CIRCUIT TECHNOLOGY

www.aeroflex.com

eroflex Circuit T

Features

• ARX4435 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

• 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

General Description

The

Aeroflex

Laboratories

Incorporated model ARX4435 and

ARX4435FP

are

new

generation

monolithic

transceivers

which

provides

compliance

with

Macair

H009 data bus requirements

The

model

ARX4435

and

ARX4435FP perform the front-end

analog function of inputting and out-

putting data through a transformer to

a H-009 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 ARX4435

series active filter design has addi-

tional high frequency roll-off to pro-

vide

the

required

low

harmonic

distortion waveform without increas-

ing the delay characteristics signifi-

cantly.

Efficient transmitter electrical and

thermal design results in low internal

power dissipation and temperature

rise at high and low duty cycle.

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 35 Ohm

fault isolation resistors, and loaded by

a 170 Ohm termination, the data bus

signal produced is 20 volts nominal

P-P at A-A’. (See Figure 5.) When

both DATA and DATA inputs are held

low or high, the transmitter output

impedance is low, and signal is

“removed” from the line. In addition,

ARX4435FP/4435 Transceivers

Block Diagram (without Transformer)

SHAPING

OUTPUT

STAGE

COMP.

COMP.

ACTIVE

FILTER

INPUT

AMP

DRIVER

TX 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

-12V or -15V

EXT THRESHOLD

DATA

SET INTERNAL

DATA

DATA

EXT THRESHOLD

DATA

+15V or +12V

V+

V-

THRESHOLD

~4K

~4K

–

+

ARX4435 Transceiver

for Macair H009 Specification