Standard Products
ACT4419D Dual Variable Amplitude Transceiver
for MIL-STD-1553
April 16, 2007
FEATURES
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Dual transceiver meets military data bus requirements – MIL-STD-1553
Low standby power
Low power dissipation at full output power
Single +5V power supply
+5V Control line
Current source output
0.3" x 1.2", ceramic, 18 lead DIP or flat package
Designed for commercial, industrial and aerospace applications
Processed and screened to MIL-STD-883
specifications
Aeroflex is a Class H & K MIL-PRF-38534
Manufacturer
DESC SMD pending
GENERAL DESCRIPTION
The Aeroflex Plainview model ACT4419D is a monolithic transceiver which provides variable amplitude in full
compliance with MIL-STD-1553 data bus requirements with low standby power consumption and one power supply
operation.
The dual channel model ACT4419D performs the front-end analog function of inputting and outputting data through a
transformer to a MIL-STD-1553 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 – 5 Vdc control line at 1 mA maximum input current at 5 Volts.
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 the data bus signal produced is 7.1 Volts nominal P-P at A-A’ (See Figure 5). When both
DATA and DATA inputs are held low, the transmitter output becomes 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 transformer data and typical connection, Figure 5).
A low level at the Strobe input inhibits the DATA and DATA outputs.
SCD4419D Rev J
Channel B
TX/RX
TX DATA IN
TX DATA IN
DRIVER
TRANSMIT
ACTIVE
FILTER
OUTPUT
STAGE
TX/RX
V
CONT
TX INHIBIT
+5 V
GROUND
Channel A
Channel B
REFERENCE
COMP.
RX DATA OUT
INPUT
AMP
RECEIVE
ACTIVE
FILTER
COMP.
RX DATA OUT
STROBE
BLOCK DIAGRAM (WITHOUT TRANSFORMER, CHANNEL A SHOWN)
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 low).
FIGURE 1 - TRANSMITTER LOGIC WAVEFORMS
LINE TO LINE
INPUT
DATA OUT
DATA OUT
Note overlap
FIGURE 2 - RECEIVER LOGIC WAVEFORMS
SCD4419D Rev J 4/16/07
Aeroflex Plainview
2
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
Thermal Resistance – Junction to Case
-55°C to +125°C
-65°C to +150°C
+5.0 V to +7.0 V
±10 V
±5 V
650 mA
(Note: Normal operation conditions require one
transmitter on and the other off at any given time)
2 Watt
10°C
5°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
1/ 3/
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
Parameter
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Condition
V
IN
= 0.4 V
V
IN
= 2.7 V
-
-
Symbol
I
ILD
I
IHD
V
ILD
V
IHD
Min
-
-
-
2.0
Typ
-0.2
1
-
-
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 *
2/
*
See Aeroflex Application note# 113 for reference.
V
IN
= 0.4V
V
IN
= 2.7V
-
-
-
-
-
-
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
-
-
-
2
-
-
-
2K
-0.2
1.0
-
-
200
100
2
-
-0.4
40
0.7
-
300
180
10
-
mA
µA
V
V
nS
nS
mVp-p
Ω
OUTPUT CHARACTERISTICS
Differential output level (direct coupled stub)
Differential output level (transformer coupled)
Rise and Fall times
Output Offset 4/
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
Output Voltage Delta, Pt. A - A’
Output Voltage Delta, Pt. B - B’
Control Line Input Resistance
SCD4419D Rev J 4/16/07
Pt. A - A’
Pt. B - B’
-
Pt. A - A’
-
-
-
-
V
O
V
O
t
R
& t
F
V
OS
t
DTX
V
O
Δ
D
V
O
Δ
S
R
CONT
6.6
18.7
100
-
-
0
0
-
7.1
20.1
170
-
120
±71
±200
5
7.6
21.5
300
±90
180
±142
±400
-
V p-p
V p-p
nS
mV peak
nS
mVp-p
mVp-p
K
Ω
5/
5/
Aeroflex Plainview
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
1/ 3/
Parameter
Differential Voltage Range
Common Mode Rejection Ratio
Condition
Point A - A’
-
Symbol
V
IDR
CMRR
Min
-
45
-
Typ
Max
20
-
Unit
V peak
dB
STROBE CHARACTERISTICS (Logic "0" Inhibits Output)
"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
-
-
-0.2
1
-
-
90
90
-0.4
+40
0.7
-
150
150
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
-
-
3.5
0.3
320
-
0.5
400
V
V
nS
POWER DATA
1/ 3/
MAXIMUM CURRENT PER CHANNEL (Other channel in standby)
Duty Cycle
Transmitter Standby
25% duty cycle
50% duty cycle
100% duty cycle
Typ
50 mAt
155 mA
290 mA
560 mA
Max
65 mA
185 mA
335 mA
650 mA
+V
4.75 to 5.5 Volts
Notes: 1. V
CC
= 5 Volts ±0.1 V, T
C
= -55°C to +125°C, unless otherwise specified.
2. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A’. See Figure 5.
3. All typical values are measured at +25°C.
4. At point A-A’ on Figure 5, 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message.
5. Output Voltage Delta (ΔV
O
)
= V
O
(
IDEAL
) - V
O
(
MEASURED
), where V
O
(
IDEAL
) = Slope x V
CONT
and Slope =
ΔV
O
÷
ΔV
CONT
, See Figure 3.
SCD4419D Rev J 4/16/07
Aeroflex Plainview
4
V
O PK
-
PK
@ A–A'
7.1
FS
LAST BIT
5.68
OUTPUT AMPLITUDE
Slope =
Δ
V
O
÷
Δ
V
CONT
0.8FS
Magnified View
OUTPUT OFFSET
*
4.26
0.6FS
OUTPUT OFFSET
*
2.84
0.4FS
2.5 µsec
1.42
0.2FS
0
0
V
CONT
dc
1
2
3
4
5
CONTROL VOLTAGE
*Offset measured at point A-A’ in Figure 5
FIGURE 3 – TRANSMITTER OUTPUT AMPLITUDE (Vo)
vs. V
CONT
VOLTAGE
FIGURE 4 – TRANSMITTER (TX)
OUTPUT OFFSET
70Ω
70Ω
Z
O
POWER DISSIPATION
MILLIWATTS
1600
1400
1200
1000
800
Typical
600
400
200
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’
V
CONT
= 0 – 5Vdc
0
0
10
20
30
40
50
60
70
80
90 100
Transformer:
Use Technitrol 1553-45 or Equivalent
DUTY CYCLE – PERCENT
Note: Vcc = 5 Volts, V
bus
(Pt. A-A') at 7.1 Volts P-P
FIGURE 5 – TYPICAL TRANSFORMER
CONNECTION
FIGURE 6 – POWER DISSIPATION vs. DUTY CYCLE
(Total hybrid with one channel
transmitting and the other in standby)
SCD4419D Rev J 4/16/07
Aeroflex Plainview
5
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