ADM3202/ADM3222/ADM1385
Rev. E | Page 5 of 16
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
PIN CONFIGURATIONS (N, R, RU, AND RW PACKAGES)
C1+
1
V+
2
C1–
3
C2+
4
V
CC
16
GND
15
T1
OUT
14
R1
IN
13
C2–
5
R1
OUT
12
V–
6
T1
IN
11
T2
OUT
7
T2
IN
10
R2
IN
8
R2
OUT
9
ADM3202
TOP VIEW
(Not to Scale)
00071-004
Figure 4. N, R, RU, and RW Packages Pin Configuration
EN
1
C1+
2
V+
3
C1–
4
SD
18
V
CC
17
GND
16
T1
OUT
15
C2+
5
C2–
6
V–
7
R1
IN
14
R1
OUT
13
T1
IN
12
T2
OUT
8
T2
IN
11
R2
IN
9
R2
OUT
10
ADM3222
TOP VIEW
(Not to Scale)
00071-005
Figure 5. N and RW Packages Pin Configuration
PIN CONFIGURATIONS (RS AND RU PACKAGES)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
C1+
V+
C1–
V–
C2–
C2+
EN
V
CC
GND
T1
OUT
NC
R1
OUT
R1
IN
R2
OUT
R2
IN
T2
OUT
NC
T2
IN
T1
IN
SD
ADM3222
(SSOP/TSSOP)
TOP VIEW
(Not to Scale)
NC = NO CONNECT
00071-006
Figure 6. RS and RU Packages Pin Configuration
DD
1
C1+
2
V+
3
C1–
4
SD
20
V
CC
19
GND
18
T1
OUT
17
C2+
5
C2–
6
V–
7
R1
IN
16
R1
OUT
15
T1
IN
14
2
OUT
8
T2
IN
13
R2
IN
9
R2
OUT
12
NC
10
NC
11
NC = NO CONNECT
ADM1385
(SSOP)
TOP VIEW
(Not to Scale)
00071-007
Figure 7. RS Package Pin Configuration
Table 3. Pin Function Descriptions
Mnemonic Description
V
CC
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. A 0.1 μF capacitor is recommended but larger capacitors up to 47 μF
can be used.
C2+, C2–
External Capacitor 2 is connected between these pins. A 0.1 μF capacitor is recommended but larger capacitors up to 47 μF
can be used.
Tx
IN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels.
Tx
OUT
Transmitter (Driver) Outputs. These are RS-232 signal levels (typically ±9 V).
Rx
IN
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected on each input.
Rx
OUT
Receiver Outputs. These are CMOS output logic levels.
EN
(ADM3222 only) Receiver Enable. Active low. When low, the receiver outputs are enabled. When high, they are three-stated.
SD
(ADM3222 only) Shutdown Control. Active low. When low, the charge pump is shut down and the transmitter outputs
are disabled.
SD
(ADM1385 only) Shutdown Control. When low, the charge pump is shut down and all transmitters and receivers are disabled.
DD
(ADM1385 only) Driver Disable. When low, the charge pump is turned off and the transmitters are disabled. The receivers
remain active.
NC No Connect.
