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
www.aeroflex.com/act1.htm
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
V
EE
RX DATA IN
RX DATA IN
V
CC
STROBE
INPUT
AMP
V-
ACTIVE
FILTER
COMP.
RX DATA OUT
Block Diagram (without Transformer), 1/2 of unit shown
eroflex Circuit T
echnology
– Data Bus Modules For The Future © 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 hot-
test device (100 % duty cycle)
Junction-Case, Thermal resistance for hottest device
-55°C to +125°C
-65°C 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
36°C
60°C/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
V
IN
= 0.4 V
V
IN
= 2.7 V
I
ILD
I
IHD
V
IHD
V
IHD
2.0
Min
Typ
-0.2
1.0
Max
-0.4
40
0.7
Unit
mA
µA
V
V
Inhibit Characteristics
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit(0¡1) to inhibited output
Delay from TX inhibit, (1¡0) to active output
Differential output noise, inhibit mode
Differential output impedance (inhibited)
Note 2
Note 1
Note 1
V
IN
=0.4V
V
IN
=2.7V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
2K
2
300
300
0.8
450
450
10
-0.2
1.0
-0.4
40
0.7
mA
µA
V
V
nS
nS
mV p-p
Ω
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
Delay from 50% point of TX DATA or TX
DATA input to zero crossing of differential
signal. (Note 1)
Aeroflex Circuit Technology
R
L
=35
Ω
V
O
t
r
7
200
7.5
250
9
300
V p-p
nS
R
L
=35
Ω
V
OS
±90
mV peak
t
DTX
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
Z
In
V
IDR
V
ICR
CMRR
Min
20K
10
40
Typ
100K
Max
40
Unit
Ω
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.
V
S
= 0.4 V
V
S
= 2.7V
I
IL
I
IH
V
IL
V
IH
t
SD
2.0
150
-0.2
-1.0
-0.4
+40
0.7
mA
µA
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)
100KHz-
1 MHz
Max R = 8K
Ω
V
TH
R
TH
/V
TH
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
I
OH
= -0.4 mA
I
OL
= 4 mA
Note 1
V
OH
V
OL
t
DRX
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
+V
CC
60mA
80mA
105mA
160mA
-V
EE
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
Aeroflex Circuit Technology
4
SCD4808 REV A 3/9/98
Plainview NY (516) 694-6700
Figure 3 Transmitter (TX) Output Wave form
t
f
*
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 µsec
t
r
*
* 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
70Ω
70Ω
Figure 6 Power Dissipation vs. Duty Cycle
(Per Channel)
4.0
N1:N2
B
52.5Ω
A
Ctr
tap
B’
TX DATA OUT
52.5Ω
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
Ω
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
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