ACT4418 Aeroflex Circuit Technology, ACT4418 Datasheet - Page 2

• Manufacturer Part Number: ACT4418
• Description: Act4418 Molded Dual Variable Amplitude Transceivers For MacaIR A3818, A5690, A5232, A4905 & Mil-std-1553
• Manufacturer: Aeroflex Circuit Technology

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,
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
forms,Figure 1.)
filter to suppress harmonics above
The transmitter utilizes an active
Aeroflex Circuit Technology
Figure 1 Transmitter Logic Waveforms
DATA IN
DATA IN
INHIBIT
LINE TO LINE
LINE TO LINE
DATA OUT
DATA OUT
OUTPUT
Figure 2 Receiver Logic Waveforms
NOTES:
INPUT
Transmitter
the
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).
NOTE
transmitter
:
Waveforms shown are for normally low devices. For normally high receiver output
level
Logic
devices, the receiver outputs are swapped as shown by the dashed lines
Wave-
output
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:
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.
Figure 2.)
The Receiver section accepts bi-
(See Receiver Logic Waveforms,
The internal threshold is nominally
2
Note overlap
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).
inhibits the DATA and DATA out-
puts. If unused, a 2K pull-up to +5
Volts is recommended
A low level at the Strobe input
SCD4418D Rev A 9/24/97 Plainview NY [phone]