ADM231L–ADM234L/ADM236L–ADM241L
TYPICAL OPERATING CIRCUITS
+5V INPUT
1µF
+5V INPUT
13
V
CC
1µF
+16V
1
V
CC
V+
14
V–
3
+7.5V TO +13.2V
C1+
+12V TO –12V
VOLTAGE
INVERTER
T1
IN
TTL/CMOS
INPUTS
1
T2
IN
R1
OUT
T1
T1
OUT
RS-232
OUTPUTS
T2
OUT
R1
IN
RS-232
INPUTS
2
R2
IN
C2+
C2+
2
C1–
1µF
+16V
T1
OUT
RS-232
OUTPUTS
T2
T1
IN
TTL/CMOS
INPUTS
1
T2
IN
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
8
T1
11
R1
TTL/CMOS
OUTPUTS
R2
OUT
DO NOT MAKE
CONNECTIONS TO
THESE PINS
INTERNAL
–10V POWER
SUPPLY
00070-0-005
7
T2
4
T2
OUT
R1
IN
R2
IN
RS-232
INPUTS
2
R2
C1+
C1–
9
R1
10
6
R2
GND
12
5
ADM233L
V–
V–
V+
GND
GND
C2–
C2–
ADM231L
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
INTERNAL
+10V POWER
SUPPLY
1
INTERNAL
2
INTERNAL
400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 17. ADM231L Typical Operating Circuit (PDIP Pinout)
Figure 19. ADM233L Typical Operating Circuit
5V INPUT
C1+
C1–
C2+
C2–
V
CC
V+
5V INPUT
1µF
+6.3V
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
1µF
+6.3V
1µF
+6.3V
1µF
+6.3V
C1+
C1–
C2+
C2–
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
V
CC
V+
1µF
+6.3V
1µF
+6.3V
1µF
+16V
V–
1µF
+16V
T1
OUT
RS-232
OUTPUTS
1µF
+16V
V–
1µF
+16V
T1
OUT
T2
OUT
RS-232
OUTPUTS
TTL/CMOS
INPUTS
1
T1
IN
T2
IN
R1
OUT
T1
T1
IN
T2
IN
TTL/CMOS
INPUTS
1
T3
IN
T4
IN
GND
00070-0-007
T1
T2
T2
OUT
R1
IN
RS-232
INPUTS
2
R2
IN
T2
R1
TTL/CMOS
OUTPUTS
R2
OUT
GND
R2
T3
T3
OUT
T4
OUT
T4
ADM232L
ADM234L
00070-0-011
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
Figure 18. ADM232L Typical Operating Circuit
Figure 20. ADM234L Typical Operating Circuit
Rev. C | Page 9 of 20
00070-0-009
AD [ ANALOG DEVICES ]
