LTC1321/LTC1322/LTC1335
TYPICAL APPLICATI S
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 VDD is between 6.5V
and 10V, and VEE 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).
5V
10
RX IN
EIA562/RS232*
8
TX OUT
15 20 21 6
4
5
TX OUT
LTC1322/LTC1335
RS422
2
100Ω
3
RX IN
7 17 22
1321/22/35 F22
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
Figure 22. Typical EIA562/RS232 to RS422 Level Translator
10
RX IN
EIA562/RS232*
8
TX OUT
5V
15 20 21 6
4
5
RS422
100Ω
LTC1322/LTC1335
2
100Ω
3
7 17 22
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
22 17
2
8
TX OUT
3
LTC1322/LTC1335
EIA562/RS232*
4
10
RX IN
5
6 21 20 15 7
1321/22/35 F23
5V
Figure 23. Typical Cable Extension for EIA562/RS232 Interface
18