits output) "0" Input Current VS=0.4 V IIL -0.2 "1" Input Current VS=2.7V IIH -1.0 "0" Input Voltage VIL "1" Input Voltage VIH Strobe Delay (turn-on or turn-off) Note 1. -0.4 mA +40 µA 0.7 V V 2.0 tSD 150 nS 1.05 V P-P Threshold Characteristics (Sinewave input ) Internal Threshold Voltage (referred to the bus) 100KHz1 MHz VTH 0.60 0.8 VOH 2.5 3.6 Output Characteristics, RX DATA and RX DATA "1" State IOH = -0.4 mA "0" State Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points V IOL = 4 mA VOL 0.35 0.5 V Note 1 tDRX 300 450 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 Note 1 50% duty cycle 100% duty cycle Note 1 +V -V 30mA 50mA 50mA 70mA 75mA 95mA 120mA 140mA 5V 25mA Note: Typical currents for VO AT 140Ω = 30VP-P Recommended Power Supply Voltage Range Aeroflex Circuit Technology +V +11.4 Volts to +12.6 Volts -V -11.4 Volts to -12.6 Volts Logic +4.5 Volts to + 5.5 Volts 4 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Figure 3 Transmitter (TX) Output Amplitude vs Control Voltage Figure 4 Transmitter (TX) Output offset VP-P @ B–B' 30 LAST BIT OUTPUT AMPLITUDE 27 Magnified View 24 21 18 OUTPUT OFFSET * OUTPUT OFFSET * 0 Volts Typical 15 12 9 2.5 µsec Slope = 3VP-P/Vdc 6 3 *Offset measured at point A-A’ in Fig 5 0 0 1 2 3 4 5 6 7 8 9 10 Vdc CONTROL VOLTAGE Figure 5 Typical Transformer Connection (Total hybrid with one channel transmitting and the other not powered – 100% Duty Cycle) 70Ω 70Ω 52.5Ω C1 N1:N2 B A N1:N3 for stub coupling Ctr tap C2 POWER DISSIPATION WATTS TX DATA OUT Figure 6 Typical Hybrid Power Dissipation vs Duty Cycle (Total with one channel transmitting and the other not powered) B’ A’ TX DATA OUT 3.5 3.25 Total Hybrid Input Power 3.0 2.5 2.0 1.65 1.5 1.0 52.5Ω Typical Hybrid Dissipation 0.5 RX DATA IN RX DATA IN 4.0 C1 & C2 are > 0.47µF, BX Ceramic Capacitors. 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE, PERCENT Transformer turns ratios: N1:N2 = 1:1 N1:N3 = 1:0.707 Use Aeroflex 25T1553-1 For VOP-P = 30 V at 140Ω 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 3KΩ minimum at 1 MHz. 3. Specifications apply over the temperature range of -40°C to +85°C (Case Temperature) unless otherwise noted. 4. All typical values are measured at +25°C. Aeroflex Circuit Technology 5 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 Figure 6 – Lead Numbers & Functions ACT4418D Pin # Aeroflex Circuit Technology 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 VEE B 12 VCC 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 VEE A 24 VCC A 6 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Package Outline 24 13 .560 REF 1 12 1.366 MAX .170 .160 .244 .100 .008 1.195 1.205 .600 Ordering Information Model No. ACT4418D Receiver Data level Case Specs. Normally Low 24 Pin Plug In 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