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PDF ACT4418D Data sheet ( Hoja de datos )
| Número de pieza | ACT4418D | |
| Descripción | ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818/ A5690/ A5232/ A4905 & MIL-STD-1553 | |
| Fabricantes | Aeroflex Circuit Technology | |
| Logotipo |  |
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ACT4418 Molded Dual Variable Amplitude Transceivers
for MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553
Features
• ACT4418 Dual Transceivers meets
MIL-STD-1553A&B, Macair A3818,
A4905, A5232 and A5690 Specs
• ±12 Volt Power Supply Operation
• Voltage source output for higher bus
drive power
• Molded Plug-in package
• Monolithic construction using linear
ASICs
• Variable TX Amplitude
• Processed and Screened to Mil-STD-883
Specs for Industrial temperature range
TX DATA IN
TX DATA IN
TX INHIBIT
+5V
-12V
GROUND
RX DATA IN
RX DATA IN
+12V
STROBE
DRIVER
INPUT
AMP
One Channel
SHAPING
OUTPUT
STAGE
V+
V-
ACTIVE
FILTER
COMP.
COMP.
TX DATA OUT
TX DATA OUT
AMP CONTROL
RX DATA OUT
RX DATA OUT
Block Diagram (without Transformer)
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
General Description
The Aeroflex Circuit Technology
ACT4418D is a new generation
monolithic transceivers which provide
full compliance with Macair and MIL-
STD-1553 data bus requirements
while providing variable amplitude
control.
The ACT4418D performs the front-
end analog function of inputting and
outputting data through a transformer
to a MIL-STD-1553 or Macair data
bus. The ACT4418D can be consid-
ered a "Universal" Transceiver in that
it is compatible with MIL-STD-1553A,
B, Macair A-3818, A-4905, A-5232
and A-5690.
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 ACT4418D
active filter design has additional high
frequency roll-off to provide the
required Macair low harmonic
distortion waveform without
increasing the pulse delay
characteristics significantly.
Efficient transmitter electrical and
thermal design provides low internal
power dissipation and heat rise at
high and well as low duty cycles.
Variable amplitude is adjusted with
0–10 Vdc on the control pin.
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 iso-
lation resistors, and loaded by two 70
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4418D REV A 9/24/97
1 page  
Figure 3 Transmitter (TX) Output Amplitude
vs Control Voltage
Figure 4 Transmitter (TX) Output offset
VP-P @ B–B'
30
27
24
21
18 Typical
15
12
9
Slope = 3VP-P/Vdc
6
3
0
01 234567 89
CONTROL VOLTAGE
0 Volts
10 Vdc
LAST BIT
Magnified View
*OUTPUT OFFSET
*OUTPUT OFFSET
2.5 µsec
*Offset measured at point A-A’ in Fig 5
Figure 5 Typical Transformer Connection
(Total hybrid with one channel transmitting
and the other not powered – 100% Duty Cycle)
70Ω 70Ω
TX DATA OUT
TX DATA OUT
RX DATA IN
RX DATA IN
C1 N1:N2 52.5Ω
BA
Ctr
tap
C2 B’ A’
N1:N3 for
stub
coupling
52.5Ω
C1 & C2 are > 0.47µF,
BX Ceramic Capacitors.
Transformer turns ratios:
N1:N2 = 1:1
N1:N3 = 1:0.707
Use Aeroflex 25T1553-1
Figure 6 Typical Hybrid Power Dissipation
vs Duty Cycle (Total with one channel
transmitting and the other not powered)
4.0
3.5
3.0 Total Hybrid Input
Power
2.5
3.25
2.0
1.5 1.65
1.0
Typical Hybrid
0.5 Dissipation
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE, PERCENT
For VOP-P = 30 V at 140Ω
NOTES
1. Characteristics guaranteed by design, not production tested.
2. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ
minimum at 1 MHz.
3. Specifications apply over the temperature range of -40°C to +85°C (Case Temperature) unless otherwise
noted.
4. All typical values are measured at +25°C.
Aeroflex Circuit Technology
5 SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet ACT4418D.PDF ] | |
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