Standard Products
ACT4489 Single Transceiver
for MIL-STD-1553A/B, MIL-STD-1760 & SAE-AS15531
www.aeroflex.com/Avionics
May 16, 2005
FEATURES
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Small size, light weight and low power dissipation single transceiver
Bipolar supply ±12V, logic supply +5V
Outstanding MIL-STD-1553 / SAE-AS15531 performance
Monolithic construction
Input and output TTL compatible design
Designed for commercial, industrial and aerospace applications
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
DESCRIPTION
The Aeroflex-Plainview ACT4489 is the next generation monolithic transceiver design which provides full
compliance with MIL-STD-1553A/B, MIL-STD-1760 and meets SAE-AS15531 requirements in a small package
with low power consumption. The series performs the front-end analog function of inputting and outputting data
through a transformer to the 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.
TRANSMITTER
The transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 ratio
transformer the data bus signal is typically 7.0 V
P
-
P
at Point 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 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 Figure 1
Transmitter Logic Waveform). The Transmitter may be safely operated for an indefinite period with the bus (Point
A) short circuited at 100% duty cycle.
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 Figure 2 Receiver Logic Waveform).
The pre-set internal thresholds will detect data bus signals exceeding 1.20 V
P
-
P
and reject signals less than 0.6 V
P
-
P
when used with a transformer (See Figure 5 for transformer data and typical connections).
A low level at the RX STROBE IN input inhibits the DATA and DATA outputs.
SCD4489 Rev B
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V (V
L
)
+12 V (+Vcc)
-12 V (-V
EE
)
GND1-3
CASE
RX DATA IN
RX DATA IN
TX DATA OUT
DRIVER
ACTIVE
FILTER
OUTPUT
STAGE
TX DATA OUT
REFERENCE
COMP.
RX DATA OUT
INPUT
AMPLIFIER
ACTIVE
FILTER
COMP.
RX DATA OUT
RX STROBE
BLOCK DIAGRAM (WITHOUT TRANSFORMER)
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them,
and must be in the same state during off times (both high or low).
FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
Note overlap
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED
SCD4489 Rev B
2
ABSOLUTE MAXIMUM RATINGS
Operating case temperature
Storage case temperature
Power supply voltage
V
CC
V
EE
V
L
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
Thermal resistance – Junction to case
-55°C to +125°C
-65°C to +150°C
-0.3 V
DC
to +18 V
DC
+0.3 V
DC
to -18 V
DC
-0.3 V
DC
to +7.0 V
DC
-0.3V
DC
to +5.5V
DC
±40 Vp-p
±10V
300 mA
2.5 Watts
10°C
4°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
(Note 2)
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
Parameter
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Conditions
V
IN
= 0.4V
V
IN
= 2.7V
Symbol
I
ILD
I
IHD
V
ILD
V
IHD
Min
-
-
-
2.0
Typ
-0.1
1
-
-
Max
-0.2
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 1
See Figure 5
Point B
Point C
V
IN
= 0.4V
V
IN
= 2.7V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
Z
OI
-
-
-
2
-
-
-
2K
1K
-0.1
1.0
-
-
175
90
2
-
-
-0.2
40
0.7
-
225
150
10
-
-
mA
µA
V
V
nS
nS
mV
P
-
P
Ω
Ω
OUTPUT CHARACTERISTICS
Differential output level
Rise and fall times (10% to 90% of p-p output)
Output offset. See Figure 3. 2.5 µS after midpoint
crossing of the parity bit of the last word of a 660µS
message.
