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ACT4487 Schematic ( PDF Datasheet ) - Aeroflex Circuit Technology

Teilenummer ACT4487
Beschreibung Dual Transceiver
Hersteller Aeroflex Circuit Technology
Logo Aeroflex Circuit Technology Logo 




Gesamt 7 Seiten
ACT4487 Datasheet, Funktion
Standard Products
ACT4487 Dual Transceiver
for MIL-STD-1553A/B, MIL-STD-1760 & SAE-AS15531
www.aeroflex.com/Avionics
August 10, 2005
FEATURES
Small size, light weight and low power dissipation dual 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
DSCC Standard Microcircuit Drawing (SMD): 5962–87579 & 5962-89447
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 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.
Each channel of the dual transceiver is completely separate from the other and fully independent. This includes
power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction.
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.
SCD4487D Rev D






ACT4487 Datasheet, Funktion
PACKAGE CONFIGURATION OUTLINE
PLUG-IN PACKAGE
.097
0.78
MAX
36
1.90 MAX
1.70
0.24
MIN
Pin 1 & ESD
Designator
0.085
19
0.600
18
0.018 DIA.
±0.002
FLAT PACKAGE
0.78 MAX
19 18
0.015
±0.002
1.90 MAX
0.10 Typ
0.097
0.086 R
36 4 Places
0.175 MAX
Pin 1 & ESD
Designator
0.40
MIN
2 SIDES
0.010
±0.002
0.065
REF
Notes
1. Dimensions shown are in inches
2. Pins are equally spaced at 0.100±0.002 tolerance,
non-cumulative, each row
PACKAGE PINS & FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Function
TX DATA OUT
TX DATA OUT
GROUND
NC
RX DATA OUT
STROBE
GROUND
RX DATA OUT
CASE
TX DATA OUT
TX DATA OUT
GROUND
NC
RX DATA OUT
STROBE
GROUND
RX DATA OUT
NC
VCC
RX DATA IN
RX DATA IN
GROUND
VEE
+5V
INHIBIT
TX DATA IN
TX DATA IN
VCC
RX DATA IN
RX DATA IN
GROUND
VEE
+5 V
INHIBIT
TX DATA IN
TX DATA IN
Channel
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
A
A
A
A
A
A
A
A
A
SCD4487D Rev D
6

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