CIRCUIT TECHNOLOGY
www.aeroflex.com
eroflex Circuit T
echnology
Data Bus Modules For The Future SCD4419D REV G 5/10/00
Features
World's smallest and lowest standby power dual variable
amplitude transceiver 0.3" x 1.2" packages
Lowest standby power
Dual transceiver meets military data bus requirements,
MIL-STD-1553
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 300 KRADS total dose
DESC SMD pending
+5V Control line
General Description
The Aeroflex Circuit Technology
model ACT4419D is a next
generation D.I. monolithic
transceiver which provides
variable amplitude in full
compliance with MIL-STD-1553
data bus requirements with the
lowest standby power
consumption available 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, isolated
on the data bus side with two 52.5
Ohm fault isolation resistors, and
loaded by two 70 Ohm
terminations plus additional
Block Diagram (without Transformer, Channel A shown)
SHAPING
OUTPUT
STAGE
COMP.
COMP.
REFERENCE
ACTIVE
FILTER
DRIVER
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
STROBE
TX/RX
TX/RX
RX DATA OUT
RX DATA OUT
GROUND
V
CONT
Channel B
INPUT
AMP
Channel A
Channel B
for MIL-STD-1553
Dual Variable Amplitude Transceivers
ACT4419D Dual Transceivers
ACT4419D
CIRCUIT TECHNOLOGY
Aeroflex Circuit Technology
SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
2
receivers, 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).
Note: Receiver outputs are
normally low.
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).
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
Figure 2 - Receiver Logic Waveforms
Note overlap
LINE TO LINE
INPUT
DATA OUT
DATA OUT
Aeroflex Circuit Technology
SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
3
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
(Note: Normal operation conditions require one
transmitter on and the other off at any given time.
Maximum Junction To Case Temperature Rise for the Hottest Device
10C
Thermal Resistance, Junction to Bottom of Case
5C/W
Electrical Characteristics Driver Section
1/ 3/
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
ILD
-
-
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,(0
1) to inhibited output
-
t
DXOFF
-
200
300
nS
Delay from TX inhibit, (1
0) to active output
-
t
DXON
-
100
180
nS
Differential Output Noise, inhibit mode
-
V
NOI
-
2
10
mVp-p
Differential Output Impedance 2/
-
Z
OI
2K
-
-
Output Characteristics
Differential output level (direct coupled stub)
Pt. A - A'
V
O
6.6
7.1
7.6
V p-p
Differential output level (transformer coupled)
Pt. B - B'
V
O
18.7
20.1
21.5
V p-p
Rise and Fall times
-
t
R
& t
F
100
170
300
nS
Output Offset 4/
Pt. A - A'
V
OS
-
-
90
mV peak
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
-
t
DTX
-
120
180
nS
Output Voltage Delta, Pt. A - A' 5/
-
V
O
D
0
71
142
mVp-p
Output Voltage Delta, Pt. B - B' 5/
-
V
O
S
0
200
400
mVp-p
Control Line Input Resistance
-
R
CONT
-
5
-
K
Aeroflex Circuit Technology
SCD4419D REV F 2/10/00 Plainview NY (516) 694-6700
4
Notes: 1. V
CC
= 5 Volts 0.1 V, T
C
= -55C to +125C, 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 +25C.
4. At point A-A' on Figure 5, 2.5 S after midpoint crossing of the parity bit of the last word of a 660 S message.
5. Output Voltage Delta (V
O
)
= V
O
(
IDEAL
) - V
O
(
MEASURED
), where V
O
(
IDEAL
) = Slope x V
CONT
and
Slope =
V
O
V
CONT
, See Figure 3.
Electrical Characteristics Receiver Section
1/
3/
Parameter
Condition
Symbol
Min
Typ
Max
Unit
Differential Voltage Range
Pt. A - A'
V
IDR
-
20
V peak
Common Mode Rejection Ratio
-
CMRR
45
-
-
dB
Strobe Characteristics (Logic "0" inhibits output)
(NOTE: I
f not used, a 1K pullup to 5V 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
)
-
90
150
nS
Strobe Delay (turn-off)
-
t
SD
(
OFF
)
-
90
150
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
3.5
-
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
-
320
400
nS
Power Data
1/ 3/
Maximum Current per Channel (other channel in standby)
Duty Cycle
Typ
Max
Transmitter Standby
50 mA
65 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 Range
+V
4.75 to 5.5 Volts
Aeroflex Circuit Technology
SCD4419D REV G 5/10/00 Plainview NY (516) 694-6700
5
Configurations and Ordering Information
Model No.
DESC No.
Receiver Data level
Case
Specs.
Configuration
ACT4419-D *
Pending
Normally Low
DIP
1553
Dual
ACT4419-DF *
Pending
Normally Low
Flat Package
1553
Dual
* For 10V Control voltage consult factory.
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 Figure 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
Magnified View
D.U.T
P'
P
Z
O
Use Technitrol 1553-45 or Equivalent
Transformer:
V
CONT
= 0 5Vdc
(Total hybrid with one channel transmitting
and the other in standby)
0.4FS
0.8FS
0.6FS
0.2FS
V
O
PK
-
PK
@ AA'
FS
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 7.1 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
Typical
Maximum
Figure 3 Transmitter Output Amplitude (V
O
)
vs V
CONT
Voltage
0 1 2 3 4 5
CONTROL VOLTAGE
O
U
T
P
U
T
A
M
P
L
I
T
U
D
E
2.84
7.1
5.68
4.26
1.42
0
V
CONT
dc
Slope =
V
O
V
CONT
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