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
SCD4489 Rev B
Figure 5
Point A
V
O
6
100
-
7
160
-
9
300
±90
V
P
-
P
nS
mVpeak
t
R
&
t
F
V
OS
t
DTX
3
-
100
200
nS
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
(Note 2)
Parameter
Differential Voltage Range
(See Figure 5, Point B)
Common Mode Rejection Ratio (Note 3)
"1" State – Rx Data or Rx Data Output
"0" State – Rx Data or Rx Data Output
Delay (average) from Differential Input Zero
Crossings to RX DATA and RX DATA Output 50%
points
Input Threshold Voltage (referred to the bus)
100KHz–1MHz
I
OH
= -0.4 mA
I
OI
= 4 mA
Conditions
TXFMR
1:1
Symbol
V
IDR
CMRR
V
OH
V
OL
t
DRX
Min
-
45
2.5
-
-
Typ
-
-
3.7
0.35
270
Max
40
-
-
0.5
400
Unit
V
PK
dB
V
V
nS
V
TH
0.60
0.75
1.20
V
P
-
P
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Strobe Delay (Turn-on or Turn-off)
V
S
= 0.4V
V
S
= 2.7V
I
IL
I
IH
V
IL
V
IH
-
-
-
2.0
-
-0.1
1
-
-
50
-0.2
+40
0.7
-
100
mA
µA
V
V
nS
t
SD
POWER DATA
(Note 2)
POWER SUPPLY CURRENTS – PER CHANNEL – SEE FIGURE 4
Transmitter Standby
Note 4
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
-
-
-
-
-
-
-
-
-
-
-
-
0
12
18
58
12
18
115
12
18
230
12
18
1
16
30
63
20
30
125
20
30
250
20
30
mA
25% Duty Cycle
50% Duty Cycle
100% Duty Cycle
POWER SUPPLY VOLTAGE
±12V Operating Power Supply Voltage Range
+5V Operating Power Supply Voltage Range
V
CC
V
EE
V
L
+11.40
-11.40
+4.50
+12.00 +12.60
-12.00 -12.60
+5.00
+5.50
V
V
V
Notes:
1. Power on or off, measured from 75KHz to 1MHz at point A and transformer self impedance of 3KΩ minimum at 1MHz.
2. Power Supplies: +12V
DC
±0.60V & +5V
DC
±0.5V, bypassed by 10 µF (Tantalum recommended) Capacitor minimum. All measurements
& specifications apply over the temperature range of -55°C to +125°C (Case temperature) unless otherwise specified.
3. When measured as shown per Figure 5 with ± 10V
PK
, line to ground, DC to 2MHz
4. Typical power is measured with V
BUS
at point A = 7.0V
P
-
P
SCD4489 Rev B
4
LAST BIT
Magnified View
OUTPUT OFFSET
*
*
0 Volts
OUTPUT OFFSET
Transformer Coupled Stub
2.5 µsec
70Ω
ACT4489D
1:0.707
7
3
2
C
1:1.4 52.5Ω
*
Offset measured at Point A in Figure 5
TX DATA OUT
A
FIGURE 3 – TRANSMITTER (TX) OUTPUT
OFFSET
TX DATA OUT
RX DATA IN
RX DATA IN
1
5
T1553-1
Zoi
V
CM
52.5Ω
Direct Coupled Stub
ACT4489D
3600
3200
3.0W
POWER DISSIPATION
MILLIWATTS
2800
2400
2000
1600
1200
800
400
0
0
10
20
30
40
50
60
Typical Hybrid
Dissipation
Transformer Model use Technitrol Part# 1553-1
or equivalent
RX DATA IN
Typical Hybrid Input Power
1.9W
TX DATA OUT
RX DATA IN
TX DATA OUT
1:1
3
8
2
B
55Ω
A
4
1
T1553-1
Zoi
55Ω
70Ω
0.270W
70
80
90 100
DUTY CYCLE – PERCENT
Note: Vcc = +12V
DC
, V
EE
= -12V
DC
, V
L
= +5V
DC
, Transformer ratio 1:1,
V
BUS
(Point A) at 7.0V
P
-
P
.
FIGURE 5 – TYPICAL 1553 BUS
CONNECTIONS
FIGURE 4 – POWER DISSIPATION VS.
DUTY CYCLE
SCD4489 Rev B
5
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