ARX4808 Aeroflex Circuit Technology, ARX4808 Datasheet - Page 2

• Manufacturer Part Number: ARX4808
• Description: Varx4808 Dual Transceivers For Macair A3818, A5690, A5232, A4905 & Mil-std-1553
• Manufacturer: Aeroflex Circuit Technology

Aeroflex Circuit Technology
receivers,
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
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
NOTES:
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
INPUT
overriding
2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal
3. DATA and DATA must be in the same state during off time (both high or low).
the
NOTE
data
:
“INHIBIT"
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
bus
signal
input
1 MHz 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
The
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.)
Receiver
A-4905,
2
section
A-5232
accepts
and
Note overlap
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
SCD4808 REV A 3/9/98
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