ASM202E/ASM±±8±A
ꢂIN CONFIGURATION ANS FUNCTION SEꢁCRIꢂTIONꢁ
C1+
V
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
CC
V+
GND
T1
C1–
C2+
C2–
V–
ADM202E
ADM1181A
OUT
R1
IN
TOP VIEW
(Not to Scale)
R1
T1
OUT
IN
IN
T2
T2
OUT
R2
R2
IN
OUT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
Description
16
2
6
15
1, 3
VCC
V+
V−
GND
Power Supply Input: 5 V ± 10ꢀ.
Internally Generated Positive Supply (+± V nominal).
Internally Generated Negative Supply (−± V nominal).
Ground Pin. Must be connected to 0 V.
External Capacitor 1 is connected between these pins. A 0.1 µF capacitor is recommended, but larger
capacitors of up to 47 µF can be used.
C1+, C1−
4, 5
C2+, C2−
External Capacitor 2 is connected between these pins. A 0.1 µF capacitor is recommended, but larger
capacitors of up to 47 µF can be used.
10, 11
7, 14
8, 13
TIN
TOUT
RIN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels.
Transmitter (Driver) Outputs. These are RS-232 signal levels (typically ±± V).
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is
connected on each input.
±, 12
ROUT
Receiver Outputs. These are CMOS output logic levels.
5V INPUT
5V INPUT
16
CC
+5V TO +10V
VOLTAGE
DOUBLER
+5V TO +10V
VOLTAGE
DOUBLER
1
3
16
1
3
C1+
C1–
V
CC
V
C1+
C1–
0.1µF
10V
0.1µF
10V
C3
C5
0.1µF
10V
C5
0.1µF
2
6
2
V+
0.1µF
6.3V
V+
V–
C3
0.1µF
10V
+10V TO –10V
VOLTAGE
INVERTER
4
5
V–
+10V TO –10V
VOLTAGE
INVERTER
C2+
C2–
4
5
6
0.1µF
10V
C2+
C2–
0.1µF
10V
C4
C4
0.1µF
10V
0.1µF
10V
14
7
14
7
11
10
12
T1
T2
11
10
12
T1
T2
T1
T1
T1
T1
OUT
IN
IN
OUT
EIA/TIA-232
OUTPUTS
EIA/TIA-232
OUTPUTS
CMOS
INPUTS
CMOS
INPUTS
T2
T2
R1
R2
T2
IN
T2
IN
OUT
OUT
R1
R2
13
8
13
8
R1
R2
R1
R2
R1
R2
R1
IN
IN
IN
OUT
OUT
OUT
OUT
EIA/TIA-232
CMOS
OUTPUTS
EIA/TIA-232
CMOS
OUTPUTS
INPUTS
*
INPUTS
*
9
9
R2
IN
ADM1181A
ADM202E
GND
15
GND
15
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 4. ADM202E Typical Operating Circuit
Figure 5. ADM1181A Typical Operating Circuit
Rev. C | Page 5 of 16
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