Datasheet

6
LT1381
TYPICAL APPLICATIO S
U
Isolated RS232 Driver/Receiver
I
LIM
LT1111
FB
SW2
V
IN
SW1
GND
1N5818
L1
20µH
CTX20-1
1:1
47Ω
10k
1k
1N5818
100µF
1Ω
LT1121-5
100µF
V
IN
= 5V
±10% FROM
SYSTEM
5V ±10%
V
CC
GND1
IN
GND2
13.7V
LT1381
RS232
GND2
OS
GND1
V
CC
OS
IN
1
3
4
5
16
2
6
98
11 14
RS232 INPUT
RS232 OUTPUT
V
OUT
V
IN
ISOLATOR OUTPUT
(DATA TO SYSTEM)
ISOLATOR INPUT
(DATA FROM SYSTEM)
LTC1145
LTC1145
ISOLATION BARRIER
FLOATING GROUND
LT1381 • TA03
R
X
D
X
V
CC
15
SYSTEM GROUND
+
+
10µF
+
0.1µF
+
0.1µF
+
0.1µF
+
0.1µF
+
1µF
0.1µF
+
ISOLATOR
OUTPUT
RS232
INPUT
ISOLATOR
INPUT
RS232
OUTPUT
Data Transmission Across Isolation Barrier
1381 TA04 1381 TA05