LTC1334
APPLICATI
S I FOR ATIO
A typical RS422 connection (Figure 15) allows one driver
and ten receivers on a twisted pair of wires terminated with
a 100Ω resistor at one end.
A typical twisted-pair line repeater is shown in Figure 16.
As data transmission rate drops with increased cable
length, repeaters can be inserted to improve transmission
rate or to transmit beyond the RS422 4000-foot limit.
The LTC1334 can be used to translate RS232 to RS422
interface levels or vice versa as shown in Figure 17. One
DR ENABLE
DR IN
5V
RX OUT
22
8
1/2 LTC1334
23
6
7
24
4
100Ω
5
Figure 15. Typical Connection for RS422 Interface
17 22
5V
RX IN
RS232/EIA562
6
TX OUT
5
1/2 LTC1334
7
LTC1334 • F16
24
4
RX IN
100Ω
22
23 8
Figure 16. Typical Cable Repeater for RS422 Interface
5V
17 22
RX IN
RS232/EIA562
DR OUT
11
13
23 8
6
RS422
7
LTC1334
4
100Ω
5
9
19 24
Figure 18. Typical Cable Extension for RS232/EIA562 Interface
U
port is configured as an RS232 transceiver and the other
as an RS485 transceiver.
Using two LTC1334s as level translators, the RS232/
EIA562 interface distance can be extended to 4000 feet
with twisted-pair wires (Figure 18).
AppleTalk
®
/LocalTalk
®
Applications
Two AppleTalk applications are shown in Figure 19 and 20
with the LTC1323 and the LTC1334.
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
W
U
UO
1/2 LTC1334
RX OUT
24
8
5 4
100Ω
12
5V
1/2 LTC1334
13
17
8
18
11
10
LTC1334 • F15
RX OUT
5V
DR ENABLE
DR IN
19
5V
23 8
6
TX OUT
7
LTC1334
RS422
4
100Ω
5
RX IN
LTC1334 • F17
13
TX OUT
11
9
19 24
Figure 17. Typical RS232/EIA562 to RS422 Level Translator
24 19
4
100Ω
5
LTC1334
6
7
8
23
22 17
9
LTC1334 • F18
11
DR OUT
RS232/EIA562
13
RX IN
5V
13
LINER [ LINEAR TECHNOLOGY ]
