CIRCUIT TECHNOLOGY
www.aeroflex.com
eroflex Circuit T
echnology
Data Bus Modules For The Future SCD4419 REV B 10/21/99
Features
First fully monolithic 5V only Variable Amplitude
Transceiver
Lowest standby power
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 output
Monolithic construction using dielectrically isolated(D.I.)
Processed and screened to MIL-STD-883 specs
Radiation Hard to 2.5 MRADS Total Dose
DESC SMD pending
Either 5V or 10V DC control line (Factory Set)
General Description
The Aeroflex Circuit Technology
model ACT4419 is a next generation
D.I. monolithic transceiver which
provides variable amplitude in full
compliance with MIL-STD-1553/1760
data bus requirements with the lowest
standby power consumption available
and one power supply operation.
The model ACT4419 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553/1760
data bus.
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.
Variable amplitude is adjusted with
factory preset 0 - 10 Vdc or 0 - 5 Vdc
control line at 1mA maximum input
current.
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
primary grounded center tap
1:2.5
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 7.5Volts nominal 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
Block Diagram
ACT4419FP & ACT4419 Plug In Transceivers
SHAPING
OUTPUT
STAGE
COMP.
COMP.
REFERENCE
ACTIVE
FILTER
INPUT
AMP
DRIVER
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
STROBE
TX/RX
TX/RX
RX DATA OUT
RX DATA OUT
GROUND
for MIL-STD-1553
Single Supply Variable Amplitude Transceivers
ACT4419
Preliminary
Aeroflex Circuit Technology
2
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
CIRCUIT TECHNOLOGY
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 1 - Transmitter Logic Waveforms
Figure 2 - Receiver Logic Waveforms
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.
LINE TO LINE
INPUT
DATA OUT
DATA OUT
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).
Aeroflex Circuit Technology
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Operating Case Temperature
-55C to +125C
Storage Case Temperature
-65C to +150C
Positive Power Supply Voltage
+5.0 V to +7.0 V
Receiver Differential Input
10 V
Receiver Input Voltage (Common Mode)
5 V
Driver Peak Output Current
650 mA
Total Package Power Dissipation over the Full Operating Case
Temperature Rise
2 Watt
Maximum Junction To Case Temperature Rise for the Hottest
Device
10C
Thermal Resistance, Junction to Bottom of Case
5C/W
Electrical Characteristics Driver Section
Input Characteristics, TX DATA in or TX DATA in
Parameter
Condition
Symbol
Min
Typ
Max
Unit
"0" Input Current
V
IN
= 0.4 V
I
ILD
-0.2
-0.4
mA
"1" Input Current
V
IN
= 2.7 V
I
IHD
1
40
A
"0" Input Voltage
V
IHD
0.7
V
"1" Input Voltage
V
IHD
2.0
V
Inhibit Characteristics
"0" Input Current
V
IN
=0.4V
I
ILI
-0.2
-0.4
mA
"1" Input Current
V
IN
=2.7V
I
IHI
1.0
40
A
"0" Input Voltage
V
ILI
0.7
V
"1" Input Voltage
V
IHI
2
V
Delay from TX inhibit,(01) to inhibited out-
put
t
DXOFF
200
300
nS
Delay from TX inhibit, (10) to active output
t
DXON
80
150
nS
Differential Output Noise, inhibit mode
V
NOI
2
10
mVp-p
Differential Output Impedance (inhibited)
Note 1
Z
OI
2K
Output Characteristics
Differential output level
Pt. A - A'
V
O
6
7.5
8
V p-p
Rise And Fall Times(10% to 90% of p-p out-
put)
t
r
100
170
300
nS
Output Offset at point A-A'on Fig 5., 2.5 S
after midpoint crossing of the parity bit of the
last word of a 660 S message
R
L
=35
V
OS
90
mV peak
Delay from 50% point of TX DATA or TX
DATA input to zero crossing of differential
signal
t
DTX
100
150
nS
Control Voltage Slope
0 5 Vdc measured at Pt A - A'
0 10 Vdc measured at Pt A - A'
I
L
= 1 mA
max
1.1
0.55
1.5
0.75
1.9
0.95
Vp-p/Vdc
Vp-p/Vdc
Aeroflex Circuit Technology
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Notes: 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5
2. V
cc
= 5 volts 0.1 V, for all measurements unless otherwise specified.
