• Dual transceiver meets military data bus
requirements, MIL-STD-1553 and Macair specs
• Low power dissipation at full output power
• +5 / -15 Volt Power Supply Operation
• Voltage source output for higher bus drive power
• Monolithic construction using linear ASICs
• Processed and screened to MIL-STD-883 specs
• MIL-PRF-38534 Compliant Devices Available
• DESC SMD (Standard Military Drawing)
AEROFLEX
ARX 4810
USA-88379
ARX4810 Dual Universal Transceiver
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
-15 V to -12V
GROUND
STROBE
DRIVER
INPUT
AMP
SHAPING
REFERENCE
ACTI VE
FILTER
OUTPUT
STAGE
COMP.
COMP.
Block Diagram (without transformer), 1/2 of unit shown
TX/RX
TX/RX
RX DATA OUT
RX DATA OUT
CIRCUIT TECHNOLOGY
www.aeroflex.com
General Description
The Aeroflex Circuit Technology
Models ARX4810 and ARX4810FP
are new generation monolithic
transceivers which provide full
compliance with MIL-STD-1553 and
Macair data bus requirements in the
smallest packages with low power
consumption and two power supply
operation.
The dual channel Model ARX4810
and Model ARX4810FP perform the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553 or
Macair 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.
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.
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
receivers, the data bus signal
produced is 7.5 volts 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 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
Figure 1 – Transmitter Logic Waveforms
DATA IN
1 MHz to meet Macair specifications
A-3818, A-4905, A-5232 and
A-5690. The Transmitter may be
safely operated at 100% duty
cyclefor an indefinite period into a
short circuited, the 1553 or Macair
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 1:1 turns ratio transformer.
(See Figure 5 for transformer data
and typical connection.)
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
1. DATA and DATA
2. DATA and DATA
inputs must be complementar y waveforms or 50% duty cycle average, with no delays between them.
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: Waveforms shown are for normally low devices. For nor mally high receiver output
level devices,
,
Aeroflex Circuit Technolo gySCD4810 REV B 8/12/98 Plainview NY (516) 694-6700
the receiver outputs are swapped as shown by the dashed lines.
2
Note overlap
Page 3
Absolute Maximum Ratings
Operating case temperature-55°C to +125°C
Storage case temperature-65°C to +150 °C
Negative Power supply Voltage-15 V P.S. to -18V MAX
Positive Power Supply Voltage-0.3 V to +5.5 V
Receiver differential input±10 V
Receiver input voltage (common mode)±5 V
Driver peak output current300 mA
Total package power dissipation over the full operating case
temperature rise
Maximum junction to case temperature rise for the hottest
device
Thermal resistance for the hottest device, junction to bottom of
case
(Note. Normal operation conditions require one transmitter on and the
other off at any given time, with a maximum dissi pation of 3.2 watts.
4 Watts
6° C
3° C/W
Electrical Characteristics, Driver Section
Input Characteristics, TX DATA in or TX DATA in
ParameterConditionSymbolMinTypMaxUnit
)
"0" Input CurrentVIN = 0.4 VI
"1" Input CurrentV
IN
= 2.7 VI
"0" Input VoltageV
"1" Input VoltageV
ILD
IHD
IHD
IHD
-0.25-0.4mA
140 µA
0.7V
2.0V
Inhibit Characteristics
"0" Input CurrentVIN = 0.4VI
"1" Input CurrentV
IN
= 2.7VI
"0" Input VoltageV
"1" Input VoltageV
Delay from TX inhibit,(0→1) to inhibited outputNote 1
Delay from TX inhibit, (1→0) to active outputNote 1
Differential output noise, inhibit modeV
Differential output impedance (inhibited)Note 2Z
Note 1. Characteristics guaranteed by design, not production tested .
ILI
IHI
ILI
IHI
DXOFF
t
DXON
t
NOI
OI
-0.25-0.4mA
1.040µA
0.7V
2V
240350nS
210350nS
210mV p-p
7K
Output Characteristics
Differential output levelRL = 35Ω VO66.87.7V p-p
Ω
Rise and fall times
(10% to 90% of p-p output)
R
t
200240300nS
Output offset at point A-A’ on Fig 5., 2.5 µS after
midpoint crossing of the parity bit of the last word
L
= 35Ω V
R
OS
±90mV peak
of a 660µS message
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
Note 1
DTX
t
260350nS
Note 2. Measured at 1MHz from bus side of transformer after contribution from transformer is accounted for.
Aeroflex Circuit TechnologySCD4810 REV B 8/12/98 Plainview NY (516) 694-6700
Delay, (average) from differential input zero crossings to RX DATA
and RX DATA output 50% points
DRX
t
280450nS
Power Data
Maximum Currents, per channel (Power supplies used are -15V, and +5V)
Duty Cycle-V+V and Logic
Transmitter Standby 42 mA48 mA
25% duty cycle, Note 185mA90 mA
50% duty cycle105 mA110 mA
100% duty cycle, Note 1140 mA145 mA
Power supply Voltages
-V-14.25 Volts to -15.75 Volts
Logic and +V4.5 Volts to 5.5 Volts
Note 3. Measured at the bus side of the transformer, including the contribution from the transformer.
Note 4. V
Note 5. Specifications apply over the case temperature range of -55°C to +125°C unless otherwise specfied.
Note 6. All typical values are measured at +25°C
Note 7. A 1uf, 10 Volt capacitor is required on the TX/RX terminal for each transceiver as shown in Figure 5. A Sprague
194D type (.05" W x .10" L x .05" H ) is suggested.
= 5 Volts ±0.1 V, for all measurements unless otherwise specified.
cc
Aeroflex Circuit TechnologySCD4810 REV B 8/12/98 Plainview NY (516) 694-6700