ACT4418N (4/05)

Standard Products
ACT4418N Variable Amplitude Transceiver
for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553
& SAE-AS15531
www.aeroflex.com/Avionics
March 4, 2005
FEATURES
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ACT4418 Transceiver meets Macair (A3818, A4905, A5232 and A5690) & MIL-STD-1553A/B
Bipolar supply ±15V to ±12V, logic supply +5V
Variable TX amplitude
Monolithic construction
Voltage source output for higher bus drive power
Variable receiver threshold capability
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 transceiver model ACT4418N is a new generation monolithic transceiver which provide full compliance
with Macair and MIL-STD-1553 data bus while providing variable amplitude control. The device performs the front-end analog
function of inputting and outputting data through a transformer to a Macair data bus.
The ACT4418N can be considered a "Universal" Transceiver in that it is compatible with MIL-STD-1553A/B, Macair (A-3818,
A-4905, A-5232 and A-5690).
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. The ACT4418N active filter design has additional high frequency
roll-off to provide the required Macair low harmonic distortion waveform without increasing the pulse delay characteristics
significantly.
Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high and well as low
duty cycles. An optional receiver input threshold adjustment can be accomplished by the use of the ''External Threshold" terminals.
Variable amplitude is adjusted with 0–10 VDC on the control pin. An optional receiver input threshold adjustment can be
accomplished by the use of the "Set Internal Threshold" terminals.
TRANSMITTER
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 transformer the data
bus signal produced is 7.0 Volts typical P-P at point A-A’ (See Figure 3 or 4). 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 Transmitter Logic Waveforms - Figure 1).
The transmitter utilizes an active filter to suppress harmonics above 1 MHz to meet Macair specifications A-3818, A-4905, A-5232
and A-5690. The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit.
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 Waveforms - Figure 2).
The internal threshold is nominally set to detect data bus signals exceeding 1.05 Vp-p and reject signals less than 0.6 Vp-p when
used with a 1:1 turns ratio transformer (See Figure 3 or 4 for transformer data and typical connection). This threshold setting can
be held by grounding the appropriate pins or modified with the use of external resistors.
A low level at the ''STROBE'' input inhibits the DATA and DATA outputs. If unused, a 2K Ohm pull-up to +5VDC is recommended.
SCD4418N Rev A
TX DATA OUT
TX DATA IN
DRIVER
OUTPUT
STAGE
SHAPING
TX DATA IN
TX INHIBIT
AMP CONTROL
V+
GND
CASE GND
EXT THRESHOLD
DATA
DATA
SET INTERNAL
THRESHOLD
COMP.
DATA
EXT. THRESHOLD
DATA
+5V
-12V or -15V
RX DATA IN
RX DATA IN
TX DATA OUT
RX DATA OUT
V-
ACTIVE
FILTER
INPUT
AMP
COMP.
RX DATA OUT
+12V or +15V
STROBE
BLOCK DIAGRAM (WITHOUT TRANSFORMER
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
Notes: 1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal.
2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
3. DATA and DATA must be in the same state during off time (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
SCD4418N 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
+5VDC to +7VDC
±15VDC to ±18VDC
Logic Input Voltage
-0.3 V to +5.5 V
Receiver Differential Input
±40 V
Receiver Input Voltage (Common Mode)
±10V
Driver Peak Output Current
150 mA
Total Package Power Dissipation over the Full Operating Case
Temperature Range *
3.25 Watts
Maximum Junction to Case Temperature (100% duty cycle)
16.25°C
Junction-Case, Thermal Resistance
5°C/W
* See Aeroflex Application Note # 112 for reference.
ELECTRICAL CHARACTERISTICS – DRIVER SECTION 1/ 2/
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
"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
Note 1
tDXOFF
-
300
450
nS
Delay from TX inhibit, (1➝0) to active output
Note 1
tDXON
-
300
450
nS
-
VNOI
-
0.8
10
mVp-p
Note 2
ZOI
10K
-
-
Ω
VO
18
21
24
Vp-p
VOS
-
-
±90
mVpeak
t R & tF
200
250
300
nS
tDTX
-
220
350
nS
INHIBIT CHARACTERISTICS
Differential Output Noise, inhibit mode
Differential Output Impedance (inhibited) *
* See Aeroflex Application Note # 113 for reference.
