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eroflex Circuit T
– Data Bus Modules For The Future © SCD4808 REV E 12/9/99
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
ACT4808 Transceiver
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
VEE
RX DATA IN
RX DATA IN
VCC
STROBE
DRIVER
INPUT
AMP
SHAPING
V-
ACTIVE
FILTER
OUTPUT
STAGE
V+
COMP.
COMP.
Block Diagram (without Transformer), 1/2 of unit shown
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
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.
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
produced is 6.5 Volts minimum P-P at
A-A’. When both DATA and DATA
O), the data bus signal
echnology
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
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
1MHz to meet Macair specifications
A-3818, A-4905, A-5232 and
A-5690. The transmitter may be
Figure 1 – Transmitter Logic Waveforms
DATA IN
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
, and represent positive and
DATA
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.
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
3. DATA and DATA
inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
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: 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
2
Note overlap
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Absolute Maximum Ratings, Per Channel
Operating Case Temperature
Storage Case Temperature
-55°C to +125°C
-65°C to +150°C
Power Supply Voltages ±16 V +7 V
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
Maximum Junction to Case Temperature
3.6 Watts
18°C
Junction-Case, Thermal Resistance 5°C/W
Electrical Characteristics Per Channel, Transmitter Section
1/ 2/
Input Characteristics, TX DATA IN or TX DATA IN
Parameter Condition Symbol Min Typ Max Unit
"0" Input Current VIN = 0.4 V I
"1" Input Current V
= 2.7 V I
IN
"0" Input Voltage - V
"1" Input Voltage - V
ILD
IHD
IHD
IHD
2.0 - - V
-0.2 -0.4 mA
-
-
1.0
40 µA
- - 0.7 V
Inhibit Characteristics
"0" Input Current V
"1" Input Current V
"0" Input Voltage - V
"1" Input Voltage - V
Delay from TX inhibit(0→1) to inhibited output - t
Delay from TX inhibit, (1→0) to active output - t
Differential output noise, inhibit mode 3
Differential output impedance
* 4/ Z
= 0.4 V I
IN
= 2.7 V I
IN
/ V
* 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) 10% - 90% t
Delay from 50% point of TX DATA or TX DATA
input to
zero crossing of differential output.
Pt. B - B’
= 70Ω
Z
O
5/
- t
ILI
IHI
ILI
IHI
DXOFF
DXON
NOI
OI
V
O 26
V
OS
& t
R
F
DTX
-0.2 -0.4 mA
-
- 1.0 40
µA
- - 0.7 V
2 - - V
- 300 450 nS
- 300 450 nS
- 0.8 10 mVp-p
2K - - Ω
18
29
21
-
-
-
-
32
25
±360
±250
Vp-p
Vp-p
mVpk
mVpk
200 250 300 nS
240 300 nS
3
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Electrical Characteristics Per Channel, Receiver Section
1/ 2/
Parameter Condition Symbol Min Typ Max Unit
Differential Input Impedance f = 1MHz Z
Differential Input Voltage Range - V
Input Common Mode Voltage Range
Common Mode Rejection Ratio
- V
- CMRR
Strobe Characteristics (Logic "0" Inhibits Output)
"0" Input Current VS = 0.4 V I
"1" Input Current V
= 2.7 V I
S
"0" Input Voltage - V
"1" Input Voltage - V
Strobe Delay (Turn-on or Turn-off) - t
Threshold Characteristics (Sinewave Input )
Internal Threshold Voltage Fig. 4
Pt. B - B’
1MHz
Output Characteristics, RX DATA and RX DATA
"1" State I
"0" State I
Receiver Output Skew 6
Delay (average), from differential input zero
crossings to RX DATA and RX DATA
output
50% points
= -0.4 mA V
OH
= 4 mA V
OL
/ t
7/ t
IN
IDR
ICR
IL
IH
IH
SD
V
TH
OH
RXSK
DRX
IL
OL
10K -
- -
10
40
- - Vp-p
- -
-
40
Ω
Vp-p
dB
- -0.2 -0.4 mA
- 1.0 +40 µA
- - 0.7 V
2.0 - - V
- - 150 nS
0.60 0.80 1.10 Vp-p
2.5 3.6 - V
- 0.35 0.5 V
- - 10 nS
- 300 450 nS
Power Supply Currents Per Channel
1/ 2/
VCC = +12V to +15V, VEE = -12V to -15V, VL = +5V
Std Version -L Version
Duty Cycle Condition Symbol
Unit
Typ Max Typ Max
Transmitter
Standby
25%
Pt. B - B’
= 70 Ω,
Z
O
VO = 29 VPK-PK
Bit Pattern = FFFF
Fig. 4
HEX
50%
100%
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
60
75
35
85
105
35
110
130
35
160
180
35
5
25
18
20
40
18
40
60
18
85
105
18
10
35
30
30
60
30
mA
60
80
30
120
140
30
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Power
Supply
Conditions
Typical Hybrid Power Dissipation*, Per Channel
Std Version -L Version
Condition
Standby
100%
Duty
Cycle
Standby
100%
Duty
Cycle
Unit
Pt. B - B’
Z
= 70 Ω,
O
VO = 29 VPK-PK
Bit Pattern = FFFF
Fig. 4
1.325 3.250 0.540 2.167
HEX
1.118 3.142 0.465 1.852
1.085 2.472 0.450 1.600
V
V
V
V
V
V
PSC1
CC
EE
V
L
PSC2
CC
EE
V
L
PSC3
CC
EE
V
L
= +15V
= -15V
= +5V
= +15V
= -12V
= +5V
= +12V
= -12V
= +5V
* 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
Watts
Notes:
CC = +15Volts ±0.75V, VEE = -15Volts ±0.75V, VIL = +5Volts ±0.5V, TC = -55°C to +125°C, unless otherwise
1. V
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 VPK-PK at 1MHz driven into Pt. B-B’ of Figure 4 or 2.1 VPK-PK at 1MHz
driven into Pt. B-B’ of Figure 3. The specification maximum is guaranteed for T
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.