3. Specifications apply over the case temperature range of -55C to +125C unless otherwise specfied.
4. All typical values are measured at +25C
Electrical Characteristics Receiver Section
Parameter
Condition
Symbol
Min
Typ
Max
Unit
Differential Voltage Range, Figure 4 Point P-P'
V
IDR
20
V peak
Common Mode Rejection Ratio
CMRR
45
dB
Strobe Characteristics (Logic "0" inhibits output)
if not used, a 1K pullup to 5 V is recommended
"0" Input Current
V
S
=0.4 V
I
IL
-0.2
-0.4
mA
"1" Input Current
V
S
=2.7V
I
IH
1
+40
A
"0" Input Voltage
V
IL
0.7
V
"1" Input Voltage
V
IH
2.0
V
Strobe Delay (turn-on)
t
SD(ON)
40
100
nS
Strobe Delay (turn-off)
t
SD(OFF)
60
100
nS
Threshold Characteristics (Sinewave input )
Input Threshold Voltage(referred to the bus)
100KHz-
1MHz
V
TH
0.60
0.8
1.15
Vp-p
Output Characteristics, RX DATA and RX DATA
"1" State
I
OH
=-0.4 mA
V
OH
2.5
3.7
V
"0" State
I
OL
= 4 mA
V
OL
0.3
0.5
V
Delay, (average)from differential input zero
crossings to RX DATA and RX DATA output
50% points
t
DRX
250
400
nS
Power Data
Maximum Currents, Per Channel (+5V)
Duty Cycle
Typ
Max
Transmitter Standby
20 mA
30 mA
25% duty cycle
155 mA
185 mA
50% duty cycle
290 mA
335 mA
100% duty cycle
560 mA
650 mA
Power Supply Voltage
+V
4.75 to 5.5 Volts
Aeroflex Circuit Technology
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SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Figure 4 Transmitter (TX) Output Offset
Figure 5 Typical Transformer Connection
OUTPUT OFFSET
*
OUTPUT OFFSET
*
LAST BIT
2.5 sec
*Offset measured at point A-A' in Fig 5
1:2.5
A
A'
B'
B
TX DATA OUT
TX DATA OUT
RX DATA IN
RX DATA IN
70
70
55
55
Center
Tap
1:1.77 for
stub
coupling
0 volts
Magnified View
D.U.T
P'
P
Figure 6 Power Dissipation vs. Duty Cycle
P
O
W
E
R
D
I
S
S
I
P
A
T
I
O
N
M
I
L
L
I
W
A
T
T
S
Note: Vcc = 5 Volts, V
bus
(pt A-A') at 7.5 Volts P-P
0 10 20 30 40 50 60 70 80 90 100
1600
1400
1200
1000
800
600
400
200
0
DUTY CYCLE PERCENT
Z
O
Typical
Maximum
Figure 3 Transmitter (TX) Output Amplitude
vs Control Voltage
0 1 2 3 4 5 6 7 8 9 10
CONTROL VOLTAGE
O
U
T
P
U
T
A
M
P
L
I
T
U
D
E
3
3.75
6.75
7.5
6
5.25
4.5
2.25
1.5
.75
0
V
P
-
P
@ BB'
Vdc
Typical
Slope = 0.75 V
P
-
P
/Vdc for 10V
Slope = 1.5 V
P
-
P
/Vdc for 5V
6
7.5
4.5
3
1.5
Use Technitrol 1553-45 or Equivalent
Transformer
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