CIRCUIT TECHNOLOGY
www.aeroflex.com
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4469D REV A 5/21/01
General Description
The Aeroflex Circuit
Technology model ACT4469D is a
next generation monolithic
transceiver which provides variable
amplitude in compliance with H009
data bus requirements with the
lowest standby power consumption
available using three DC power
supplies operation.
The dual channel model
ACT4469D performs the front-end
analog function of inputting and
outputting data through a
transformer to a H009 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.
The ACT4469D series active filter
design provides the required H009
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.
Variable amplitude is adjusted
with factory preset 0–10Vdc control
line at 2 mA maximum input current
at 10 Volts.
Transmitter
The Transmitter section
accepts complementary TTL data
at the input, and when coupled to
the data bus with a 1:1 transformer,
isolated on the transceiver side with
two 34 ohm fault isolation resistors,
and loaded by a 175 ohm
termination, the data bus signal
produced is 20 Volts nominal P-P at
Block Diagram (without Transformer, Channel A shown)

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ACTIVE
AMPLITUDE
STAGE
COMP.
COMP.REFERENCE
ACTIVE
FILTER
DRIVER
TX 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
FILTER
OUTPUT
VARIABLE
TRANSMIT
RECEIVE
+VCC
-VEE
Channel A
Features
World’s smallest and lowest standby power dual
variable amplitude H009 transceiver 1.25" x 0.61"
maximum ceramic package
Dual transceiver with variable output amplitude
control meets McDonnell Douglas H009 data bus
specifications
Lowest standby power
Low power dissipation at full output power
Operates with ±12V to ±15 and +5V power supplies
Voltage source output for transmitter
Monolithic construction
Processed to commercial or screened to
MIL-STD-883 specs
+10V Control line for transmitter amplitude
adjustment (See Figure 3)
Packaging – Hermetic Ceramic
■ Non-conductive mounting surface
■ No package glass beads
■ Small size & light weight
for H009
Dual Variable Amplitude Transceivers
ACT4469D