ADM222/ADM232A/ADM242
EN
1
18
SHDN
17
V
CC
16
GND
C1+
1
V+
2
C1–
3
C2+
4
16
V
CC
15
GND
14
T1
OUT
C1+
2
V+
3
C1–
4
C2+
5
ADM242
15
T1
OUT
13
R1
IN
TOP VIEW
C2–
5
(Not to Scale)
12
R1
OUT
ADM232A
TOP VIEW
14
R1
IN
(Not to Scale)
C2–
6
13
R1
OUT
V–
7
12
T1
IN
11
T2
IN
10
R2
OUT
V–
6
T2
OUT 7
R2
IN 8
11
T1
IN
10
T2
IN
9
T2
OUT 8
R2
IN 9
R2
OUT
Figure 9. ADM232A DIP/SOIC Pin Configuration
Figure 11. ADM242 DIP/SOIC Pin Configuration
5V INPUT
C5
0.1 F
6.3V
C5
0.1 F
6.3V
C3
0.1 F
C1
0.1 F
2
5V INPUT
C1
0.1 F
C2
0.1 F
16
V
CC
C1+
2
+5V TO +10V
V+
VOLTAGE DOUBLER
3
C1–
4
C2+
+5V TO
–10V
6
VOLTAGE INVERTER V–
5
C2–
1
11
10
T2
12
R1
9
R2
14
7
13
8
17
C4
0.1 F
T1
OUT
T2
OUT
R1
IN
R2
IN
RS-232
INPUTS
**
TTL/CMOS
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
*
C2
0.1 F
V
CC
C1+
3
+5V TO +10V
V+
VOLTAGE DOUBLER
4
C1–
5
C2+
+5V TO
–10V
7
VOLTAGE INVERTER V–
6
C2–
12
11
T2
13
R1
10
1
GND
9
R2
15
C3
0.1 F
C4
0.1 F
T1
OUT
T2
OUT
R1
IN
R2
IN
RS-232
INPUTS
**
RS-232
OUTPUTS
T1
IN
TTL/CMOS
INPUTS
*
T2
IN
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
T1
T1
IN
T2
IN
R1
OUT
R2
OUT
EN
T1
8
14
ADM232A
GND
15
PULL-UP RESISTOR
ON EACH TTL/CMOS INPUT
**
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
ADM242
16
18
SHDN
*
INTERNAL 400k
PULL-UP RESISTOR
ON EACH TTL/CMOS INPUT
**
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
*
INTERNAL 400k
Figure 10. ADM232A Typical Operating Circuit
Figure 12. ADM242 Typical Operating Circuit
REV.
B
–5–
AD [ ANALOG DEVICES ]
