CIRCUIT TECHNOLOGYwww.aeroflex.com/act1.htm
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4436D REV B 3/10/98
General Description
TheAeroflexCircuitTechnology
ACT 4436 is a next generation
monolithic transceiver design
which provides full compliance to
MIL-STD-1553A/Band1760re-
quirements in a smaller package
with lower pin count then the
ACT4487D, for those designs with
less board space.
The ACT4436 series performs
the front-end analog function of
inputting and outputting data
through a transformer to the
MIL-STD-1553 data bus.
Design of this transceiver 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
1.4:1 ratio transformer, isolated on
the data bus side with two 52.5
Ohm fault isolation resistors, and
loaded by two 70 Ohm
terminations, the data bus signal is
typically 7.5 Volts P-P at point A
(See Figure5). 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,
Block Diagram (Without Transformer)
ACTIVE OUTPUT
STAGE
COMP.
COMP.REFERENCE
ACTIVE
FILTER
INPUT
AMPLIFIER
DRIVER
TX DATA IN
TX DATA IN
TX INHIBIT IN
-15V (VEE)
RX DATA IN
RX DATA IN
RX STROBE IN
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
FILTER
GND3
+5V (VL)
GND1
+15V (VCC)
GND2
CASE
Features
a35 Smaller Case Outline than ACT4487D
• +5 / ±15 Volt Supply Operation
• Low Power Dissipation
• Outstanding MIL-STD-1553 performance
• Radiation Hard Dielectric Isolation Monolithic
Construction for Severe Environments
• Input and Output TTL Compatible Design
• Processed and Screened to MIL-STD-883 Specs
• MIL-PRF-38534 Compliant Devices Available
• DESC SMD# 5962-89447
ACT 4436 DUAL TRANSCEIVER
FOR MIL-STD-1553/1760