ACT4077 Driver for
MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553
CIRCUIT TECHNOLOGY
www.aeroflex.com
Features
• ACT4077 Driver meets MIL-STD-1553A & B, Macair A3818, A4905,
A5232 and A5690 specs
• Bipolar Supply ±15V to ±12V, Logic Supply +5V
• Direct replacement for CT2077 and CT3077
• Voltage source output for higher bus drive power
• Plug-in, flat package or low profile flat package
• Monolithic construction using linear ASICs
• Processed and screened to MIL-STD-883 specs
• MIL-PRF-38534 Compliant Devices Available
X
LE
F 7
O 7 9
R 0 7
E 4 3
A CT 88
A A-
S
U
X
LE P
F F
O 77 9
R 0 7
E 4 3
A CT 88
A A-
S
U
ACT4077 Driver
TX DATA IN
TX DATA IN
DRIVER
SHAPING
OUTPUT
STAGE
TX DATA OUT
TX DATA OUT
TX INHIBIT
Block Diagram (without Transformer)
EROFLEX CIRCUIT TECHNOLOGY - Data Bus Modules for the Future ©SCD4077 REV A 3/25/03
General Description
The Aeroflex Laboratories driver ACT4077
are new generation monolithic Drivers which
provide full compliance with Macair and
MIL-STD-1553 data bus requirements
The ACT4077 performs the front-end analog
function of inputting and outputting data
through a transformer to a MIL-STD-1553 or
Macair data bus. The ACT4077 can be
considered a "Universal" Driver in that it is
compatible with MIL-STD-1553A, B, Macair
A-3818, A-4905, A-5232 and A-5690.
Design of the Driver 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 ACT4077 series
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 Driver electrical and thermal design
provides low internal power dissipation and
heat rise at high and well as low duty cycles.
The Driver 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 4.) When both DATA and
DATA inputs are held low or high, the Driver
output becomes a high impedance and is
“removed” from the line. In addition, an
overriding “INHIBIT" input provides for the
removal of the Driver output from the line. A
logic “1” applied to the “INHIBIT” takes priority
over the condition of the data inputs and
disables the Driver. (See Driver Logic
Waveforms, Figure 1)
The Driver utilizes an active filter to suppress
harmonics above 1 MHz to meet Macair
specifications A-3818, A-4905, A-5232 and
A-5690. The Driver may be safely operated for
an indefinite period at 100% duty cycle into a
data bus short circuit.
Figure 1 - Driver 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).
Aeroflex Circuit Technology
2
SCD4077 REV A 3/25/03 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Operating case temperature
Storage Case Temperature
Power Supply Voltages
Logic Input Voltage
Receiver Differential Input
Receiver Input Voltage (Common Mode)
Driver Peak Output Current
Total Package Power Dissipation over the Full
Operating Case Temperature Range
Maximum Junction to Case Temperature
Junction-Case, Thermal Resistance
±16 V
-0.3 V to +5.5 V
±40 V
±10V
300 mA
3.6 Watts
18°C
5°C/W
-55°C to +125°C
-65°C to +150°C
+7 V
Electrical Characteristics, Driver Section
Input Characteristics, TX DATA IN or TX DATA IN
Parameter
Condition
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
V
IN
= 0.4 V
V
IN
= 2.7 V
Symbol
I
ILD
I
IHD
V
IHD
V
IHD
Min
-
-
-
2.0
Typ
-0.2
1.0
-
-
Max
-0.4
40
0.7
-
Unit
mA
µA
V
V
Inhibit Characteristics
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit(0
→
1) to inhibited output
Delay from TX inhibit, (1
→
0) to active output
Differential output noise, inhibit mode
Differential output impedance (inhibited)
Note 2
Note 1
Note 1
V
IN
= 0.4 V
V
IN
= 2.7 V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
-
-
-
2
-
-
-
2K
-0.2
1.0
-
-
300
300
0.8
-
-0.4
40
0.7
-
450
450
10
-
mA
µA
V
V
nS
nS
mVp-p
Ω
Output Characteristics
Differential output level
Rise and fall times
(10% to 90% of p-p output)
Output offset at point A-A’ on Fig 5., 2.5 µS
after midpoint crossing of the parity bit of the
last word of a 660 µS message
Delay from 50% point of TX DATA or
TX DATA input to zero crossing of
differential signal. (Note 1)
Aeroflex Circuit Technology
R
L
= 35
Ω
V
O
t
R
& t
F
7
200
7.5
250
9
300
Vp-p
nS
R
L
= 35
Ω
V
OS
±90
mVpeak
t
DTX
240
300
nS
3
SCD4077 REV A 3/25/03 Plainview NY (516) 694-6700
Power Supply Currents (Power Supplies set at +15V, -15V, +5V)
Parameter
Driver Standby
Power Data
Condition
Symbol
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
Min
Typ
15
27
13
34
50
14
50
70
14
110
120
13
Max
30
50
20
50
80
20
80
100
20
140
150
20
Unit
25% duty cycle
mA
50% duty cycle
100% duty cycle
Recommended Power Supply Voltage Range
+V
-V
Logic
+11.4 Volts to +15.75 Volts
-11.4 Volts to -15.75 Volts
+4.5 Volts to +5.5 Volts
Aeroflex Circuit Technology
4
SCD4077 REV A 3/25/03 Plainview NY (516) 694-6700
Figure 2 - Driver (TX) Output Wave form
Figure 3 - Driver (TX) Output offset
Last Bit
t
f
*
90%
Magnified View
OUTPUT OFFSET*
6.5V P-P MIN
8.5V P-P MAX
0 Volts
0 Volts
OUTPUT OFFSET*
10%
2.5 µsec
t
r
*
* Rise and fall times measured at point A-A’ in Fig 5
*Offset measured at point A-A’ in Fig 5
Figure 4 - Typical Transformer connection
70Ω
70Ω
Figure 5 - Power Dissipation vs. Duty Cycle
4.0
N1:N2
B
Ctr
tap
B’
TX DATA OUT
52.5Ω
A’
52.5Ω
A
N1:N3 for
stub
coupling
POWER DISSIPATION
WATTS
3.5
3.0
2.5
(TYPICAL)
2.0
1.5
1.0
0.5
Transformer turns ratios:
N1:N2 = 1:1
N1:N3 = 1:0.71
Use Aeroflex 25T1553-1
0
0
10
20
30
40
50
60
70
80
90 100
TX DATA OUT
DUTY CYCLE, PERCENT
Notes:
1. Characteristics guaranteed by design, not production tested.
2. Measured from 75KHz to 1MHz at point A-A’, power on or off.
3. Specifications apply over the temperature range of -55°C to +125°C (case temperature)
unless otherwise noted.
4. All typical values are measured at +25°C
The information contained in this data sheet is believed to be accurate; however, Aeroflex Circuit
Technology. assumes no responsibility for its use, and no licence or rights are granted by
implication or otherwise in connection therewith.
Aeroflex Circuit Technology
5
SCD4077 REV A 3/25/03 Plainview NY (516) 694-6700
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