ACT4808 Dual Transceivers for
MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553
Features
• ACT4808 Dual Transceiver meets
MIL-STD-1553A & B, Macair A3818, A5690, A5232
and A4905 specs
•
New
Low Power Model –L Available
• Operates with ±12V to ±15V & +5V Power Supplies
• Voltage source output for higher bus drive power
• Plug-in or Flat Package
• Monolithic construction using linear ASICs
• Processed and Screened to MIL-STD-883 specs
www.aeroflex.com/act1.htm
CIRCUIT TECHNOLOGY
General Description:
The Aeroflex Laboratories transceiver
model ACT4808 is a new generation
Dual monolithic transceiver which
provides full compliance with Macair
and
MIL-STD-1553
data
bus
requirements
The model ACT4808 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553 or
Macair data bus. The ACT4808 can
be
considered
a
"Universal"
Transceiver in that it is compatible
with MIL-STD-1553A & B, Macair
A-3818, A-4905, A-5232 and A-5690.
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. The ACT4808
series active filter design has
additional high frequency roll-off to
provide the required Macair low
harmonic distortion waveform without
increasing
the
pulse
delay
characteristics significantly.
Efficient transmitter electrical and
thermal design provides low internal
power dissipation and heat rise at
high and well as low duty cycles.The
receiver input threshold is set
Internally.
ACT4808 Transceiver
TX DATA OUT
TX DATA IN
TX DATA IN
V+
TX INHIBIT
DRIVER
SHAPING
OUTPUT
STAGE
TX DATA OUT
COMP.
RX DATA OUT
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus as per
Figure 3 or 4 and by two 70 Ohm
terminations (Z
O
), the data bus signal
produced is 6.5 Volts minimum P-P at
A-A’. When both DATA and DATA
+5 V
V
EE
RX DATA IN
RX DATA IN
V
CC
STROBE
INPUT
AMP
V-
ACTIVE
FILTER
COMP.
RX DATA OUT
Block Diagram (without Transformer), 1/2 of unit shown
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCD4808 REV E 12/9/99
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
