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ACT4418 Datasheet(PDF) 2 Page - Aeroflex Circuit Technology

Part No. ACT4418
Description  ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818, A5690, A5232, A4905 & MIL-STD-1553
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Manufacturer  AEROFLEX [Aeroflex Circuit Technology]
Direct Link  http://www.aeroflex.com
Logo AEROFLEX - Aeroflex Circuit Technology

ACT4418 Datasheet(HTML) 2 Page - Aeroflex Circuit Technology

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Aeroflex Circuit Technology
SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700
2
Ohm terminations plus additional
receivers, the data bus signal pro-
duced is 7.5 volts typical 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 pro-
vides for the removal of the trans-
mitter 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
Wave-
forms,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 trans-
former (See Figure 5 for transformer
data and typical connection).
A low level at the Strobe input
inhibits the DATA and DATA out-
puts. If unused, a 2K pull-up to +5
Volts is recommended
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
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 1 Transmitter Logic Waveforms
Figure 2 Receiver Logic Waveforms
Note overlap
NOTE: Waveforms shown are for normally low devices. For normally high receiver output
devices, the receiver outputs are swapped as shown by the dashed lines
level
LINE TO LINE
INPUT
DATA OUT
DATA OUT
1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal


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