ACT4419 Single Supply Variable Amplitude Transceivers for MIL-STD-1553 Preliminary Features • First fully monolithic 5V only Variable Amplitude Transceiver • Lowest standby power • 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 • Radiation Hard to 2.5 MRADS Total Dose • DESC SMD pending • Either 5V or 10V DC control line (Factory Set) CIRCUIT TECHNOLOGY www.aeroflex.com General Description The Aeroflex Circuit Technology model ACT4419 is a next generation D.I. monolithic transceiver which provides variable amplitude in full compliance with MIL-STD-1553/1760 data bus requirements with the lowest standby power consumption available and one power supply operation. The model ACT4419 performs 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. ACT4419FP & ACT4419 Plug In Transceivers Variable amplitude is adjusted with factory preset 0 - 10 Vdc or 0 - 5 Vdc control line at 1mA maximum input current. Transmitter TX/RX TX DATA IN DRIVER SHAPING OUTPUT STAGE REFERENCE COMP. ACTIVE FILTER COMP. TX DATA IN TX/RX TX INHIBIT +5 V RX DATA OUT GROUND INPUT AMP STROBE Block Diagram RX DATA OUT The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a primary grounded center tap 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 a high impedance and is “removed” from the line. In addition, an eroflex Circuit Technology – Data Bus Modules For The Future © SCD4419 REV B 10/21/99 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). CIRCUIT TECHNOLOGY 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). 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 SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Positive Power Supply Voltage +5.0 V to +7.0 V Receiver Differential Input ±10 V Receiver Input Voltage (Common Mode) ±5 V Driver Peak Output Current 650 mA Total Package Power Dissipation over the Full Operating Case Temperature Rise 2 Watt Maximum Junction To Case Temperature Rise for the Hottest Device 10°C Thermal Resistance, Junction to Bottom of Case 5°C/W Electrical Characteristics – Driver Section Input Characteristics, TX DATA in or TX DATA in Parameter Condition Symbol Min Typ Max Unit "0" Input Current VIN = 0.4 V IILD -0.2 -0.4 mA "1" Input Current VIN = 2.7 V IIHD 1 40 µA 0.7 V "0" Input Voltage VIHD "1" Input Voltage VIHD 2.0 V Inhibit Characteristics "0" Input Current VIN=0.4V "1" Input Current VIN=2.7V IILI -0.2 -0.4 IIHI 1.0 40 "0" Input Voltage VILI "1" Input Voltage VIHI 0.7 µA V V 2 Delay from TX inhibit,(0→1) to inhibited output tDXOFF 200 300 Delay from TX inhibit, (1→0) to active output tDXON 80 150 Differential Output Noise, inhibit mode VNOI 2 10 Differential Output Impedance (inhibited) mA nS nS mVp-p Ω Note 1 ZOI 2K Pt. A - A’ VO 6 7.5 8 V p-p tr 100 170 300 nS 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 µS after midpoint crossing of the parity bit of the last word of a 660 µS message RL=35 Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal Control Voltage Slope 0 – 5 Vdc measured at Pt A - A’ 0 – 10 Vdc measured at Pt A - A’ Aeroflex Circuit Technology VOS ±90 tDTX IL = 1 mA max 3 1.1 0.55 mV peak 100 150 nS 1.5 0.75 1.9 0.95 Vp-p/Vdc Vp-p/Vdc SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700 Electrical Characteristics – Receiver Section Parameter Condition