ACT4468-D (2/05)

Standard Products
ACT4468D Dual Transceivers
for MIL-STD-1553, MIL-STD-1760 & SAE-AS15531
www.aeroflex.com/Avionics
February 18, 2005
FEATURES
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Small size, light weight and low power dissipation dual transceiver
Single +5V DC power supply operation
Outstanding MIL-STD-1553 / MIL-STD-1760 / SAE-AS15531 performance
Monolithic construction
Current source output
Designed for commercial, industrial and aerospace applications
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
GENERAL DESCRIPTION
The Aeroflex-Plainview ACT4468D is the next generation monolithic transceiver design which provides full
compliance with MIL-STD-1553/1760 and meets SAE-AS15531 requirements in the smallest packages with the
lowest standby power consumption and one power supply operation.
The dual channel Model ACT4468D perform 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. Each channel
of the dual transceiver is completely separate from the other and fully independent. This includes power leads as well
as signal lines. Hence, each channel may be connected to a different data bus with no interaction.
TRANSMITTER
The transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 ratio
transformer the data bus signal is typically 7.5 Volts P-P at Point 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 Figure 1
Transmitter Logic Waveform).
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).
SCD4468D Rev E
TX DATA IN
TX/RX
DRIVER
TX DATA IN
ACTIVE
FILTER
OUTPUT
STAGE
REFERENCE
COMP.
ACTIVE
FILTER
COMP.
TX/RX
TX INHIBIT
+5 V
RX DATA OUT
GND
STROBE
INPUT
AMPLIFIER
RX DATA OUT
BLOCK DIAGRAM (WITHOUT TRANSFORMER), 1/2 OF UNIT SHOWN
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTES:
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
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.
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED
SCD4468D Rev E
2
ABSOLUTE MAXIMUM RATINGS
Operating Case Temperature
-55°C to +125°C
Storage Case Temperature
-65°C to +150°C
Positive Power Supply Voltage
-0.3 VDC to +7.0 VDC
Receiver Differential Input
±10V
Receiver Input Voltage (Common Mode)
±5V
Driver Peak Output Current
650 mA
Total Package Power Dissipation over the Full Operating
Case Temperature Range
2 Watts
(Note: Normal operation conditions require one transmitter
on and the other off at any given time)
Maximum junction to Case Temperature
10°C
Thermal resistance – Junction to Case
5°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
Parameter
Condition
Symbol
Min
Typ
Max
Unit
"0" Input Current
VIN = 0.4V
IILD
-
-0.2
-0.4
mA
"1" Input Current
VIN = 2.7V
IIHD
-
1
40
µA
"0" Input Voltage
VILD
-
-
0.7
V
"1" Input Voltage
VIHD
2.0
-
-
V
INHIBIT CHARACTERISTICS
"0" Input Current
VIN = 0.4V
IILI
-
-0.1
-0.2
mA
"1" Input Current
VIN = 2.7V
IIHI
-
1.0
40
µA
"0" Input Voltage
VILI
-
-
0.7
V
"1" Input Voltage
VIHI
2
-
-
V
Delay from TX inhibit, (0➝1) to inhibited output
tDXOFF
-
200
300
nS
Delay from TX inhibit, (1➝0) to active output
tDXON
-
80
150
nS
Differential Output Noise, inhibit mode
VNOI
-
2
10
mVp-p
ZOI
2K
-
-
Ω
VO
6.5
7.5
8.0
Vp-p
tr
100
170
300
nS
VOS
-
-
±90
mVpeak
tDTX
-
100
200
nS
Differential Output Impedance (inhibited)
Note 1
Note 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5.
