AEROFLEX ACT4455

ACT 4455 / 4459
SINGLE SUPPLY TRANSCEIVERS
FOR MIL-STD-1553/1760
Features
CIRCUIT TECHNOLOGY
• Single 5 Volt Supply Operation
www.aeroflex.com/act1.htm
• Low Power Dissipation
General Description:
• Small Size & Light Weight
• Single Transceiver Save Space & Cost
• Outstanding MIL-STD-1553 performance
• Processed and Screened to Mil-STD-883
Specs
• Radiation Hard Dielectric Isolation
Monolithic construction for Severe
Environments
• Superior High Frequency Line Transient and
Input Ripple Rejection
• Input and Output TTL Compatible Design
• DESC SMD# 5962-96741
TX DATA OUT
TX DATA IN
DRIVER
TX DATA IN
ACTIVE
FILTER
OUTPUT
STAGE
REFERENCE
COMP.
ACTIVE
FILTER
COMP.
TX DATA OUT
TX INHIBIT
+5 V
RX DATA OUT
+5V RTN
RX DATA IN
RX DATA IN
INPUT
AMPLIFIER
RX DATA OUT
STROBE
Block Diagram (without Transformer)
The Aeroflex Circuit Technology
ACT4455 / 4459 series are next
generation monolithic transceiver
designs
which
provides
full
compliance with MIL-STD-1553A/B
and 1760 requirements in the
smallest packages with low power
consumption and single power supply
operation.
The ACT4455 / 4459 series
performs the front-end analog
function of inputting and outputting
data through a transformer to the
MIL-STD-1553 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.
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, isolated on
the data bus side with two 52.5 Ohm
fault isolation resistors, and loaded by
two 70 Ohm terminations, the data
bus signal is typically 7.5 Volts P-P
at A-A' (See Figure 5). 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,
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4455 REV A 1/29/98
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
Transmitter may be safely operated
for an indefinite period with the bus
(point A-A') short circuited at 100%
duty cycle.
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.)
A low level at the Strobe input
inhibits the DATA
and DATA
outputs. If unused, a 2K pull-up to
+5 Volts is recommended
The pre-set internal thresholds will
detect data bus signals exceeding
1.20 Volts P-P and reject signals
less than 0.6 volts P-P when used
with a transformer. (See Figure 5 for
transformer
data
and
typical
connection.)
Figure 1 — Transmitter Logic Waveforms Idealized*
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
Note: 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 2 — Receiver Logic Waveforms Idealized*
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
Note overlap
* See Figure 8 For Actual Waveforms
Aeroflex Circuit Technology
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SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
Absolute Maximum Ratings
Operating case temperature
-55°C to +125°C
Storage case temperature
-65°C to +150°C
Power supply voltage
-0.3 V to +7.0 V
Logic input voltage
-0.3 V to +5.5 V
Receiver differential input
±10 V
Receiver input voltage (common mode)
±5 V
Driver peak output current
600 mA
Total package power dissipation over the full operating
case temperature rise
2 Watts
(Note: Normal operation conditions require one transceiver on and the
other off.)
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 (Notes 2 & 3 apply)
Parameter
Condition
Symbol
"0" Input Current
VIN = 0.4 V
"1" Input Current
VIN = 2.7 V
Typ
Max
Unit
IILD
-0.2
-0.4
mA
IIHD
1
40
µA
0.7
V
"0" Input Voltage
VILD
"1" Input Voltage
VIHD
Min
2.0
V
Inhibit Characteristics
"0" Input Current
VIN=0.4V
"1" Input Current
VIN=2.7V
IILI
IIHI
"0" Input Voltage
VILI
"1" Input Voltage
VIHI
mA
-0.2
-0.4
1.0
40
µA
0.7
V
V
2.0
Delay from TX inhibit, (0→1) to inhibited output
tDXOFF
250
350
nS
Delay from TX inhibit, (1→0) to active output
tDXON
150
250
nS
Differential output noise, inhibit mode
VNOI
2
10
mVP-P
Differential output impedance (inhibited)
Note 1
ZOI
Ω
2K
Output Characteristics
Differential output level
RL=35 Ω
Rise and fall times(10% to 90% of P-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
VO
tr
RL=35 Ω
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
6
7.5
9
VP-P
100
200
300
nS
± 90
mV peak
250
nS
VOS
tDTX
120
Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ
minimum
Aeroflex Circuit Technology
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SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
Electrical Characteristics — Receiver Section
Parameter
Condition
Symbol
TXFMR
2.12:1
VIDR
Differential Receiver Input Voltage Range
(See Figure 5, point P–P')
Common Mode Rejection Ratio (Note 3)
CMRR
Min
Typ
Max
Unit
14
20
VP-P
45
dB
Strobe Characteristics (Logic "O" Inhibits Output)
"0" Input Current
VS=0.4 V
IIL
-0.2
-0.4
mA
"1" Input Current
VS=2.7V
IIH
1
+40
µA
0.7
V
"0" Input Voltage
VIL
"1" Input Voltage
VIH
Strobe Delay (Turn-on or Turn-off)
tSD
V
2.0
50
100
nS
1.10
V P-P
Threshold Characteristics (Sinewave Input)
Input Threshold Voltage (referred to the bus)
100KHz–1MHz
VTH
0.60
0.82
2.5
3.7
Output Characteristics – RX DATA and RX DATA
"1" State
IOH = -0.4 mA
VOH
"0" State
IOL = -4.0 mA
VOL
0.35
0.5
V
tDRX
340
500
nS
18
30
150
175
50% duty cycle
300
350
100% duty cycle
600
700
+5.00
+5.50
Delay, (average) from Differential Input Zero
Crossings to RX DATA and RX DATA Output
50% points
V
Power Data
Power Supply Currents – Per Channel
Transmitter Standby
25% duty cycle
Note 4
mA
ICC
Power Supply Voltage
VCC
Operating Power Supply Voltage Range
+4.75
V
Note 2: Vcc = 5 Volts ±0.1 V, bypassed by 2.2 µF (Tantalum recommended) Capacitor minimum. All measurements &
specifications apply over the temperature range of -55°C to +125°C (case temperature) unless otherwise
specified.
