ACT4808 Dual Transceivers for
MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553
Features
• ACT4808 Dual Transceiver meets
MIL-STD-1553A & B, Macair A3818, A5690, A5232
and A4905 specs
•
New
Low Power Model –L Available
• Operates with ±12V to ±15V & +5V Power Supplies
• Voltage source output for higher bus drive power
• Plug-in or Flat Package
• Monolithic construction using linear ASICs
• Processed and Screened to MIL-STD-883 specs
www.aeroflex.com/act1.htm
CIRCUIT TECHNOLOGY
General Description:
The Aeroflex Laboratories transceiver
model ACT4808 is a new generation
Dual monolithic transceiver which
provides full compliance with Macair
and
MIL-STD-1553
data
bus
requirements
The model ACT4808 performs the
front-end analog function of inputting
and outputting data through a
transformer to a MIL-STD-1553 or
Macair data bus. The ACT4808 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 this transceiver 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 ACT4808
series 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.The
receiver input threshold is set
Internally.
ACT4808 Transceiver
TX DATA OUT
TX DATA IN
TX DATA IN
V+
TX INHIBIT
DRIVER
SHAPING
OUTPUT
STAGE
TX DATA OUT
COMP.
RX DATA OUT
Transmitter
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus as per
Figure 3 or 4 and by two 70 Ohm
terminations (Z
O
), the data bus signal
produced is 6.5 Volts minimum P-P at
A-A’. When both DATA and DATA
+5 V
V
EE
RX DATA IN
RX DATA IN
V
CC
STROBE
INPUT
AMP
V-
ACTIVE
FILTER
COMP.
RX DATA OUT
Block Diagram (without Transformer), 1/2 of unit shown
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCD4808 REV E 12/9/99
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 (Pt. A-A’).
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 1.10 Volts P-P and reject
signals less than 0.6 Volts P-P
when used with a 1:1 turns ratio
transformer. (See Figure 4 for
transformer data and typical
connection.)
A low level at the Strobe input
inhibits the DATA and DATA
outputs.
Figure 1 – Transmitter Logic Waveforms
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 2 – Receiver 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
Aeroflex Circuit Technology
2
SCD4808 REV E 12/9/99
Plainview NY (516) 694-6700
Absolute Maximum Ratings, Per Channel
Operating Case Temperature
Storage Case Temperature
Power Supply Voltages
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
Junction-Case, Thermal Resistance
±16 V
-0.3 V to +5.5 V
±40 V
±10V
150 mA
3.6 Watts
18°C
5°C/W
-55°C to +125°C
-65°C to +150°C
+7 V
Electrical Characteristics Per Channel, Transmitter Section
1/ 2/
Input Characteristics, TX DATA IN or TX DATA IN
Parameter
Condition
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
V
IN
= 0.4 V
V
IN
= 2.7 V
-
-
Symbol
I
ILD
I
IHD
V
IHD
V
IHD
Min
-
-
-
2.0
Typ
-0.2
1.0
-
-
Max
-0.4
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
*
V
IN
= 0.4 V
V
IN
= 2.7 V
-
-
-
-
3/
4/
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
-
-
-
2
-
-
-
2K
-0.2
1.0
-
-
300
300
0.8
-
-0.4
40
0.7
-
450
450
10
-
mA
µA
V
V
nS
nS
mVp-p
Ω
*
See Aeroflex Application note# 113 for reference.
Output Characteristics
Differential output - Direct coupled stub
Differential output - Transformer coupled stub
(see Fig. 3 and 4)
Differential output offset - Direct coupled stub Fig. 4
Differential output offset - Xformer coupled stub Fig. 3
Differential output rise / fall times (see Fig. 5)
Delay from 50% point of TX DATA or TX DATA input to
zero crossing of differential output.
