ADM3202/ADM3222/ADM1385

–4–

REV. A

PIN FUNCTION DESCRIPTIONS

Mnemonic

Function

Power Supply Input: +3.3 V

± 0.3 V.

V+

Internally Generated Positive Supply

(+6 V Nominal).

V–

Internally Generated Negative Supply

(–6 V Nominal).

GND

Ground Pin. Must be connected to 0 V.

C1+, C1–

External Capacitor 1 is connected between these

pins. 0.1

µF capacitor is recommended but larger

capacitors up to 47

µF may be used.

C2+, C2–

External Capacitor 2 is connected between these

pins. 0.1

µF capacitor is recommended but larger

capacitors up to 47

µF may be used.

Transmitter (Driver) Inputs. These inputs accept

TTL/CMOS levels.

Transmitter (Driver) Outputs. These are RS-232

signal levels (typically

±9 V).

Receiver Inputs. These inputs accept RS-232

signal levels. An internal 5 k

Ω pull-down resistor

to GND is connected on each input.

Receiver Outputs. These are CMOS output logic

levels.

EN

(ADM3222) Receiver Enable, Active Low. When

low, the receiver outputs are enabled. When high,

they are three-stated.

SD

(ADM3222) Shutdown Control. Active Low.

When low, the charge pump is shut down and

the transmitter outputs are disabled.

SD

(ADM1385) Shutdown Control. When low, the

charge pump is shut down and all transmitters

and receivers are disabled.

DD

(ADM1385) Driver Disable. When low, the

charge pump is turned off and the transmitters

are disabled. The receivers remain active.

PIN CONNECTIONS DIP (N, R Packages)

PIN CONNECTIONS DIP (RS, RU Packages)

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

ADM1385

(SSOP)

NC = NO CONNECT

NC

C1+

V+

C1–

V–

C2–

C2+

NC

GND

DD

SD

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

C1+

V+

C1–

C2+

C2–

V–

GND

ADM3202

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

ADM3222

(SSOP

TSSOP)

NC = NO CONNECT

C1+

V+

C1–

V–

C2–

C2+

NC

GND

NC

EN

SD

TOP VIEW

(Not to Scale)

18

17

16

15

14

13

12

11

10

1

2

3

4

5

6

7

8

9

ADM3222

EN

C1+

V+

C1–

V–

C2–

C2+

SD

GND