ADM222/ADM232A/ADM242
EN
C1+
V+
C1–
C2+
C2–
V–
T2
OUT
R2
IN
1
2
3
4
5
6
7
8
16 V
CC
15 GND
14 T1
OUT
13 R1
IN
TOP VIEW
12 R1
OUT
(Not to Scale)
11 T1
IN
10 T2
IN
9
R2
OUT
1
2
3
4
5
6
7
8
9
18 SHDN
17
V
CC
C1+
V+
C1–
C2+
C2–
V–
T2
OUT
R2
IN
16 GND
ADM232A
ADM242
15
T1
OUT
R1
IN
R1
OUT
TOP VIEW 14
(Not to Scale)
13
12 T1
IN
11 T2
IN
10
R2
OUT
Figure 9. ADM232A DIP/SOIC Pin Configuration
Figure 11. ADM242 DIP/SOIC Pin Configuration
+5V INPUT
C5
0.1µF
6.3V
1
C1
0.1µF
3
4
C2
0.1µF
5
C1+
V
CC
2
C3
0.1µF
+5V INPUT
C5
0.1µF
6.3V
2
C1
0.1µF
4
5
6
C4
0.1µF
14
7
13
8
17
3
C3
0.1µF
+5V TO +10V
V+
C1–VOLTAGE DOUBLER
C2+
+5V TO –10V
V–
VOLTAGE INVERTER
C2–
V
CC
C1+
+5V TO +10V
V+
VOLTAGE DOUBLER
C1–
C2+
C2
0.1µF
6
7
+5V TO –10V
V–
VOLTAGE INVERTER
C2–
15
C4
0.1µF
TTL/CMOS
INPUTS
*
T1
IN
T2
IN
R1
OUT
R2
OUT
11
10
12
9
T1
T2
R1
R2
T1
OUT
T2
OUT
R1
IN
R2
IN
RS-232
OUTPUTS
TTL/CMOS
INPUTS
*
T1
IN
T2
IN
12
11
T1
T2
R1
R2
T1
OUT
8
T2
OUT
14
9
18
R1
IN
R2
IN
SHDN
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
RS-232
INPUTS
**
TTL/CMOS
OUTPUTS
*
R1
OUT
13
R2
OUT
EN
10
1
GND
RS-232
INPUTS
**
ADM232A
GND
15
ADM242
*
INTERNAL 400kΩ PULL-UP RESISTOR
ON EACH TTL/MOS INPUT
16
*
INTERNAL 400kΩ PULL-UP RESISTOR
ON EACH TTL/MOS INPUT
**
INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
**
INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
Figure 10. ADM232A Typical Operating Circuit
Figure 12. ADM242 Typical Operating Circuit
REV. 0
–5–
AD [ ANALOG DEVICES ]
