ACT4461-DF (10/04)

Standard Products
ACT4461D Single Supply Dual Transceivers
for MIL-STD-1553
www.aeroflex.com/Avionics
October 11, 2004
FEATURES
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Small size, light weight and low standby power dual transceiver
Dual 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
Processed and screened to MIL-STD-883 specs
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
DESC SMD# 5962–92061 pending
ACT4461DF
Case Style
Actual Size
GENERAL DESCRIPTION
The Aeroflex-Plainview Model ACT4461D is a next generation transceiver which provide full compliance with
MIL-STD-1553/1760 and data bus requirements in the smallest package with the lowest standby power consumption and one
power supply operation.
The dual channel Model ACT4461D 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 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, 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 Figure 5 for transformer data and typical connection).
SCD4461D Rev A
TX/RX
TX DATA IN
DRIVER
SHAPING
OUTPUT
STAGE
REFERENCE
COMP.
ACTIVE
FILTER
COMP.
TX DATA IN
TX/RX
TX INHIBIT
+5 V
RX DATA OUT
GROUND
INPUT
AMP
RX DATA OUT
STROBE
BLOCK DIAGRAM (WITHOUT TRANSFORMER) 1/2 OF UNIT 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
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
SCD4461D Rev A
2
ABSOLUTE MAXIMUM RATINGS
Operating Case Temperature
-55°C to +125°C
Storage Case Temperature
-65°C to +150°C
Power Supply Voltages
-0.3VDC to +7.0VDC
±10 V
Receiver Differential Input
±5V
Receiver Input Voltage (Common Mode)
650 mA
Driver Peak Output Current
2.0 Watts
Total Package Power Dissipation over the Full Operating
Case Temperature Range
(Note: Normal operation conditions require one transmitter on and the
other off at any given time)
10°C
Maximum Junction to Case Temperature (100% duty cycle)
5°C/W
Junction-Case, Thermal Resistance
ELECTRICAL CHARACTERISTICS – DRIVER SECTION 2/ 3/ 4/
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
-
-0.2
-0.4
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
180
nS
Differential Output Noise, inhibit mode
VNOI
-
2
10
mV p-p
Note 1
ZOI
2K
-
-
Ω
RL = 35 Ω
VO
6.5
7.5
8.0
V p-p
tr
100
170
300
nS
VOS
-
-
±90
mV peak
tDTX
-
100
180
nS
Differential Output Impedance (inhibited)
OUTPUT CHARACTERISTICS
Differential output level
Rise and fall times (10% to 90% of p-p output)
Output offset at point A-A’ on Figure 5, 2.5 µS
after midpoint crossing of the parity bit of the
last word of a 600µS message
RL = 35 Ω
Delay from 50% point of TX DATA or
TX DATA input to zero crossing of differential
signal
SCD4461D Rev A
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION 2/ 3/ 4/
Parameter
Condition
Differential Voltage Range, Figure 4 Point P-P’
Common Mode Rejection Ratio
Symbol
Min
Typ
Max
Unit
VIDR
-
-
20
V p-p
CMRR
45
-
-
dB
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
If not used, a 1K pullup to 5V is recommended
"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
0.60
0.80
1.15
V p-p
THRESHOLD CHARACTERISTICS (SINEWAVE INPUT )
Internal Threshold Voltage (Referred to the bus)
100KHz-1MHz
VTH
OUTPUT CHARACTERISTICS, RX DATA AND RX DATA
"1" State
IOH = -0.4mA
VOH
2.5
3.7
-
V
"0" State
IOL = 4mA
VOL
-
0.3
0.5
V
Delay, (average) from differential input zero
crossings to RX DATA and RX DATA output
50% points
tDRX
-
250
400
nS
POWER DATA 2/ 3/ 4/
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
NOTES:
1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5.
2. VCC = 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.
SCD4461D Rev A
4
LAST BIT
tf *
90%
Magnified View
OUTPUT OFFSET*
6V P-P MIN
7.7V P-P MAX
0 volts
0 Volts
OUTPUT OFFSET*
10%
2.5 µsec
tr*
*Offset measured at point A-A’ in Fig 5
* Rise and fall times measured at point A-A’ in Fig 5
FIGURE 3 – TRANSMITTER (TX) OUTPUT
WAVEFORM
70Ω
FIGURE 4 – TRANSMITTER (TX) OUTPUT
OFFSET
70Ω
1600
TX DATA OUT
52.5Ω
1:2.5
P
B
D.U.T
TX DATA OUT
A
Center
Tap
P’
POWER DISSIPATION
MILLIWATTS
ZO
1:1.77 for
stub
coupling
A’
B’
1400
1200
Maximum
1000
800
Typical
600
400
200
52.5Ω
RX DATA IN
0
0
RX DATA IN
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE – PERCENT
Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P
FIGURE 6 – POWER DISSIPATION VS.
DUTY CYCLE
(Total, hybrid with one channel transmitting
and the other not powered)
FIGURE 5 – TYPICAL TRANSFORMER
CONNECTION
SCD4461D Rev A
5
PIN NUMBERS & FUNCTIONS
Pin #
Function
Channel
1
TX DATA OUT/RX DATA IN
A
2
TX DATA OUT/RX DATA IN
A
3
GROUND 1
A
4
RX DATA OUT
A
5
STROBE
A
6
RX DATA OUT
A
7
TX DATA OUT/RX DATA IN
B
8
TX DATA OUT/RX DATA IN
B
9
GROUND 1
B
10
RX DATA OUT
B
11
STROBE
B
12
RX DATA OUT
B
13
GROUND 2
B
14
+5V
B
15
GROUND 3
B
16
INHIBIT
B
17
TX DATA IN
B
18
TX DATA IN
B
19
GROUND 2
A
20
+5V
A
21
GROUND 3
A
22
INHIBIT
A
23
TX DATA IN
A
24
TX DATA IN
A
SCD4461D Rev A
6
CONFIGURATIONS AND ORDERING INFORMATION
Model No.
ACT4461DF
DESC No.
Receiver Data level
5962-92061 (Pending)
Normally Low
ACT4461DFI
Configuration
Dual
Normally High
FLAT PACKAGE CONFIGURATION AND PINOUTS
PIN 1
0.596
MAX
0.410
MIN
0.808
MAX
0.550
11 Equal Spaces
at 0.050
Noncumulative
0.018
MAX
0.010
± 0.003
0.056
MAX
0.095
MAX
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Fax: 719-594-8468
www.aeroflex.com
0.050
± 0.005
[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:
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SCD4461D Rev A
7
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