AD7306

–4–

REV. D

PIN FUNCTION DESCRIPTION

SOIC

DIP

Pin

Pin

Mnemonic

Function

1

19

V+

2, 3

20, 22

C1+, C1–

423

524

61

72

83

94

10

5

11

6

12, 13

16, 21

NC

14, 18

7, 11

GND

15

8

232/422 SEL

16

9

17

10

19

12

20

13

21

14

22, 23

15, 17

C2+, C2–

24

18

V–

Internally Generated Positive Supply (+9 V nominal). A 0.1

µF capacitor must be connected

between this pin and GND.

External Capacitor 1 Terminals. A 0.1

µF capacitor must be connected between these pins.

RS-232 Receiver R2 Input. This input accepts RS-232 input voltages.

RS-232 Transmitter (Driver) T1 Output (Typically

±7.5 V).

RS-232 Transmitter (Driver) T2 Output (Typically

±7.5 V).

Power Supply Input (5 V

± 5%).

RS-422 Receiver R1, Differential Input B.

Receiver R1 Input. May be configured to accept either single ended RS-232 levels or

differential RS-422 levels. It is configured using the 232/422 SEL pin.

RS-422 Transmitter (Driver) T3, Differential Output B.

No Connect Pins.

Ground Pin. Must be connected to 0 V.

Select Input. This input configures Receiver R1 to accept either RS-232 or RS-422 signal lev-

els. A Logic 1 on this input selects 232 operation while a Logic 0 selects 422 operation.

TTL/CMOS Input to the RS-422 Transmitter T3.

TTL/CMOS Output from Receiver R1.

TTL/CMOS Input to RS-232 Transmitter T2.

TTL/CMOS Input to RS-232 Transmitter T1.

TTL/CMOS Output from Receiver R2.

External Capacitor 2 Terminals. A 0.1

µF capacitor must be connected between these pins.

Internally Generated Negative Supply (–9 V nominal). A 0.1

µF capacitor must be connected

between this pin and GND.

PIN CONFIGURATIONS

SOIC

V+

C1+

C1–

V–

C2–

C2+

GND

NC

NC

NC = NO CONNECT

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

16

15

14

13

20

19

18

17

AD7306

SOIC

TOP VIEW

(Not to Scale)

GND

R1

T2

OUT

T1

OUT

R2

IN

R1

T3

R2

OUT

T3

IN

232/422 SEL

V

CC

R1

OUT

T1

IN

T2

IN

T3

DIP

R1

V+

C1+

C1–

V–

C2–

C2+

GND

NC

NC

T2

OUT

T1

OUT

R2

IN

R1

T3

R2

OUT

T3

IN

232/422 SEL

V

CC

NC = NO CONNECT

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

16

15

14

13

20

19

18

17

AD7306

DIP

TOP VIEW

(Not to Scale)

GND

R1

OUT

T1

IN

T2

IN

T3