CIRCUIT TECHNOLOGY
www.aeroflex.com
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4419D REV G 5/10/00
Features
• World’s smallest and lowest standby power dual variable
amplitude transceiver 0.3" x 1.2" packages
• Lowest standby power
• Dual transceiver meets military data bus requirements,
MIL-STD-1553
• 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 300 KRADS total dose
• DESC SMD pending
• +5V Control line
General Description
The Aeroflex Circuit Technology
model ACT4419D is a next
generation D.I. monolithic
transceiver which provides
variable amplitude in full
compliance with MIL-STD-1553
data bus requirements with the
lowest standby power
consumption available and one
power supply operation.
The dual channel model
ACT4419D performs the front-end
analog function of inputting and
outputting data through a
transformer to a MIL-STD-1553
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 – 5 Vdc
control line at 1 mA maximum
input current at 5 Volts.
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 additionalBlock Diagram (without Transformer, Channel A shown)

SHAPING OUTPUT STAGE
COMP.
COMP.REFERENCE
ACTIVE
FILTER
DRIVERTX DATA IN
TX DATA IN
TX INHIBIT
+5 V
STROBE
TX/RX
TX/RX
RX DATA OUT
RX DATA OUT
GROUND
VCONTChannel B
INPUT
AMP
Channel A
Channel B
for MIL-STD-1553
Dual Variable Amplitude Transceivers
ACT4419D Dual Transceivers
ACT4419D