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