eroflex Circuit Technology – Data Bus Modules For The Future © SCD4808 REV A 3/9/98
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
Features
• ARX4808 Dual Transceiver meets
MIL-STD-1553A&B, Macair A3818, A5690, A5232
and A4905 specs
• Operates with ±12 V to ±15 V & +5 V Power Supplies
• Voltage source output for higher bus drive power
• Plug-in or Flat Package
• Monolithic construction using linear ASICs
• Low receiver data level version, ARX4868
• Processed and Screened to MIL-STD-883 specs
• DESC SMD (Standard Military Drawing ) Pending
General Description:
The Aeroflex Laboratories transceiver
model ARX4808 is a new generation
Dual monolithic transceiver which
provides full compliance with Macair
and MIL-STD-1553 data bus
requirements
The model ARX4808 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553 or
Macair data bus. The ARX4808 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 ARX4808
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.
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
1:1 transformer, isolated on the data
bus side with two 52.5 Ohm fault
isolation resistors, and loaded by two
70 Ohm terminations plus additional
ARX4808 Transceiver
Block Diagram (without Transformer), 1/2 of unit shown

SHAPING OUTPUT STAGE
COMP.
COMP.
ACTIVE
FILTER
INPUT
AMP
DRIVERTX DATA IN
TX DATA IN
TX INHIBIT
+5 V
RX DATA IN
RX DATA IN
STROBE
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
VEE
VCC
V+
V-
ARX4808 Dual Transceivers for
MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553