CIRCUIT TECHNOLOGY

www.aeroflex.com

eroflex Circuit T

Features

• First fully monolithic 5V only Variable Amplitude

Transceiver

• Lowest standby power

• Transceiver meets military data bus requirements,

MIL-STD-1553 and MIL-STD-1760

• 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 2.5 MRADS Total Dose

• DESC SMD pending

• Either 5V or 10V DC control line (Factory Set)

General Description

The

Aeroflex

Circuit

Technology

model ACT4419 is a next generation

D.I.

monolithic

transceiver

which

provides variable amplitude in full

compliance with MIL-STD-1553/1760

data bus requirements with the lowest

standby power consumption available

and one power supply operation.

The model ACT4419 performs the

front-end analog function of inputting

and

outputting

data

through

a

transformer to a MIL-STD-1553/1760

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 - 10 Vdc or 0 - 5 Vdc

control line at 1mA maximum input

current.

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

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 7.5Volts nominal P-P at

A-A’ (See Figure 5). When both DATA

and DATA inputs are held low or high,

the transmitter output becomes a

high impedance and is “removed”

from

the

line.

In

addition,

an

Block Diagram

ACT4419FP & ACT4419 Plug In Transceivers

SHAPING

OUTPUT

STAGE

COMP.

COMP.

REFERENCE

ACTIVE

FILTER

INPUT

AMP

DRIVER

TX DATA IN

TX DATA IN

TX INHIBIT

+5 V

STROBE

TX/RX

TX/RX

RX DATA OUT

RX DATA OUT

GROUND

for MIL-STD-1553

Single Supply Variable Amplitude Transceivers

ACT4419

Preliminary