ACT4487 (2/08)

Standard Products
ACT4487 Single Transceiver
for MIL-STD-1553A/B, MIL-STD-1760 & SAE-AS15531
www.aeroflex.com/Avionics
February 14, 2008
FEATURES
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Small size, light weight and low power dissipation, single transceiver
+5V / ±15V DC power supply operation
Outstanding MIL-STD-1553 / SAE-AS15531 performance
Monolithic construction
Input and output TTL compatible design
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 ACT4487 is the next generation monolithic transceiver design which provides full
compliance with MIL-STD-1553A/B, MIL-STD-1760 and meets SAE-AS15531 requirements in the smallest
package with lower pin count for those designs with less board space. The ACT4487 performs the front-end analog
function of inputting and outputting data through a transformer to the MIL-STD-1553 data bus.
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. 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 1.4:1 ratio
transformer the data bus signal is typically 7.5 Volts P-P at Point 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, 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
Figure 1 Transmitter Logic Waveform). The Transmitter may be safely operated for an indefinite period with the bus
(Point 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 Figure 2 Receiver Logic Waveform).
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 connections).
A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is
recommended.
SCD4487 Rev F
TX DATA IN
TX DATA OUT
DRIVER
TX DATA IN
ACTIVE
FILTER
OUTPUT
STAGE
TX DATA OUT
REFERENCE
COMP.
RX DATA OUT
ACTIVE
FILTER
COMP.
TX INHIBIT
+5 V (VL)
+15 V (+Vcc)
-15 V (-VEE)
GND
CASE
RX DATA IN
RX DATA IN
INPUT
AMPLIFIER
RX DATA OUT
RX STROBE
BLOCK DIAGRAM (WITHOUT TRANSFORMER)
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 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
Note overlap
Note: Outputs shown are for ACT4487 and are Inverted for the ACT4487-I.
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED
SCD4487 Rev F 2/14/08
2
Aeroflex Plainview
ABSOLUTE MAXIMUM RATINGS
Operating case temperature
-55°C to +125°C
Storage case temperature
-65°C to +150°C
Power supply voltage
VCC
VEE
VL
-0.3 VDC to +18 VDC
+0.3 VDC to -18 VDC
-0.3 VDC to +7.0 VDC
Logic input voltage
-0.3VDC to +5.5VDC
Receiver differential input
±40 Vp-p
Receiver input voltage (common mode)
±10V
Driver peak output current
200 mA
Total package power dissipation over the full operating
case temperature range
2.5 Watt
Maximum junction to case temperature
10°C
Thermal resistance – Junction to case
4°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN (Notes 2 & 3 Apply)
Parameter
Condition
Symbol
Min
Typ
Max
Unit
"0" Input Current
VIN = 0.4V
IILD
-
-0.2
-0.2
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
-
-0.1
-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
tDXOFF
-
175
200
nS
Delay from TX inhibit, (1➝0) to active output
tDXON
-
90
200
nS
Differential Output Noise, inhibit mode
VNOI
-
2
10
mVp-p
Point B
ZOI
2K
-
-
Ω
Point C
ZOI
1K
-
-
Ω
Figure 5
Point A
VO
6
7.5
9
Vp-p
tr
100
200
300
nS
Output offset. See Figure 3. 2.5 µS after midpoint
crossing of the parity bit of the last word of a 660µS
message.
VOS
-
-
±90
mVpeak
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
tDTX
-
100
200
nS
Differential Output Impedance (inhibited) Note 1
See Figure 5
OUTPUT CHARACTERISTICS
Differential output level
Rise and fall times (10% to 90% of p-p output)
SCD4487 Rev F 2/14/08
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Aeroflex Plainview
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
Parameter
Differential Voltage Range
(See Figure 5, Point B)
Condition
Symbol
Min
Typ
Max
Unit
TXFMR
1.4:1
VIDR
-
14
20
Vpk
CMRR
45
-
-
dB
Common Mode Rejection Ratio (Note 3)
"1" State – Rx Data or Rx Data Output
IOH = -0.4 mA
VOH
2.5
3.7
-
V
"0" State – Rx Data or Rx Data Output
IOI = 4 mA
VOL
-
0.35
0.5
V
tDRX
-
270
400
nS
VTH
0.60
0.75
1.20
Vp-p
Delay (average) from Differential Input Zero
Crossings to RX DATA and RX DATA Output 50%
points
Input Threshold Voltage (referred to the bus)
100KHz–1MHz
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
"0" Input Current
VS = 0.4V
IIL
-
-0.1
-0.2
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
-
50
100
nS
POWER DATA
POWER SUPPLY CURRENTS
Transmitter Standby
Note 4
ICC
IEE
IL
-
0
12
18
1
16
30
25% Duty Cycle
ICC
IEE
IL
-
45
12
18
50
20
30
50% Duty Cycle
ICC
IEE
IL
-
90
12
18
100
20
30
100% Duty Cycle
ICC
IEE
IL
-
180
12
18
200
20
30
mA
POWER SUPPLY VOLTAGE
±15V Operating Power Supply Voltage Range
VCC
VEE
+14.25
-14.25
+15.00 +15.75
-15.00 -15.75
V
V
+5V Operating Power Supply Voltage Range
VL
+4.50
+5.00
V
+5.50
NOTES:
