CIRCUIT TECHNOLOGY

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eroflex Circuit T

Features

• 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 Transmitter Output

• Bipolar Monolithic Construction

(BCC++)

General Description

The

Aeroflex

Circuit

Technology

Model

ACT4438-1

is

a

next

generation

monolithic transceiver

which provide full compliance with

MIL-STD-1553/1760 and data bus

requirements

in

a

Bumped

Chip

Carrier™ (BCC++) with the lowest

standby

power

consumption

and

single power supply operation.

The Model ACT4438-1 performs the

front-end analog function of inputting

and

outputting

data

through

a

transformer to a MIL-STD-1553/1760

data

bus

with

a

few

external

components.

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.

Transmitter

The

Transmitter

section

accepts

bi-phase TTL data at the input and

when coupled to the data bus with a

1:2.5 transformer, isolated on the

data bus side with two 55 Ohm fault

isolation

resistors

for

direct

stub

coupling.

The

data

bus

signal

produced for RISET = 2.7K Ohm is

typically 7.5 Volts nominal P-P at

A-A’, See Figure 5. When both DATA

and DATA inputs are held low, 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

priority

over

the

Block Diagram (without Transformer)

ACT4438–1

Transceiver for MIL-STD-1553 / 1760

Preliminary

NOTE: BCC++ and Bumped Chip Carrier are Trademarks of Fujitsu Ltd.

SHAPING

OUTPUT

STAGE

COMP.

COMP.

REFERENCE

ACTIVE

FILTER

TX DATA IN

TX DATA IN

TX INHIBIT

+5 V

STROBE

RX DATA OUT

RX DATA OUT

GROUND

DRIVER

RISET

RX DATA IN

RX DATA IN

INPUT

AMP

TX DATA OUT

TX DATA OUT

in a Chipscale Package

Shown 2X