ACT ARX4418-LPFP, ARX4418-FP, ARX4418, ARX4417-LPFP, ARX4417-FP Datasheet

eroflex Circuit T

– Data Bus Modules For The Future © SCD4418 REV B 10/18/99

EX THRESHOLD

EX THRESHOLD

ARX 4418 & 4417 Variable Amplitude Transceivers for

MACAIR A3818, A5690, A5232, A4905

& MIL-STD-1553

Features

• ARX 4418 Transceiver meets MIL-STD-1553A&B,
Macair A3818, A4905, A5232 and A5690 specs

• ARX 4417 Transceiver meets MIL-STD-1553 specs

• Operates with ±15 Volts to ±12 Volts power supply

• Voltage source output for higher bus drive power

• Plug-in, flat package or low profile flat package

• Monolithic construction using linear ASICs

• Variable receiver threshold capability

• Variable TX Amplitude

• Processed and screened to Mil-STD-883 specs

• DESC SMD (Standard Military Drawing)

ARX 4418FP/4418 Transceivers

TX DATA IN

TX DATA IN

TX INHIBIT

DATA

SET INTERNAL
THRESHOLD

DATA

+5 V

-12V or -15V

RX DATA IN

RX DATA IN

+15V or +12V

STROBE

DATA

DATA

DRIVER

INPUT
AMP

SHAPING

V-

ACTIVE
FILTER

OUTPUT
STAGE

V+

COMP.

COMP.

Block Diagram (without Transformer)

TX DATA OUT

TX DATA OUT

AMP CONTROL

RX DATA OUT

RX DATA OUT

CIRCUIT TECHNOLOGY

www.aeroflex.com

General Description

The Aeroflex Laboratories
transceiver models ARX 4418 and
ARX 4417 are new generation
monolithic transceivers which provide
full compliance with Macair and
MIL-STD-1553data bus requirements
while providing variable amplitude
control.

The model ARX 4418 and model
ARX 4417 perform the front-end
analog function of inputting and
outputting data through a transformer
to a MIL-STD-1553 or Macair data
bus. The ARX 4418 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. The
ARX 4417 is compatible with
MIL-STD-1553A/B.

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. The ARX4418
series active filter design has
additional high frequency roll-off to
provide the required Macair low
harmonic distortion waveform without
increasingthepulsedelaycharacteris­tics significantly.

Efficient transmitter electrical and
thermal design provides low internal
power dissipation and heat rise at
high and well as low duty cycles.

Variable amplitude is adjusted with
0–10 Vdc on the control pin. An
optional receiver input threshold
adjustment can be accomplished by
the use of the "Set Internal
Threshold" terminals.

echnology

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 receivers, the data bus
signal produced is 7.0 volts
minimum P-P at A-A’. (See
Figure5.) When both DATA and

inputs are held low or high,

DATA
the transmitter output becomes a
high impedance and is “removed”
from the line. In addition, an
overriding “INHIBIT" input provides
for the removal of the transmitter
output from the line. A logic “1”
applied to the “INHIBIT” takes

Figure 1 – Transmitter Logic Waveforms

priority over the condition of the data
inputs and disables the transmitter.
(See Transmitter Logic Waveforms,
Figure1.)

The transmitter utilizes an active
filter to suppress harmonics above
1MHz to meet Macair specifications
A-3818, A-4905, A-5232 and
A-5690. The transmitter may be
safely operated for an indefinite
period at 100% duty cycle into a
data bus short circuit.

Receiver

The Receiver section accepts
bi-phase differential data at the input
and produces two TTL signals at the
output. The outputs are DATA and

, and represent positive and

DATA
negative excursions of the input

beyond a pre-determined threshold.
(See Receiver Logic Waveforms,
Figure 2.)

The internal threshold is nominally
set to detect data bus signals
exceeding 1.05 Volts P-P and reject
signals less than 0.6 volts P-P when
used with a 1:1 turns ratio
transformer. (See Figure 5 for
transformer data and typical
connection.) This threshold setting
can be held by grounding the
appropriate pins or modified with the
use of external resistors.

A low level at the Strobe input
inhibits the DATA and DATA

outputs.
If unused, a 2K pull-up to +5 Volts is
recommended.

DATA IN

IN

DATA

INHIBIT

LINE TO LINE

OUTPUT

NOTES:

1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal

2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.

3. DATA and DATA must be in the same state during off time (both high or low).

Figure 2 – Receiver Logic Waveforms

LINE TO LINE
INPUT

DATA OUT

DATA OUT

NOTE: Waveforms shown are for normally low devices. For normally high receiver output

level

Aeroflex Circuit Technology SCD4418 REV B 10/18/99 Plainview NY [phone]

devices, the receiver outputs are swapped as shown by the dashed lines

2

Note overlap