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ACT4419 Single Supply Variable Amplitude Transceivers for MIL-STD-1553
Features
Preliminary
CIRCUIT TECHNOLOGY
www.aeroflex.com
* 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)
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. Variable amplitude is adjusted with factory preset 0 - 10 Vdc or 0 - 5 Vdc control line at 1mA maximum input current.
ACT4419FP & ACT4419 Plug In Transceivers
Transmitter
TX/RX TX DATA IN TX DATA IN DRIVER SHAPING OUTPUT STAGE TX/RX
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a
TX INHIBIT RX DATA OUT
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
+5 V
REFERENCE
COMP.
GROUND
INPUT AMP
ACTIVE FILTER
COMP.
RX DATA OUT
STROBE
Block Diagram
eroflex Circuit Technology - Data Bus Modules For The Future (c) 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). 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.
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SCD4419 REV B 10/21/99 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 +5.0 V to +7.0 V 10 V 5 V 650 mA 2 Watt
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 mVp-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 Control Voltage Slope 0 - 5 Vdc measured at Pt A - A' 0 - 10 Vdc measured at Pt A - A'
Aeroflex Circuit Technology
Pt. A - A'
VO tr VOS
6 100
7.5 170
8 300
V p-p nS
RL=35
90
mV peak
tDTX
100
150
nS
IL = 1 mA max
3
1.1 0.55
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
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 Vp-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 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 -55C to +125C unless otherwise specfied. 4. All typical values are measured at +25C
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Figure 3 - Transmitter (TX) Output Amplitude vs Control Voltage
VP-P @ B-B' 7.5 6.75 6 OUTPUT AMPLITUDE 5.25 Slope = 0.75 VP-P/Vdc for 10V Slope = 1.5 VP-P/Vdc for 5V
Figure 4 - Transmitter (TX) Output Offset
LAST BIT
Magnified View
OUTPUT OFFSET*
4.5 Typical 3.75 3 2.25 1.5 .75 0 0 1 2 3 4 5 6 7 8 9 7.5 6 4.5 3 1.5 Vdc 10
0 volts
OUTPUT OFFSET*
2.5 sec
*Offset measured at point A-A' in Fig 5
CONTROL VOLTAGE
Figure 5 - Typical Transformer Connection
70 70 ZO
Figure 6 - Power Dissipation vs. Duty Cycle
1600 POWER DISSIPATION MILLIWATTS 1400 1200 1000 800 Typical 600 400 200 0 0 10 20 30 40 50 60 70 80 90 100 Maximum
TX DATA OUT D.U.T
1:2.5 P B
55 A Center Tap 1:1.77 for stub coupling
TX DATA OUT RX DATA IN RX DATA IN
P'
B' 55
A'
DUTY CYCLE - PERCENT
Transformer Use Technitrol 1553-45 or Equivalent
Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P
Aeroflex Circuit Technology
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
CIRCUIT TECHNOLOGY
PLUG-IN PACKAGE
1.27 MAX 1.10 24 1.27 MAX 13
Pin Connections
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.
FLAT PACKAGE
1.27 MAX
1
Dot indicates Pin 1 1.27 MAX
0.017 0.002
1.10
1
12
0.10 Typ 0.400 MAX
2 sides
0.175 0.24 MIN 0.018 DIA. 0.002 MAX 0.100
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 0.10.00.002 tolerance, non-cumulative, each row.
Configurations and Ordering Information
Model No.
ACT4419 ACT4419FP
DESC No.
Pending Pending
Receiver Data level
Normally Low Normally Low
Case
Plug In Flat Pack
Specs.
1553 & 1760 1553 & 1760
Configuration
Single 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
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700

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