Datasheet

18
LTC1321/LTC1322/LTC1335
U
SA
O
PP
L
IC
AT
ITY
P
I
CA
L
The LTC1322/LTC1335 can be used to translate EIA562 to
RS422 interface level or vice versa as shown in Figure 22.
One port is configured as EIA562 transceiver and the other
as RS485 transceiver. The LTC1322 can also support
RS232 to RS422 level translation if V
DD
is between 6.5V
and 10V, and V
EE
is between –6.5V and –10V.
Using two LTC1321/LTC1335 as level translators, the
EIA562/RS232 interface distance can be extended to 4000
feet with twisted wires (Figure 23).
RS422EIA562/RS232*
1321/22/35 F22
100Ω
10
8
7
17 22
212015
6
TX OUT
TX OUT
RX IN
RX IN
5V
2
3
4
5
LTC1322/LTC1335
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
Figure 22. Typical EIA562/RS232 to RS422 Level Translator
RS422
EIA562/RS232*
1321/22/35 F23
100Ω
100Ω
10
8
7
17 22
212015
6
TX OUT
RX IN
5V
2
3
4
5
LTC1322/LTC1335
EIA562/RS232*
20
8
10
15
5V
7
17
22
21
6
2
3
4
5
RX IN
TX OUT
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
LTC1322/LTC1335
Figure 23. Typical Cable Extension for EIA562/RS232 Interface