ADM231L–ADM234L/ADM236L–ADM241L
TYPICAL OPERATING CIRCUITS
+5V INPUT
+5V INPUT
1µF
13
V
CC
V
CC
+7.5V TO +13.2V
14
3
V+
V–
T1
T2
T1
T2
T1
T2
IN
IN
OUT
OUT
1
2
C1+
C1–
1µF
+16V
RS-232
OUTPUTS
TTL/CMOS
INPUTS
+12V TO –12V
VOLTAGE
INVERTER
1
1µF
+16V
R1
R1
R2
T1
IN
T1
R1
R2
8
7
9
6
11
4
T1
T2
R1
R2
OUT
OUT
IN
OUT
TTL/CMOS
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
RS-232
OUTPUTS
2
1
R2
T2
IN
T2
R1
R2
IN
OUT
C1+
C1–
V–
C2+
C2+
R1
DO NOT MAKE
CONNECTIONS TO
THESE PINS
10
5
OUT
IN
TTL/CMOS
OUTPUTS
RS-232
INPUTS
2
R2
OUT
IN
ADM233L
C2–
C2–
INTERNAL
–10V POWER
SUPPLY
GND
12
ADM231L
V–
V+
INTERNAL
+10V POWER
SUPPLY
1
2
GND
GND
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
2
Figure 17. ADM231L Typical Operating Circuit (PDIP Pinout)
Figure 19. ADM233L Typical Operating Circuit
5V INPUT
5V INPUT
V
C1+
C1–
+5V TO +10V
VOLTAGE
DOUBLER
CC
1µF
+6.3V
1µF
1µF
+6.3V
1µF
+6.3V
V
C1+
C1–
+5V TO +10V
VOLTAGE
DOUBLER
CC
+6.3V
1µF
+6.3V
1µF
V+
V–
+6.3V
V+
V–
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
1µF
+16V
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
1µF
+16V
1µF
+16V
1µF
+16V
T1
T1
T1
T2
R1
R2
IN
OUT
TTL/CMOS
INPUTS
T1
IN
T1
RS-232
OUTPUTS
T1
T2
OUT
1
T2
IN
T2
OUT
T2
IN
T2
OUT
TTL/CMOS
1
R1
R1
IN
INPUTS
OUT
RS-232
OUTPUTS
T3
T4
IN
IN
T3
T4
T3
RS-232
INPUTS
TTL/CMOS
OUTPUTS
OUT
2
R2
R2
IN
OUT
T4
OUT
GND
ADM232L
GND
ADM234L
1
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2
Figure 20. ADM234L Typical Operating Circuit
Figure 18. ADM232L Typical Operating Circuit
Rev. C | Page 9 of 20
ROCHESTER [ Rochester Electronics ]
