Figure 3 – Transmitter (TX) Output Waveform
Figure 4 – Transmitter (TX) Output Offset
LAST BIT
t
f
*
90%
Magnified View
OUTPUT OFFSET
*
6V P-P MIN
7.7V P-P MAX
0 Volts
0 volts
OUTPUT OFFSET
*
10%
2.5 µsec
t
r
*
* Rise and fall times measured at point A-A’ in Fig 5
*Offset measured at point A-A’ in Fig 5
Figure 5 – Typical Transformer Connection
Direct Stub
+5V
6.8µF
0.1µF
Figure 6 – Power Dissipation vs. Duty Cycle
2200
2000
Z
O
Z
O
Z
O
1
4
5
6
23-26
52
51
1800
1600
POWER DISSIPATION
MILLIWATTS
1400
1200
1000
800
Typical
600
400
200
0
10
20
30
40
50
60
70
80
90 100
Maximum
10,11,33,34
TX DATA OUT
18-21
1:2.5
55Ω
A
ACT4438-1
TX DATA OUT
RX DATA IN
RX DATA IN
RISET
37
2
3
7
8
A’
55Ω
GND
9,35,39,50
Transformer Model:
Use Pulse/Technitrol
Part# 1553-45 or equivalent
2.7KΩ
DUTY CYCLE – PERCENT
Note: Vcc = 5 Volts, V
bus
(pt A-A') at 7.5 Volts P-P
Configurations and Ordering Information
Model No.
Screening Level
Industrial Temperature
-55°C to +90°C
Receiver and Transmitter
Data Levels
(See Figure 1)
Normally Low
Case
ACT4438-1
56 Bump Chip
Carrier
Aeroflex Circuit Technology
5
SCD4438-1 REV A 11/19/01 Plainview NY (516) 694-6700
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