OUTPUT CHARACTERISTICS
Differential output Level, Figure 3 Point B-B'
ZO = 70Ω
Output offset at point A-A on Figures 3 or 4, 2.5µS after
midpoint crossing of the last bit
Output rise / fall times (10% to 90% of p-p output)
Delay from 50% point of TX DATA or TX DATA input
to zero crossing of differential output (Note 1)
SCD4418N Rev A
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION 1/ 2/
Parameter
Condition
Symbol
Min
Typ
Max
Unit
f = 1MHz
ZIN
10K
-
-
Ω
Differential Input Voltage Range
-
VIDR
-
-
40
Vp-p
Input Common Mode Voltage Range
-
VICR
10
-
-
Vp-p
Common Mode Rejection Ratio
-
CMRR
40
-
-
dB
Differential Input Impedance
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 or Turn-off)
-
tSD
-
40
150
nS
VTH
0.60
0.80
1.10
Vp-p
THRESHOLD CHARACTERISTICS (SINEWAVE INPUT)
Point B - B'
1MHz
Internal Threshold Voltage Figure 4
OUTPUT CHARACTERISTICS, RX DATA AND RX DATA
"1" State
IOH = -0.4 mA
VOH
2.5
3.6
-
V
"0" State
IOL = 4 mA
VOL
-
0.35
0.5
V
Receiver Output Skew
Note 6
tRXSK
-
-
10
nS
Delay (average), from differential input zero
crossings to RX DATA and RX DATA output
50% points
Note 7
tDRX
-
300
450
nS
POWER SUPPLY CURRENT 1/ 2/
Duty Cycle
Condition
Symbol
Typ
Max
Unit
Point B-B', ZO = 70 Ω, VO = 29 VP-P
Bit Pattern = FFFFHEX
Figure 4
ICC
IEE
IL
5
25
18
10
35
30
mA
25%
ICC
IEE
IL
20
40
18
30
60
30
50%
ICC
IEE
IL
40
60
18
60
80
30
100%
ICC
IEE
IL
85
105
18
120
140
30
Transmitter Standby
SCD4418N Rev A
4
TYPICAL HYBRID POWER DISSIPATION *
Power Supply Conditions
Condition
PSC1
VCC = +15V
VEE = -15V
VL = +5V
Point B-B', ZO = 70 Ω, VO = 29 VP-P
Bit Pattern = FFFFHEX
Figure 4
Standby
100% Duty
Cycle
Unit
Watts
0.540
2.167
PSC2
VCC = +15V
VEE = -12V
VL = +5V
0.465
1.852
PSC3
VCC = +12V
VEE = -12V
VL = +5V
0.450
1.600
* See Aeroflex Application note# 112 for reference.
Recommended Power Supply Voltage Range
+V
+11.4 Volts to +15.75 Volts
-V
-11.4 Volts to -15.75 Volts
Logic
+4.5 Volts to +5.5 Volts
Notes:
1.
2.
3.
4.
5.
6.
VCC = +15VDC ±0.75V, VEE = -151.VCC = +15VDC ±0.75V, VIL = +5VDC ±0.5V, TC = -55°C to +125°C, unless otherwise specified.
All typical values are measured at +25°C.
Characteristics guaranteed by design, not production tested.
Power ON/OFF, measured from 75KHz to 1MHz at Point A-A’' Figure 4, in accordance with MIL-STD-1553B paragraph 4.5.2.2.2.3.
At point A-A' on Figure 3 or 4, 2.5µS after midpoint crossing of the parity bit of the last word of a 660 µS message.
Receiver skew is defined as the time from the rising edge of RX DATA OUT to the rising edge of RX DATA OUT minus 500 nS, with a sine
wave input of 3 VP-P at 1MHz driven into Point B-B' of Figure 4 or 2.1 VP-P at 1MHz driven into Point B-B' of Figure 3. The specification
maximum is guaranteed for TA = 25°C only. Standard TTL loads applied to RX DATA Outputs.
7. This test is performed while the Transceiver is reading its own transmission. This condition is called "Wraparound". Standard TTL loads
applied to RX DATA Outputs.
