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ACT4468DFI

Dual Transceivers for MIL-STD-1553

Aeroflex Corporation 

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 Waveform,

Figure 1.)

The transceiver utilizes an active

filter to suppress harmonics above

1MHz. The Transmitter may be

safely operated at 100% duty cycle

for an indefinite period into a short

circuited 1553 bus.

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

Waveform. Figure 2.)

The pre-set internal thresholds will

detect data bus signals exceeding

1.150 Volts P-P and reject signals

less than 0.6 volts P-P when used

with a 1:2.5 turns ratio transformer.

(See Figure 5 for transformer data

and typical connection.)

CIRCUIT TECHNOLOGY

Figure 1. Transmitter Logic Waveforms

DATA IN

DATA IN

INHIBIT

LINE TO LINE

OUTPUT

NOTES:

1.DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.

2.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

SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700

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