Differential Voltage Range, Figure 4 Point P-P’ Symbol Min Typ VIDR Common Mode Rejection Ratio CMRR Max Unit 20 V peak 45 dB Strobe Characteristics (Logic "0" inhibits output) if not used, a 1K pullup to 5 V is recommended "0" Input Current VS=0.4 V IIL -0.2 -0.4 mA "1" Input Current VS=2.7V IIH 1 +40 µA 0.7 V "0" Input Voltage VIL "1" Input Voltage VIH V 2.0 Strobe Delay (turn-on) tSD(ON) 40 100 nS Strobe Delay (turn-off) tSD(OFF) 60 100 nS 1.15 Vp-p Threshold Characteristics (Sinewave input ) 100KHz1MHz Input Threshold Voltage(referred to the bus) VTH 0.60 0.8 2.5 3.7 Output Characteristics, RX DATA and RX DATA "1" State IOH=-0.4 mA VOH "0" State IOL = 4 mA VOL 0.3 0.5 V tDRX 250 400 nS Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points V Power Data Maximum Currents, Per Channel (+5V) Duty Cycle Typ Max Transmitter Standby 20 mA 30 mA 25% duty cycle 155 mA 185 mA 50% duty cycle 290 mA 335 mA 100% duty cycle 560 mA 650 mA Power Supply Voltage +V 4.75 to 5.5 Volts Notes: 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5 2. Vcc= 5 volts ±0.1 V, for all measurements unless otherwise specified. 3. Specifications apply over the case temperature range of -55°C to +125°C unless otherwise specfied. 4. All typical values are measured at +25°C Aeroflex Circuit Technology 4 SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700 Figure 3 – Transmitter (TX) Output Amplitude vs Control Voltage Figure 4 – Transmitter (TX) Output Offset VP-P @ B–B' 7.5 6.75 OUTPUT AMPLITUDE 6 LAST BIT Slope = 0.75 VP-P/Vdc for 10V Slope = 1.5 VP-P/Vdc for 5V Magnified View 5.25 OUTPUT OFFSET* 4.5 0 volts Typical 3.75 7.5 3 6 2.25 4.5 1.5 3 .75 0 0 OUTPUT OFFSET* 2.5 µsec 1.5 1 2 3 4 5 6 7 8 9 *Offset measured at point A-A’ in Fig 5 Vdc 10 CONTROL VOLTAGE Figure 6 – Power Dissipation vs. Duty Cycle Figure 5 – Typical Transformer Connection 70Ω 70Ω ZO 55Ω 1:2.5 P B D.U.T TX DATA OUT A Center Tap P’ 1:1.77 for stub coupling A’ B’ 55Ω RX DATA IN POWER DISSIPATION MILLIWATTS TX DATA OUT 1600 1400 1200 Maximum 1000 800 Typical 600 400 200 RX DATA IN 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE – PERCENT Transformer Use Technitrol 1553-45 or Equivalent Aeroflex Circuit Technology 5 Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY PLUG-IN PACKAGE 1.27 MAX 1.10 24 13 1.27 MAX 1.10 1 12 0.175 MAX 0.24 MIN 0.018 DIA. ±0.002 FLAT PACKAGE Pin Connections 0.100 1. TX DATA OUT 2. TX DATA OUT 3. TX GND (+5) 4. N.C. 5. N.C. 6. N.C. 7. RX DATA OUT 8. STROBE 9. RX GND (+5V) 10.RXDATA OUT 11. N.C. 12. N.C. 13. N.C. 14. N.C. 15. RX DATA IN 16. RX DATA IN 17. GND 18. CASE GND 19. N.C. 20. +5V 21. TX INHIBIT 22. TX DATA IN 23. TX DATA IN 24. N.C. 1.27 MAX 0.017 ±0.002 1 Dot indicates Pin 1 1.27 MAX 0.10 Typ 0.400 MAX 2 sides 0.009 ±0.002 0.167 for Low Profile Flat Pack 0.200 for Std Flat Pack 0.080 ±0.015 Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.10.0±0.002 tolerance, non-cumulative, each row. Configurations and Ordering Information Model No. DESC No. Receiver Data level Case Specs. Configuration ACT4419 Pending Normally Low Plug In 1553 & 1760 Single ACT4419FP Pending Normally Low Flat Pack 1553 & 1760 Single 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 SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700