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| ACT4468D Dual Transceivers for MIL-STD-1553 Features * World's smallest and lowest standby power dual transceiver 0.3" x 1" packages * Dual transceiver meets military data bus requirements, MIL-STD-1553 and MIL-STD-1760 * Low power dissipation at full output power * Single +5V power supply * Current source output * Monolithic construction using dielectrically isolated(D.I.) * Processed and screened to MIL-STD-883 specs * DESC SMD# 5962-92061 Pending CIRCUIT TECHNOLOGY www.aeroflex.com General Description The Aeroflex Circuit Technology Model ACT4468D is a next generation D.I. monolithic transceiver which provide full compliance with MIL-STD-1553/1760 and data bus requirements in the smallest packages with the lowest standby power consumption and one power supply operation. The dual channel Model ACT4468D perform the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553/1760 data bus. 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. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. ACT4468D Dual Transceiver Each channel of the dual transceiver is completely separate from the other and fully independent. This includes power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction. TX/RX TX/RX TX DATA IN TX DATA IN DRIVER SHAPING OUTPUT STAGE Transmitter: The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm terminations plus additional receivers, the data bus signal produced is 7.5Volts nominal P-P at A-A'. (See Figure 5.) When both DATA and DATA inputs are held low or high, the transmitter output becomes TX INHIBIT RX DATA OUT +5 V REFERENCE COMP. GROUND INPUT AMP ACTIVE FILTER COMP. RX DATA OUT STROBE Block Diagram (without Transformer), 1/2 of unit shown eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4468D REV B 5/25/00 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 Waveform, Figure 1.) The transceiver utilizes an active filter to suppress harmonics above 1MHz. The Transmitter may be safely operated at 100% duty cycle for an indefinite period into a short circuited 1553 bus. 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 Waveform. Figure 2.) The pre-set internal thresholds will detect data bus signals exceeding 1.150 Volts P-P and reject signals less than 0.6 volts P-P when used with a 1:2.5 turns ratio transformer. (See Figure 5 for transformer data and typical connection.) CIRCUIT TECHNOLOGY Figure 1. Transmitter Logic Waveforms DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT NOTES: 1.DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them. 2.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 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating Case Temperature Storage Case Temperature Positive Power Supply Voltage Receiver Differential Input Receiver Input Voltage (Common Mode) Driver Peak Output Current Total Package Power Dissipation over the Full Operating Case Temperature Rise Maximum Junction To Case Temperature Rise for the Hottest Device Thermal Resistance, Junction to Bottom of Case -55C to +125C -65C to +150C -0.3 V to +7.0 V 10 V 5 V 650 mA 2 Watt (Note: Normal operation conditions require one transmitter on and the other off at any given time. 10C 5C/W Electrical Characteristics - Driver Section Input Characteristics, TX DATA in or TX DATA in Parameter Condition "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage VIN = 0.4 V VIN = 2.7 V Symbol IILD IIHD VIHD VIHD Min Typ -0.2 1 Max -0.4 40 0.7 Unit mA A V V 2.0 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 1 VIN=0.4V VIN=2.7V IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI 2K 2 200 80 2 300 150 10 -0.2 1.0 -0.4 40 0.7 mA A V V nS nS mV p-p Output Characteristics Differential 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 RL=35 RL=35 VO tr VOS 6.5 100 7.5 170 8.0 300 V p-p nS 90 mV peak tDTX 100 150 nS Note 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5 Aeroflex Circuit Technology 3 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Electrical Characteristics - Receiver Section Parameter Differential Voltage Range, Figure 4 Point P-P' Common Mode Rejection Ratio Condition Symbol VIDR CMRR Min Typ Max 20 Unit V peak dB 45 Strobe Characteristics (Logic "0" inhibits output) if not used, a 1K pullup to 5 V is recommended "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Strobe Delay (turn-on) Strobe Delay (turn-off) VS=0.4 V VS=2.7V IIL IIH VIL VIH tSD(ON) tSD(OFF) 2.0 40 60 100 100 -0.2 1 -0.4 +40 0.7 mA A V V nS nS Threshold Characteristics (Sinewave input ) Input Threshold Voltage(referred to the bus) 100KHz1MHz VTH 0.60 0.8 1.15 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 VOH VOL tDRX 2.5 3.7 0.3 250 0.5 400 V V nS Power Data Maximum Currents, Per Channel (+5V) Duty Cycle Transmitter Standby 25% duty cycle 50% duty cycle 100% duty cycle Typ 20 mA 155 mA 290 mA 560 mA Max 30 mA 185 mA 335 mA 650 mA Power Supply Voltage +V Note 2. Vcc= 5 volts 0.1 V, for all measurements unless otherwise specified. Note 3. Specifications apply over the case temperature range of -55C to +125C unless otherwise specfied. Note 4. All typical values are measured at +25C 4 4.75 to 5.5 Volts Aeroflex Circuit Technology SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Figure 3 - Transmitter (TX) Output Waveform Figure 4 - Transmitter (TX) Output Offset LAST BIT tf* 90% Magnified View OUTPUT OFFSET* 6V P-P MIN 7.7V P-P MAX 0 Volts 0 volts OUTPUT OFFSET* 10% 2.5 sec tr* * Rise and fall times measured at point A-A' in Fig 5 *Offset measured at point A-A' in Fig 5 Figure 5 - Typical Transformer Connection 70 70 ZO Figure 6 - Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered) 1600 POWER DISSIPATION MILLIWATTS 1400 1200 1000 800 Typical 600 400 200 Maximum TX DATA OUT D.U.T 1:2.5 P B 52.5 A Center Tap 1:1.77 for stub coupling TX DATA OUT RX DATA IN RX DATA IN P' B' 52.5 A' 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE - PERCENT Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P Configurations and Ordering Information Model No. ACT4468D ACT4468DF ACT4468DI ACT4468DFI DESC No. 5962-92061(Pending) 5962-92061(Pending) 5962-92061(Pending) 5962-92061(Pending) Receiver Data level Normally Low Normally Low Normally High Normally High Case DIP Package Flat Package DIP Package Flat Package Configuration Dual Dual Dual Dual Aeroflex Circuit Technology 5 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 C I R C U I T T E C H N O L O G YCIRCUIT TECHNOLOGY Package Outline Drawings "FLAT Package" .990 1.010 .890 .910 Pin #'s & Functions .008 .012 1 2 3 +5Vdc A TX/RX A TX/RX A STROBE A GROUND A +5Vdc B TX/RX B TX/RX B STROBE B GROUND B RX DATA OUT B RX DATA OUT B TX INHIBIT B TX DATA IN B TX DATA IN B RX DATA OUT A RX DATA OUT A TX INHIBIT A TX DATA IN A TX DATA IN A ESD Triangle Identifies Pin 1 20 11 .290 .310 10 4 5 6 7 .400 8 .016 .020 .050 .075 9 10 11 .098 .122 "DIP Package" .990 1.010 20 .287 .303 10 ESD Triangle Identifies Pin 1 12 11 .300 13 14 15 16 .025 .045 .150 .MIN .008 .012 17 18 19 20 .098 .122 .100 BSC .05 .016 .020 .890 .910 Notes 1. Dimensions shown are in inches 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 6 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 |
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