OUTPUT CHARACTERISTICS
Differential output level
RL = 35Ω
Rise and fall times (10% to 90% of Vp-p output)
Output Offset at point A-A' on Figure 5, 2.5µS after
midpoint crossing of the parity bit of the last word
of a 660µS message
RL = 35Ω
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
SCD4468D Rev E
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
Parameter
Condition
Symbol
Min
Typ
Max
Unit
VIDR
-
-
20
Vpk
CMRR
45
-
-
dB
Differential Voltage Range, Figure 4 Point P-P’
Common Mode Rejection Ratio (Note 3)
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
"0" Input Current
VS = 0.4V
IIL
-
-0.2
-0.4
mA
"1" Input Current
VS = 2.7V
IIH
-
1
+40
µA
"0" Input Voltage
VIL
-
-
0.7
V
"1" Input Voltage
VIH
2.0
-
-
V
Strobe Delay (Turn-on)
tSD(ON)
-
40
100
nS
Strobe Delay (Turn-off)
tSD(OFF)
-
60
100
nS
VTH
0.60
0.8
1.15
Vp-p
THRESHOLD CHARACTERISTICS (SINEWAVE INPUT )
Input Threshold Voltage (Referred to the bus)
100KHz1MHz
OUTPUT CHARACTERISTICS, RX DATA AND RX DATA
"1" State
IOH = -0.4 mA
VOH
2.5
3.7
-
V
"0" State
IOL = 4 mA
VOL
-
0.3
0.5
V
tDRX
-
250
400
nS
Delay, (average)from differential input zero
crossings to RX DATA and RX DATA output
50% points
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
Note 2. VCC = 5 Volts ±0.1 V, for all measurements unless otherwise specified.
Note 3. Specifications apply over the case temperature range of -55°C to +125°C unless otherwise specfied.
Note 4. All typical values are measured at +25°C.
SCD4468D Rev E
4
LAST BIT
tf*
90%
Magnified View
OUTPUT OFFSET*
6.5V P-P MIN
8.0V P-P MAX
0 Volts
0 volts
OUTPUT OFFSET*
10%
2.5 µsec
tr *
*Offset measured at point A-A’ in Figure 5
* Rise and fall times measured at point A-A’ in Figure 5
FIGURE 3 – TRANSMITTER (TX) OUTPUT
WAVEFORM
FIGURE 4 – TRANSMITTER (TX) OUTPUT
OFFSET
POWER DISSIPATION
MILLIWATTS
1600
1400
70Ω
70Ω
1200
Maximum
1000
ZO
800
Typical
600
TX DATA OUT
52.5Ω
1:2.5
P
B
A
400
DUT
200
0
0
10
20
30
40
50
60
70
80
90 100
TX DATA OUT
Center
Tap
P'
1:1.77 for
stub
coupling
A'
B'
52.5Ω
DUTY CYCLE – PERCENT
RX DATA IN
Note: Vcc = +5 Volts, VBUS (point A-A') at 7.5 Volts P-P
RX DATA IN
FIGURE 5 – POWER DISSIPATION VS.
DUTY CYCLE
FIGURE 6 – TYPICAL TRANSFORMER
CONNECTION
(Total hybrid with one channel transmitting
and the other not powered)
SCD4468D Rev E
5
PACKAGE OUTLINE DRAWINGS
"FLAT Package"
.990
1.010
.890
.910
.100
BSC
ESD
.008
.012
Triangle
20
11
.290
.310
10
.400
.016
.020
.050
.075
.098
.122
"DIP Package"
.990
1.010
20
11
.287
.303
.300
10
ESD
.008
.012
Triangle
.025
.045
.150
.MIN
.098
.122
.100
BSC
.05
.016
.020
.890
.910
Notes
1. Dimensions shown are in inches
SCD4468D Rev E
6
CONFIGURATIONS AND ORDERING INFORMATION
Model No.
Receiver Data level
Case
ACT4468D
Normally Low
DIP Package
ACT4468DF
Normally Low
Flat Package
ACT4468DI
Normally High
DIP Package
ACT4468DFI
Normally High
Flat Package
Configuration
Dual
PIN # vs FUNCTION TABLE
Pin
Function
Pin
Function
1
+5VDC A
11
RX DATA OUT B
2
TX/RX A
12
RX DATA OUT B
3
TX/RX A
13
TX INHIBIT B
4
STROBE A
14
TX DATA IN B
5
GROUND A
15
TX DATA IN B
6
+5VDC B
16
RX DATA OUT A
7
TX/RX B
17
RX DATA OUT A
8
TX/RX B
18
TX INHIBIT A
9
STROBE B
19
TX DATA IN A
10
GROUND B
20
TX DATA IN A
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www.aeroflex.com
[email protected]
Aeroflex Microelectronic Solutions reserves the right to
change at any time without notice the specifications, design,
function, or form of its products described herein. All
parameters must be validated for each customer's application
by engineering. No liability is assumed as a result of use of
this product. No patent licenses are implied.
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attributes represented by these three icons:
solution-minded, performance-driven and customer-focused
SCD4468D Rev E
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