SCD4418N Rev A
5
Terminal
TRANSCEIVER
UNDER TEST
Zo
TX DATA OUT
RX DATA IN
Isolation
Transformer
Coupling
Transformer
1:N
1 : 1.414
R
B
A
RX DATA OUT
Data
Bus
Wire
Pair
Isolation
Resistors
R = 0.75 ZO
RX DATA OUT
R
B'
A'
TX DATA OUT
RX DATA IN
Zo
INT INT
RX RX
EXT EXT
RX RX
NC
NC
Transformer turns ratio:
N = 0.707
Recommend Technitrol 1553-1
Terminal Input Impedance B – B'
MIL-STD-1553B para 4.5.2.1.2.3
1KΩ minimum. 75KHz – 1MHz
NOTE: Internal RX Threshold
Wiring Shown
FIGURE 3 – DATABUS INTERFACE USING TRANSFORMER COUPLING
(FIGURE 9, MIL-STD-1553B)
Terminal
TRANSCEIVER
UNDER TEST
TX DATA OUT
RX DATA IN
Zo
Isolation
Transformer
55Ω
1:N
B
RX DATA OUT
A
Data
Bus
Wire
Pair
RX DATA OUT
B'
55Ω
A'
TX DATA OUT
RX DATA IN
Zo
INT
RX
INT
RX
NC
NC
EXT EXT
RX RX
R
Transformer turns ratio:
N=1
Recommend Technitrol 1553-1
R
Terminal Input Impedance B – B'
MIL-STD-1553B para 4.5.2.2.2.3
2KΩ minimum. 75KHz – 1MHz
NOTE: External RX Threshold Wiring
Shown – R < 10K Ohms.
FIGURE 4 – DATABUS INTERFACE USING DIRECT COUPLING
(FIGURE 10, MIL-STD-1553B)
SCD4418N Rev A
6
LAST BIT
tf *
90%
Magnified View
OUTPUT OFFSET*
6.0VP-P MIN
8.5VP-P MAX
0 volts
0 Volts
OUTPUT OFFSET*
10%
2.5 µsec
tr*
* Offset measured at point A-A’ in Figure 3 or 4
* Rise and fall times measured at point A-A’ in Figure 3 or 4
FIGURE 5 – TRANSMITTER (TX) OUTPUT
WAVEFORM
FIGURE 6 – TRANSMITTER (TX) OUTPUT
OFFSET
VP-P @ B–B'
4.0
30
TYPICAL
27
3.6
3.2
POWER DISSIPATION
WATTS
OUTPUT AMPLITUDE
24
21
18
15
12
Slope = 3VP-P/Vdc
9
6
2.8
2.4
2.0
PSC 1
PSC 2
1.6
PSC 3
1.2
0.8
0.4
3
0
0
1
2
3
4
5
6
7
8
9
0
0
Vdc
10
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE, PERCENT
CONTROL VOLTAGE
FIGURE 7 – TRANSMITTER (TX) OUTPUT
AMPLITUDE vs. CONTROL VOLTAGE
FIGURE 8 – TYPICAL POWER DISSIPATION
vs. DUTY CYCLE
SCD4418N Rev A
7
CONFIGURATIONS AND ORDERING INFORMATION
Model No.
Receiver Data level
ACT4418N
Normally Low
Plug In
ACT4418N-2
Normally Low
Flat Pack
Special Note
Configuration
Use the ACT4418N To replace the ARX4418
PACKAGE CONFIGURATION OUTLINE
PLUG-IN PACKAGE
1.27 MAX
1.10
24
13
1.27
MAX
1.10
1
12
0.175
MAX
0.24
MIN
0.018 DIA.
±0.002
FLAT PACKAGE
Pin Function
0.100
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
TX DATA OUT
TX DATA OUT
TX GND (+5)
+15V (TX)
EXT. DATA THRES
INT. DATA THRES
RX DATA OUT
STROBE
RX GND (+5V)
RXDATA OUT
INT. DATA THRES
EXT. DATA THRES
+15V (RX)
AMP CONTROL
RX DATA IN
RX DATA IN
GND
CASE GND
-15V (RX)
+5V
TX INHIBIT
TX DATA IN
TX DATA IN
-15V(TX)
1.27 MAX
0.017
±0.002
Pin 1 & ESD
Designator
1.27
MAX
0.10 Typ
0.400
MIN
2 sides
0.009
±0.002
0.167 for Low Profile Flat Pack
0.200 for Std Flat Pack
0.080
±0.015
Notes
1. Dimensions shown are in inches.
2. Pins are equally spaced at 0.100±0.002 tolerance, non-cumulative, each row.
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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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SCD4418N Rev A
8
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