Aeroflex Circuit Technology
Pt. B - B’
Z
O
= 70
Ω
V
O
26
18
-
-
200
29
21
-
-
250
240
32
25
±360
±250
300
300
Vp-p
Vp-p
mVpk
mVpk
nS
nS
5/
10% - 90%
-
3
V
OS
t
R
& t
F
t
DTX
SCD4808 REV E 12/9/99
Plainview NY (516) 694-6700
Electrical Characteristics Per Channel, Receiver Section
1/ 2/
Parameter
Differential Input Impedance
Differential Input Voltage Range
Input Common Mode Voltage Range
Common Mode Rejection Ratio
Condition
f = 1MHz
-
-
-
Symbol
Z
IN
V
IDR
V
ICR
CMRR
Min
10K
-
10
40
Typ
-
-
-
-
Max
-
40
-
-
Unit
Ω
Vp-p
Vp-p
dB
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
= 0.4 V
V
S
= 2.7 V
-
-
-
I
IL
I
IH
V
IL
V
IH
t
SD
-
-
-
2.0
-
-0.2
1.0
-
-
-
-0.4
+40
0.7
-
150
mA
µA
V
V
nS
Threshold Characteristics (Sinewave Input )
Internal Threshold Voltage Fig. 4
Pt. B - B’
1MHz
V
TH
0.60
0.80
1.10
Vp-p
Output Characteristics, RX DATA and RX DATA
"1" State
"0" State
Receiver Output Skew
Delay (average), from differential input zero
crossings to RX DATA and RX DATA output
50% points
I
OH
= -0.4 mA
I
OL
= 4 mA
6/
7/
V
OH
V
OL
t
RXSK
t
DRX
2.5
-
-
-
3.6
0.35
-
300
-
0.5
10
450
V
V
nS
nS
Power Supply Currents Per Channel
1/ 2/
V
CC
= +12V to +15V, V
EE
= -12V to -15V, V
L
= +5V
Std Version
Duty Cycle
Condition
Pt. B - B’
Z
O
= 70
Ω,
V
O
= 29 V
PK
-
PK
Bit Pattern = FFFF
HEX
Fig. 4
-L Version
Unit
Typ
5
25
18
20
40
18
40
60
18
85
105
18
Symbol
Typ
Max
60
75
35
85
105
35
110
130
35
160
180
35
Max
10
35
30
30
60
30
60
80
30
120
140
30
Plainview NY (516) 694-6700
Transmitter
Standby
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
4
30
50
25
50
70
25
75
45
25
120
140
25
25%
mA
50%
100%
Aeroflex Circuit Technology
SCD4808 REV E 12/9/99
Typical Hybrid Power Dissipation
*
, Per Channel
Std Version
Power
Supply
Conditions
PSC1
V
CC
= +15V
V
EE
= -15V
V
L
= +5V
PSC2
V
CC
= +15V
V
EE
= -12V
V
L
= +5V
PSC3
V
CC
= +12V
V
EE
= -12V
V
L
= +5V
-L Version
Standby
100%
Duty
Cycle
Unit
Condition
Standby
Pt. B - B’
Z
O
= 70
Ω,
V
O
= 29 V
PK
-
PK
Bit Pattern = FFFF
HEX
Fig. 4
100%
Duty
Cycle
1.325
3.250
0.540
2.167
1.118
3.142
0.465
1.852
Watts
1.085
2.472
0.450
1.600
*
See Aeroflex Application note# 112 for reference.
Recommended Power Supply Voltage Range
+V
-V
Logic
+11.4 Volts to +15.75 Volts
-11.4 Volts to -15.75 Volts
+4.5 Volts to +5.5 Volts
Notes:
1. V
CC
= +15Volts ±0.75V, V
EE
= -15Volts ±0.75V, V
IL
= +5Volts ±0.5V, T
C
= -55°C to +125°C, unless otherwise
specified.
2. All typical values are measured at +25°C.
3. Characteristics guaranteed by design, not production tested.
4. 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.
5. At point A-A’ on Figure 3 or 4, 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message.
6. 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 V
PK
-
PK
at 1MHz driven into Pt. B-B’ of Figure 4 or 2.1 V
PK
-
PK
at 1MHz
driven into Pt. B-B’ of Figure 3. The specification maximum is guaranteed for T
A
= 25°C only. Standard TTL loads
applied to RX DATA Outputs.
7. This test is peformed while the Transceiver is reading its own transmission. This condition is called "Wraparound".
Standard TTL loads applied to RX DATA Outputs.
Aeroflex Circuit Technology
5
SCD4808 REV E 12/9/99
Plainview NY (516) 694-6700
京公网安备 11010802033920号
EEWORLD
