ACT4419D Просмотр технического описания (PDF) - Aeroflex Corporation
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ACT4419D Datasheet PDF : 6 Pages
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receivers, the data bus signal
produced is 7.1 Volts nominal
P-P at A-A’ (See Figure 5).
When both DATA and DATA
inputs are held low, 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 1MHz. The Transmitter
may be safely operated at 100%
duty cycle for an indefinite period
into a short circuited 1553 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).
Note: Receiver outputs are
normally low.
CIRCUIT TECHNOLOGY
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 1:2.5 turns
ratio
transformer.
(See
transformer data and typical
connection, Figure 5).
Figure 1 - Transmitter Logic Waveforms
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
1. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
2. DATA and DATA must be in the same state during off time (both low).
Figure 2 - Receiver Logic Waveforms
LINE TO LINE
INPUT
DATA OUT
DATA OUT
Aeroflex Circuit Technology
Note overlap
2
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