ACT ACT4419FP, ACT4419 Datasheet
ACT4419FP & ACT4419 Plug In Transceivers
ACT4419
Single Supply Variable Amplitude Transceivers
for MIL-STD-1553
Features
Preliminary
• First fully monolithic 5V only Variable Amplitude
Transceiver
• Lowest standby power
• Transceiver meets military data bus requirements,
MIL-STD-1553 and MIL-STD-1760
• Low power dissipation at full output power
• Single +5V power supply
• Current source output
• Monolithic construction using dielectrically isolated(D.I.)
• Processed and screened to MIL-STD-883 specs
• Radiation Hard to 2.5 MRADS Total Dose
• DESC SMD pending
• Either 5V or 10V DC control line (Factory Set)
CIRCUIT TECHNOLOGY
www.aeroflex.com
General Description
The Aeroflex Circuit Technology
model ACT4419 is a next generation
D.I. monolithic transceiver which
provides variable amplitude in full
compliance with MIL-STD-1553/1760
data bus requirements with the lowest
standby power consumption available
and one power supply operation.
The model ACT4419 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553/1760
data bus.
Design of these transceivers reflects
particular attention to active filter
performance. This results in low bit
and word error rate with superior
waveform purity and minimal zero
crossover distortion. Efficient
transmitter electrical and thermal
design provides low internal power
dissipation and heat rise at high as
well as low duty cycles.
Variable amplitude is adjusted with
factory preset 0 - 10 Vdc or 0 - 5 Vdc
control line at 1mA maximum input
current.
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
primary grounded center tap
1:2.5
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
produced is 7.5Volts nominal P-P at
A-A’ (See Figure 5). When both DATA
and DATA
the transmitter output becomes a
inputs are held low or high,
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
GROUND
STROBE
DRIVER
INPUT
AMP
SHAPING
REFERENCE
ACTIVE
FILTER
OUTPUT
STAGE
COMP.
COMP.
TX/RX
TX/RX
RX DATA OUT
RX DATA OUT
high impedance and is “removed”
Block Diagram
from the line. In addition, an
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4419 REV B 10/21/99
Aeroflex Circuit Technology
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
CIRCUIT TECHNOLOGY
level devices, the receiver outputs are swapped as shown by the dashed lines.
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.
Figure 1 - Transmitter Logic Waveforms
DATA IN
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
, and represent positive and
DATA
negative excursions of the input
beyond a pre-determined threshold.
(See Receiver Logic Waveform.
Figure 2).
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 Figure 5 for transformer data
and typical connection).
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
1.DATA and DATA
2.DATA and DATA
inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
must be in the same state during off time (both high or low).
Figure 2 - Receiver Logic Waveforms
LINE TO LINE
INPUT
DATA OUT
OUT
DATA
NOTE: Waveforms shown are for normally low devices. For normally high receiver output
Note overlap
2
Loading...