CIRCUIT TECHNOLOGY
www.aeroflex.com
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4438-1 REV A 11/19/01
Features
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 Transmitter Output
Bipolar Monolithic Construction
Miniature Chipscale Package Bumped Chip Carrier™
(BCC++)
General Description
The Aeroflex Circuit Technology
Model ACT4438-1 is a next
generation monolithic transceiver
which provide full compliance with
MIL-STD-1553/1760 and data bus
requirements in a Bumped Chip
Carrier™ (BCC++) with the lowest
standby power consumption and
single power supply operation.
The Model ACT4438-1 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553/1760
data bus with a few external
components.
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.
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
1:2.5 transformer, isolated on the
data bus side with two 55 Ohm fault
isolation resistors for direct stub
coupling. The data bus signal
produced for RISET = 2.7K Ohm is
typically 7.5 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
Block Diagram (without Transformer)
ACT4438–1
Transceiver for MIL-STD-1553 / 1760
Preliminary
NOTE: BCC++ and Bumped Chip Carrier are Trademarks of Fujitsu Ltd.
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SHAPING
OUTPUT
STAGE
COMP.
COMP.REFERENCE
ACTIVE
FILTER
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
STROBE
RX DATA OUT
RX DATA OUT
GROUND
DRIVER
RISET
RX DATA IN
RX DATA IN
INPUT
AMP
TX DATA OUT
TX DATA OUT
in a Chipscale Package
Shown 2X