5962-TBD Ver la hoja de datos (PDF) - Aeroflex Corporation

Número de pieza

componentes Descripción

Fabricante

5962-TBD

ARX 4418 & 4417 Variable Amplitude Transceivers for & MIL-STD-1553 MACAIR A3818, A5690, A5232, A4905

Aeroflex Corporation 

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

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

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 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

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

DATA, 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.) 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.

Figure 1 – Transmitter Logic Waveforms

DATA IN

DATA IN

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 overlap

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

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

Aeroflex Circuit Technology

2

SCD4418 REV B 10/18/99 Plainview NY (516) 694-6700

Share Link: