Figure 3 – Transmitter (TX) Output Offset
Figure 5 – Typical 1553 Bus Connections
LAST BIT
Transformer Coupled Stub
70Ω
Magnified View
OUTPUT OFFSET
ACT 4489
*
*
TX DATA OUT
0 Volts
OUTPUT OFFSET
1 : 0.707
3
7
2
C
1 : 1.4 52.5Ω
A
TX DATA OUT
2.5 µsec
1
5
T1553-1
Zoi
V
CM
52.5Ω
RX DATA IN
RX DATA IN
*
Offset measured at point A in Figure 5
Figure 4 – Hybrid Power Dissipation vs. Duty Cycle
3600
3200
3.0W
POWER DISSIPATION
MILLIWATTS
2800
2400
2000
1600
1200
800
400
0
0
10
20
30
40
50
60
Typical Hybrid
Dissipation
Typical Hybrid Input Power
ACT 4489
Direct Coupled Stub
TX DATA OUT
1:1
3
8
2
B
52.5Ω
A
TX DATA OUT
1.9W
RX DATA IN
RX DATA IN
1
4
T1553-1
52.5Ω
Zoi
70Ω
0.270
70
80
90 100
DUTY CYCLE – PERCENT
Transformer Model use Technitrol Part# 1553-1
or equivalent
Note: Vcc= +12V, V
EE
= -12V, V
L
= +5V, Transformer ratio 1:1,
V
BUS
(point A) at 7VP-P.
Configurations and Ordering Information
ACT
Model # / Ordering Part #
ACT 4489
ACT 4489-I
ACT 4489-F
ACT 4489-FI
Specifications subject to change without notice.
Aeroflex Circuit Technology
Case
Style
Plug In
Plug In
Flat Package
Flat Package
DESC
Number
TBA
TBA
TBA
TBA
Rx Standby
Normally Low
Normally High
Normally Low
Normally High
5
SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
