ACT ARX4435N-FP, ARX4435N Datasheet

Features

ARX4435N Transceiver

for Macair H009 Spec ificat ion

Preliminary

• ARX4435N transceiver meets Macair H009 data bus
specifications

• Transmitter can be used to drive clock signal line

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

• Low power direct replacement for CT1641 and CT1816
devices

• Voltage source output for higher bus drive power

• Plug-in and flat package available

• Monolithic construction using linear ASICs

• Processed and screened to MIL-STD-883 specs

• MIL-PRF-38534 compliant devices available

AEROFLEX

AEROFLEX

ARX 4435NFP

USA-88379

ARX4435NFP / ARX4435N Tran sceiv er s

ARX 4435N

USA-88379

CIRCUIT TECHNOLOGY

www.aeroflex.com

General Description

The Aeroflex Laboratories
Incorporated model ARX4435N and
ARX4435NFP are new generation
monolithic transceivers which
provides compliance with Macair
H009 data bus requirements.

The ARX4435N and ARX4435NFP
perform the front-end analog function
of inputting and outputting data
through a transformer to a H009 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. The ARX4435N
series active filter design has
additional high frequency roll-off to
provide the required low harmonic
distortion waveform without
increasing the delay characteristics
significantly.

Efficient transmitter electrical and
thermal design results in low internal
power dissipation and temperature
rise at high and low duty cycle.

TX DATA IN
TX DATA IN

TX INHIBIT

EXT THRESHOLD

DATA

SET INTERNAL
THRESHOLD

EXT THRESHOLD

DATA

-12V or -15V
RX DATA IN
RX DATA IN

+15V or +12V

STROBE

DATA
DATA

+5 V

eroflex Cir cu it T

DRIVER

INPUT

AMP

+VTH

-VTH

SHAPING

–

~4K

+

~4K

V-

ACTIVE
FILTER

V+

+
–

Block Diagram (without Transformer)

echnology

– Data Bus Modules For The Future © SCD4435N REV A 7/27/00

OUTPUT
STAGE

COMP.

COMP.

TX DATA OUT
TX DATA OUT

RX DATA OUT

RX DATA OUT

Transmitter

The Transmitter section accepts
complement ary TT L data at the input,
and when coupled to the data bus
with a 1:1 transformer, isolated on the
transceiver side with two 35 Ohm
fault isolation resistors, and loaded by
a 170 Ohm ter mination, the data bus
signal produced is 20 Volts nominal
P-P at A-A’. (See Figure 5.) When
both DATA and DATA
low or high, the transmitter output
impedance is low, and signal is
“removed” from the line. In addition,

inputs are held

an overriding “INHIBIT” input returns the output
impedance to a high state. A logic “1” applied to the
“INHIBIT” takes priority over the condition of the data
inputs and disables the transmitter (See Transmitter
Logic Waveforms, Figure 1).

The transmitter utilizes an active filter to suppress
harmonics above 1 MHz to meet H009 Macair
specifications. The transmitter may be safely operated
for an indefinite period wi th the output shor t circuited
at 100% duty cycle.

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 DATA

Figure 1 - Transmitter Logic Waveforms

Region 1 2 3

DATA IN

, and

represent positive and 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).

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

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

recommended.

DATA IN

INHIBIT

LINE TO LINE

OUTPUT

Notes: 1. Data and DATA inputs must be complementry waveforms or 50% duty cycle average, with no delays between them, and in the same state during

the off time (both high and low).

2. Region 1 ; no output signal, High Z state, (Receive Mode), Region 2; No Output signal, Low Z state, (Terminate Mode), Region 3, T ransmitter signal
on, low Z.

Figure 2 - Receiver Logic Waveforms

LINE TO LINE

INPUT

Rx DATA OUT

Rx DATA

Aeroflex Circuit Technology SCD4435N REV A 7/27/00 Plainview NY [phone]

OUT

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

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

level

2

Note overlap