A = 25°C only. Standard TTL loads
5
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Terminal
TRANSCEIVER
UNDER TEST
TX DATA OUT
RX DATA IN
RX DATA OUT
RX DATA OUT
TX DATA OUT
RX DATA IN
Isolation
Transformer
1 : N
B
B'
Coupling
Transformer
1 : 1.414
R
Isolation
Resistors
R = 0.75 Z
R
O
Zo
A
A'
Zo
Terminal Input Impedance B – B'
Transformer turns ratio:
N = 0.707
Recommend Technitrol 1553-1
MIL-STD-1553B para 4.5.2.1.2.3
Ω minimum. 75KHz – 1MHz
1K
Figure 3 – Databus Interface Using Transformer Coupling (Figure 9, MIL-STD-1553B)
Data
Bus
Wire
Pair
Terminal
TRANSCEIVER
UNDER TEST
TX DATA OUT
RX DATA IN
RX DATA OUT
RX DATA OUT
TX DATA OUT
RX DATA IN
Isolation
Transformer
1 : N
55Ω
B
B'
Transformer turns ratio:
N = 1
Recommend Technitrol 1553-1
55Ω
A
A'
Terminal Input Impedance B – B'
MIL-STD-1553B para 4.5.2.2.2.3
Ω minimum. 75KHz – 1MHz
2K
Figure 4 – Databus Interface Using Direct Coupling (Figure 10, MIL-STD-1553B)
Zo
Data
Bus
Wire
Pair
Zo
6
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Figure 5 – Transmitter (TX) Output Wave form Figure 6 – Transmitter (TX) Output offset
POWER DISSIPATION
WATTS
POWER DISSIPATION
WATTS
LAST BIT
tf*
90%
6.5V P-P MIN
8.0V P-P MAX
10%
tr*
* Rise and fall times measured at point A-A’ in Figure 3 or 4
Figure 7 – Typical Hybrid Power Dissipation
vs. Duty Cycle (Per Channel)
4.0
3.6
3.2
2.8
2.4
2.0
PSC 1
1.6
1.2
0.8
0.4
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE, PERCENT
PSC 2
PSC 3
0 Volts
Magnified View
0 Volts
2.5 µsec
*Offset measured at point A-A’ in Figure 3 or 4
Figure 8 – Typical Hybrid Power Dissipation
vs. Duty Cycle (Per Channel) -L Version
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE, PERCENT
OUTPUT OFFSET*
OUTPUT OFFSET
PSC 1
PSC 2
PSC 3
*
Configurations and Ordering Information
Model Number’s.
DESC No.
ACT4808D
ACT4808LD
TBA Normally Low Plug In
ACT4808DF
ACT4808LDF
ACT4808DI
ACT4808LDI
ACT4808DFI
ACT4808LDFI
TBA Normally Low
TBA Normally High Plug In
TBA Normally High
Receiver Data level
7
Case
Flat Pack
Flat Pack
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Aeroflex Circuit Technology SCD4808 REV E 12/9/99 Plainview NY (516) 694-6700
Specifications subject to change without notice.
Plainview New York 11803
Toll Free Inquiries: 1-(800) THE-1553
CIRCUIT TECHNOLOGY
Dual In Line
1.90 MAX
Pin 1 & ESD
Designator
±0.002
1.70
19
18
.097
0.78
MAX
0.24
MIN
36
0.018 DIA.
Flat Package
0.78 MAX
19
1.90 MAX
36
4 Places
0.097
0.40
MIN
2 SIDES
Notes
1. Dimensions shown are in inches
2. Pins are equally spaced at 0.100±0.002 tolerance,
non-cumulative, each row
18
0.086 R
0.175 MAX
0.065
REF
±0.002
0.085
0.600
0.015
±0.002
0.10 Typ
Pin 1 & ESD
Designator
0.010
Pin Numbers & Functions
Pin # Function Channel
1 TX DATA OUT A
2 TX DATA
3 GROUND A
4 NC
5 RX DATA OUT A
6 STROBE A
7 GROUND A
8 RX DATA
9 CASE
10 TX DATA OUT B
11 TX DATA
12 GROUND B
13 NC
14 RX DATA OUT B
15 STROBE B
16 GROUND B
17 RX DATA
18 NC
19 VCC B
20 RX DATA IN B
21 RX DATA
22 GROUND 3 B
23 VEE B
24 +5V B
25 INHIBIT B
26 TX DATA IN B
27 TX DATA
28 VCC A
29 RX DATA IN A
30 RX DATA
31 GROUND A
32 VEE A
33 +5 V A
34 INHIBIT A
35 TX DATA IN A
36 TX DATA
OUT A
OUT A
OUT B
OUT B
IN B
IN B
IN A
IN A
Aeroflex Circuit Technology
35 South Service Road
8
Telephone: (516) 694-6700
FAX: (516) 694-6715
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