ACT4419
Single Supply Variable Amplitude Transceivers
for MIL-STD-1553
Features
Preliminary
CIRCUIT TECHNOLOGY
www.aeroflex.com
• 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.
ACT4419FP & ACT4419 Plug In Transceivers
Transmitter
TX/RX
TX DATA IN
TX DATA IN
DRIVER
SHAPING
OUTPUT
STAGE
TX/RX
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
TX INHIBIT
RX DATA OUT
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
+5 V
REFERENCE
COMP.
GROUND
INPUT
AMP
ACTIVE
FILTER
COMP.
RX DATA OUT
STROBE
Block Diagram
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCD4419 REV B 10/21/99
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
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Operating Case Temperature
Storage Case Temperature
Positive Power Supply Voltage
Receiver Differential Input
Receiver Input Voltage (Common Mode)
Driver Peak Output Current
Total Package Power Dissipation over the Full Operating Case
Temperature Rise
Maximum Junction To Case Temperature Rise for the Hottest
Device
Thermal Resistance, Junction to Bottom of Case
-55°C to +125°C
-65°C to +150°C
+5.0 V to +7.0 V
±10 V
±5 V
650 mA
2 Watt
10°C
5°C/W
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
Typ
-0.2
1
Max
-0.4
40
0.7
Unit
mA
µA
V
V
2.0
Inhibit Characteristics
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit,(0¡1) to inhibited out-
put
Delay from TX inhibit, (1¡0) to active output
Differential Output Noise, inhibit mode
Differential Output Impedance (inhibited)
Note 1
V
IN
=0.4V
V
IN
=2.7V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
2K
2
200
80
2
300
150
10
-0.2
1.0
-0.4
40
0.7
mA
µA
V
V
nS
nS
mVp-p
Ω
Output Characteristics
Differential output level
Rise And Fall Times(10% to 90% of p-p out-
put)
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
Control Voltage Slope
0 – 5 Vdc measured at Pt A - A’
0 – 10 Vdc measured at Pt A - A’
Aeroflex Circuit Technology
Pt. A - A’
V
O
t
r
V
OS
6
100
7.5
170
8
300
V p-p
nS
R
L
=35
Ω
±90
mV peak
t
DTX
100
150
nS
I
L
= 1 mA
max
3
1.1
0.55
1.5
0.75
1.9
0.95
Vp-p/Vdc
Vp-p/Vdc
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Electrical Characteristics – Receiver Section
Parameter
Differential Voltage Range, Figure 4 Point P-P’
Common Mode Rejection Ratio
Condition
Symbol
V
IDR
CMRR
Min
Typ
Max
20
Unit
V peak
dB
45
Strobe Characteristics (Logic "0" inhibits output)
if not used, a 1K pullup to 5 V is recommended
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Strobe Delay (turn-on)
Strobe Delay (turn-off)
V
S
=0.4 V
V
S
=2.7V
I
IL
I
IH
V
IL
V
IH
t
SD(ON)
t
SD(OFF)
2.0
40
60
100
100
-0.2
1
-0.4
+40
0.7
mA
µA
V
V
nS
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
"0" State
Delay, (average)from differential input zero
crossings to RX DATA and RX DATA output
50% points
I
OH
=-0.4 mA
I
OL
= 4 mA
V
OH
V
OL
t
DRX
2.5
3.7
0.3
250
0.5
400
V
V
nS
Power Data
Maximum Currents, Per Channel (+5V)
Duty Cycle
Transmitter Standby
25% duty cycle
50% duty cycle
100% duty cycle
Typ
20 mA
155 mA
290 mA
560 mA
Max
30 mA
185 mA
335 mA
650 mA
Power Supply Voltage
+V
4.75 to 5.5 Volts
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 -55°C to +125°C unless otherwise specfied.
4. All typical values are measured at +25°C
Aeroflex Circuit Technology
4
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
Figure 3 – Transmitter (TX) Output Amplitude
vs Control Voltage
V
P
-
P
@ B–B'
7.5
6.75
6
OUTPUT AMPLITUDE
5.25
4.5
Typical
3.75
3
2.25
1.5
.75
0
0
1
2
3
4
5
6
7
8
9
7.5
6
4.5
3
1.5
Vdc
10
0 volts
Slope = 0.75 V
P
-
P
/Vdc for 10V
Slope = 1.5 V
P
-
P
/Vdc for 5V
Figure 4 – Transmitter (TX) Output Offset
LAST BIT
Magnified View
OUTPUT OFFSET
*
OUTPUT OFFSET
*
2.5 µsec
*Offset measured at point A-A’ in Fig 5
CONTROL VOLTAGE
Figure 5 – Typical Transformer Connection
70Ω
70Ω
Z
O
Figure 6 – Power Dissipation vs. Duty Cycle
1600
POWER DISSIPATION
MILLIWATTS
1400
1200
1000
800
Typical
600
400
200
0
0
10
20
30
40
50
60
70
80
90 100
Maximum
TX DATA OUT
D.U.T
1:2.5
P
B
55Ω
A
Center
Tap
1:1.77 for
stub
coupling
TX DATA OUT
RX DATA IN
RX DATA IN
P’
B’
55Ω
A’
DUTY CYCLE – PERCENT
Transformer
Use Technitrol 1553-45 or Equivalent
Note: Vcc = 5 Volts, V
bus
(pt A-A') at 7.5 Volts P-P
Aeroflex Circuit Technology
5
SCD4419 REV B 10/21/99 Plainview NY (516) 694-6700
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