1. Power on or off, measured from 75KHz to 1MHz at Point A and transformer self impedance of 3KΩ minimum at 1MHz.
2. Power Supplies: ±15VDC ±0.75V & +5VDC ±0.5V, bypassed by by 10 µF (Tantalum recommended) Capacitor minimum. All
measurements & specifications apply over the temperature range of -55°C to +125°C (case temperature) unless otherwise specified.
3. When measured as shown in Figure 5 with ±10Vp, line to ground, DC to 2MHz.
4. Typical power is measured with Vbus at Point A = 7.5 Vp-p.
SCD4487 Rev F 2/14/08
4
Aeroflex Plainview
LAST BIT
Magnified View
*
OUTPUT OFFSET
0 Volts
*
OUTPUT OFFSET
Transformer Coupled Stub
70Ω
2.5 µsec
ACT4487
TX DATA OUT
*Offset measured at Point A in Figure 5
1:1.4 52.5Ω
2:1
3
7
2
FIGURE 3 – TRANSMITTER (TX) OUTPUT
OFFSET
TX DATA OUT
C
A
1
5
T1553-2
52.5Ω
RX DATA IN
Zoi
VCM
RX DATA IN
Direct Coupled Stub
ACT4487
TX DATA OUT
2
TX DATA OUT
3600
RX DATA IN
3200
2.97W
POWER DISSIPATION
MILLIWATTS
1.87W
52.5Ω
Zoi
70Ω
Transformer Model use Technitrol Part# 1553-2
or equivalent
1600
1200
800
FIGURE 5 – TYPICAL 1553 BUS
CONNECTIONS
Typical Hybrid
Dissipation
400
0
0
4
1
T1553-2
A
Typical Hybrid Input Power
2000
0.270
B
RX DATA IN
2800
2400
52.5Ω
1.4:1
8
3
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE – PERCENT
Note: Vcc= +15V, VEE = -15V, VL= +5V, Transformer ratio 1.4:1,
VBUS (Point A) at 7.5VP-P.
FIGURE 4 – POWER DISSIPATION VS.
DUTY CYCLE
SCD4487 Rev F 2/14/08
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Aeroflex Plainview
PIN NUMBERS & FUNCTIONS
Pin #
SCD4487 Rev F 2/14/08
Function
1
TX DATA OUT
2
TX DATA OUT
3
GROUND
4
NC
5
NC
6
NC
7
RX DATA OUT
8
STROBE
9
GROUND
10
RX DATA OUT
11
NC
12
NC
13
VCC
14
NC
15
RX DATA IN
16
RX DATA IN
17
NC
18
CASE
19
VEE
20
+5 V
21
TX INHIBIT
22
TX DATA IN
23
TX DATA IN
24
NC
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Aeroflex Plainview
CONFIGURATIONS AND ORDERING INFORMATION
Model No.
Receiver Data level
ACT 4487
Normally Low
ACT 4487-I
Normally High
ACT 4487-F
Normally Low
ACT 4487-FI
Normally High
Case
Configuration
Plug In
Single
Flat Package
PACKAGE CONFIGURATION OUTLINES
Plug In Package Outline
Flat Package Outline
.200
MAX.
.065
1.315 MAX.
1.385 MAX.
24
.015
13
0.805
MAX.
24
0.600
0.735
MAX.
12
Pin 1 & ESD
Designator
13
Lead 1 & ESD
Designator
12
.375
MIN.
0.200
MAX.
.240
MIN
.015
.100
.100
.010
1.100
(11 Equal Spaces at .100)
.018
1.100
(11 Equal Spaces at .100)
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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www.aeroflex.com
[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.
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, performance-driven and customer-focused
SCD4487 Rev F 2/14/08
7
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