ARX4417 Aeroflex Circuit Technology, ARX4417 Datasheet - Page 2

• Manufacturer Part Number: ARX4417
• Description: Arx 4418 & 4417 Variable Amplitude Transceivers For MacaIR A3818, A5690, A5232, A4905 & Mil-std-1553
• Manufacturer: Aeroflex Circuit Technology

Transmitter
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
minimum
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
The Transmitter section accepts
NOTES:
Aeroflex Circuit Technology
Figure 1 – Transmitter Logic Waveforms
DATA IN
DATA IN
INHIBIT
LINE TO LINE
Figure 2 – Receiver Logic Waveforms
LINE TO LINE
DATA OUT
DATA OUT
OUTPUT
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).
INPUT
produced
P-P
NOTE
at
:
Waveforms shown are for normally low devices. For normally high receiver output
is
level
A-A’.
devices, the receiver outputs are swapped as shown by the dashed lines
7.0
(See
volts
priority over the condition of the data
inputs and disables the transmitter.
(See Transmitter Logic Waveforms,
Figure 1.)
filter to suppress harmonics above
1MHz to meet Macair specifications
A-3818,
A-5690. The transmitter may be
safely operated for an indefinite
period at 100% duty cycle into a
data bus short circuit.
Receiver
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
The transmitter utilizes an active
The Receiver section accepts
A-4905,
2
A-5232
and
Note overlap
beyond a pre-determined threshold.
(See Receiver Logic Waveforms,
Figure 2.)
set to detect data bus signals
exceeding 1.05 Volts P-P and reject
signals less than 0.6 volts P-P when
used
transformer. (See Figure 5 for
transformer
connection.) This threshold setting
can be held by grounding the
appropriate pins or modified with the
use of external resistors.
inhibits the DATA and DATA outputs.
If unused, a 2K pull-up to +5 Volts is
recommended.
The internal threshold is nominally
A low level at the Strobe input
SCD4418 REV B 10/18/99 Plainview NY [phone]
with
a
data
1:1
and
turns
typical
ratio