Note 3: When measured at point A-A’ with ± 10 Volt peak, line to ground, DC to 2MHz
Note 4: Typical power is measured with Vbus at point A-A’ = 7.5 VP-P
Aeroflex Circuit Technology
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SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
Figure 3 – Transmitter (TX) Output Wave form
Figure 4 – Transmitter (TX) Output offset
LAST BIT
tf*
90%
Magnified View
6V P-P MIN
9V P-P MAX
0 Volts
OUTPUT OFFSET
*
OUTPUT OFFSET
*
0 volts
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 5 – Typical direct transformer connection
70Ω
Figure 6 – Power Dissipation vs. Duty Cycle
(Total hybrid with one channel transmitting
and the other not powered)
70Ω
2000
N1:N2
TX DATA OUT
P
B
A
Center
Tap
TX DATA OUT
P'
POWER DISSIPATION
MILLIWATTS
1800
52.5Ω
N1:N3 for
Stub
Coupling
A'
B'
52.5Ω
1600
1400
1200
Maximum
1000
Typical
800
RX DATA IN
600
RX DATA IN
400
200
Transformer turns ratios:
N1:N2 = 1:2.5
N1:N3 = 1:1.77
Use Technitrol 1553-45 or equivalent
Aeroflex Circuit Technology
0
0
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE – PERCENT
Note:Vcc=5 Volts,Transformer ratio 1:2.5, Vbus (pt A-A') at 7.5 Volts P-P
5
SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
Figure 8 ACTUAL HYBRID WAVEFORMS* — 25°C TYPICAL
START OF WORD – 33 WORD TRANSMISSION
TX DATA IN
CH 2
BUS OUT
Point A–A'
See Figure 5
CH 1
RX DATA OUT
CH 3
RX DATA OUT
CH 4
END OF WORD – 33 WORD TRANSMISSION
TX DATA IN
CH 2
BUS OUT
Point A–A'
See Figure 5
CH 1
RX DATA OUT
CH 3
RX DATA OUT
CH 4
* Oscilloscope used is a TEK TDS540 with Probe 6139A.
Aeroflex Circuit Technology
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SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
Figure 7 – Pin Numbers & Functions
ACT4455/4459
Pin #
Aeroflex Circuit Technology
Function
1
TX DATA OUT
2
+5V
3
+5V
4
TX DATA OUT
5
TX DATA OUT
6
GROUND 1
7
NC
8
NC
9
+5V
10
RX DATA OUT
11
STROBE
12
NC
13
RX DATA OUT
14
NC
15
+5V
16
GROUND 3
17
NC
18
RX DATA IN
19
RX DATA IN
20
NC
21
NC
22
GROUND 4
23
+5V
24
INHIBIT
25
TX DATA IN
26
TX DATA IN
27
GROUND 2
28
TX DATA OUT
7
SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
CIRCUIT TECHNOLOGY
Configurations and Ordering Information
Model No.
DESC No.
ACT 4455
5962-96741
ACT 4459
5962-96741
Receiver Data level
Case
Configuration
Normally Low Rx
LCC
Single
Normally High Rx
LCC
Single
ACT4455/4459 LCC LEADLESS CHIP CARRIER
0.055
0.045
0.055
0.045
0.028
0.022
0.055
0.045
0.458
0.442
0.100
MAX
0.458
0.442
Notes
2. Pins are equally spaced at 0.100±0.002 tolerance,
non-cumulative, each row
Telephone: (516) 694-6700
FAX:
(516) 694-6715
Toll Free Inquiries: 1-(800)THE-1553
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11830
Specifications subject to change without notice.
Aeroflex Circuit Technology
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SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700