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ARX4808 Dual Transceivers for MACAIR A3818, A5690, A5232, A4905 & MIL-STD-1553
Features
* ARX4808 Dual Transceiver meets MIL-STD-1553A & B, Macair A3818, A5690, A5232 and A4905 specs * Operates with 12 V to 15 V & +5 V Power Supplies * Voltage source output for higher bus drive power * Plug-in or Flat Package * Monolithic construction using linear ASICs * Low receiver data level version, ARX4868 * Processed and Screened to MIL-STD-883 specs * DESC SMD (Standard Military Drawing ) Pending
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CIRCUIT TECHNOLOGY
General Description:
The Aeroflex Laboratories transceiver model ARX4808 is a new generation Dual monolithic transceiver which provides full compliance with Macair and MIL-STD-1553 data bus requirements The model ARX4808 performs the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553 or Macair data bus. The ARX4808 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 this transceiver 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 ARX4808 series 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.The receiver input threshold is set Internally.
ARX4808 Transceiver
TX DATA OUT TX DATA IN TX DATA IN TX INHIBIT DRIVER SHAPING V+ OUTPUT STAGE TX DATA OUT
COMP.
RX DATA OUT
Transmitter
The Transmitter section accepts bi-phase 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 Ohm terminations plus additional
+5 V VEE RX DATA IN RX DATA IN VCC STROBE INPUT AMP
V-
ACTIVE FILTER
COMP.
RX DATA OUT
Block Diagram (without Transformer), 1/2 of unit shown
eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4808 REV A 3/9/98
receivers, the data bus signal produced is 7.5 volts minimum 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 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 A-5690. The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit.
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 Waveforms, Figure 2.)
The internal threshold is nominally 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
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
SCD4808 REV A 3/9/98
Plainview NY (516) 694-6700
Absolute Maximum Ratings, Per Channel
Operating case temperature Storage case temperature Power supply Voltages Logic input Voltage Receiver differential input Receiver input voltage (common mode) Driver peak output current Total package power dissipation over the full operating case temperature range Power Dissipation for hottest die, (100% duty cycle) Maximum junction to case temperature rise for the hottest device (100 % duty cycle) Junction-Case, Thermal resistance for hottest device -55C to +125C -65C to +150 C 15 V P.S. to 18V MAX +5 V P.S. to +7V MAX -0.3 V to +5.5 V 40 V 10V 300 mA 2.4 Watts 600 mW 36C 60C/W
Electrical Characteristics Per Channel, Transmitter Section
Input Characteristics, TX DATA in or TX DATA in Parameter Condition Symbol
"0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage VIN = 0.4 V VIN = 2.7 V IILD IIHD VIHD VIHD 2.0
Min
Typ
-0.2 1.0
Max
-0.4 40 0.7
Unit
mA A V V
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 IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI 2K 2 300 300 0.8 450 450 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. (Note 1)
Aeroflex Circuit Technology
RL=35
VO tr
7 200
7.5 250
9 300
V p-p nS
RL=35
VOS
90
mV peak
tDTX
3
240
300
nS
SCD4808 REV A 3/9/98
Plainview NY (516) 694-6700
Electrical Characteristics Per Channel, Receiver Section
Parameter
Differential Input Impedance Differential Input Voltage Range Input Common Mode Voltage Range Common Mode Rejection Ratio Note 1 Note 1
Condition
f = 1MHz
Symbol
ZIn VIDR VICR CMRR
Min
20K 10 40
Typ
100K
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)pins 6 and 11 grounded External threshold control ( pins 6&11 open, resistors from pin 5 and 12 to ground) 100KHz1 MHz Max R = 8K VTH RTH /VTH 0.60 0.8 4000 1.15 V P-P Ohms /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 Supply Currents Per Channel (Power supplies set at +15V, -15V, +5V)
Duty Cycle
Transmitter Standby or 1% Duty Cycle 25% duty cycle 50% duty cycle 100% duty cycle Note 1 Note 1
+VCC
60mA 80mA 105mA 160mA
-VEE
75mA 95mA 120mA 180mA
5V
35mA
Recommended Power Supply Voltage Range
+V -V Logic +11.4 Volts to +15.75 Volts -11.4 Volts to -15.75 Volts +4.5 Volts to + 5.5 Volts
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4
SCD4808 REV A 3/9/98
Plainview NY (516) 694-6700
Figure 3 Transmitter (TX) Output Wave form
tf* 90%
Figure 4 Transmitter (TX) Output offset
LAST BIT
Magnified View
OUTPUT OFFSET*
6.5V P-P MIN 8.5V 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
Figure 6 Power Dissipation vs. Duty Cycle (Per Channel)
4.0 N1:N2 B 52.5 A Ctr tap B' TX DATA OUT 52.5 RX DATA IN RX DATA IN Transformer turns ratios: N1:N2 = 1:1 N1:N3 = 1:0.71 Use Aeroflex 25T1553-1 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE, PERCENT A' N1:N3 for stub coupling POWER DISSIPATION WATTS 3.5 3.0 2.5 (TYPICAL) 2.0 1.5 1.0 0.5
TX DATA OUT
NOTES 1. Characteristics guaranteed by design, not production tested. 2. Measured from 75kHz to 1MHz at point A-A' with transformer self impedance of 3K minimum, power on or off
Configurations and Ordering Information
Model No.
ARX4808 ARX4808-2 ARX4868 ARX4868-2
DESC No.
TBA TBA TBA TBA
Receiver Data level
Normally High Normally High Normally Low Normally Low
Case
Plug In Flat Pack Plug In Flat Pack
Aeroflex Circuit Technology
5
SCD4808 REV A 3/9/98
Plainview NY (516) 694-6700
CIRCUIT TECHNOLOGY
Dual In Line
1.90 MAX 0.085 .097 36 0.78 MAX 18 Pin 1 & ESD Designator 0.24 MIN 1.70 19 0.600
Pin Numbers & Functions
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
18
Function TX DATA OUT TX DATA OUT GROUND NC RX DATA OUT STROBE GROUND RX DATA OUT CASE TX DATA OUT TX DATA OUT GROUND NC RX DATA OUT STROBE GROUND RX DATA OUT NC VCC RX DATA IN RX DATA IN GROUND 3 VEE +5V INHIBIT TX DATA IN TX DATA IN VCC RX DATA IN RX DATA IN GROUND VEE +5 V INHIBIT TX DATA IN TX DATA IN
Channel A A A A A A A B B B B B B B B B B B B B B B B A A A A A A A A A
0.018 DIA. 0.002
Flat Package
0.78 MAX
19
16
0.015 0.002
17 18 19 20
1.90 MAX 0.10 Typ
21 22 23 24
36
0.086 R 4 Places Pin 1 & ESD Designator 0.010 0.002
25 26 27 28 29 30 31 32 33 34 35 36
0.097
0.175 MAX
0.40 MIN 2 SIDES
0.065 REF
Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.1000.002 tolerance, non-cumulative, each row 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
SCD4808 REV A 3/9/98 Plainview NY (516) 694-6700

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