16

LTC1321/LTC1322/LTC1335

S

APPLICATI

TYPICAL

A typical EIA562/RS232 interface application is shown in

Figure 17 with LTC1322. A typical EIA562 interface appli-

cation with LTC1335 is shown in Figure 18.

A typical connection for RS485 transceiver is shown in

Figure 19. A twisted pair of wires connects up to 32 drivers

and receivers for half duplex multi-point data transmis-

sion. The wires must be terminated at both ends with

resistors equal to the wire’s characteristic impedance,

generally 120

Ω. An optional shield around the twisted pair

helps to reduce unwanted noise and should be connected

to ground at one end.

1/2 LTC1322

1/2 LTC1322

1321/22/35 F17

17

16

15

14

7

DR IN

DR IN

RX OUT

RX OUT

OV

3

2

5

4

8

9

10

11

22

23

20

21

6

RX OUT

RX OUT

DR IN

DR IN

0V

EIA562/

RS232

INTERFACE

LINES

Figure 17. Typical Connection for EIA562/RS232 Interface

Figure 18. Typical Connection for EIA562 Interface

1/2 LTC1335

1/2 LTC1335

1321/22/35 F18

17

16

15

14

7

DR IN

DR IN

RX OUT

RX OUT

OV

3

2

5

4

8

9

10

11

22

23

20

21

6

RX OUT

RX OUT

DR IN

DR IN

0V

EIA562

INTERFACE

LINES

1

OE = 0V

1

OE = 0V

Figure 19. Typical Connection for RS485 Interface

5V

2

1/2 LTC1322/LTC1335

1/2 LTC1322/LTC1335

1/2 LTC1322/LTC1335

1321/22/35 F19

RX OUT

DR ENABLE

DR IN

5V

120

Ω

3

4

5

22

21

20

6

11

10

9

8

7

RX OUT

16

5V

DR ENABLE

54

32

20

DR IN

RX OUT

DR ENABLE

21

22 6

15

DR IN

17

120

Ω