ADM231L–ADM234L/ADM236L–ADM241L
+5V INPUT
+5V INPUT
V
C1+
C1–
CC
V
+5V TO +10V
VOLTAGE
DOUBLER
C1+
C1–
CC
+5V TO +10V
VOLTAGE
DOUBLER
1µF
1µF
+6.3V
1µF
+6.3V
1µF
+6.3V
1µF
+6.3V
1µF
+6.3V
+6.3V
V+
V–
V+
V–
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
1µF
+16V
1µF
+16V
1µF
+16V
1µF
+16V
T1
IN
T1
T1
T2
OUT
T1
IN
T1
T1
T2
OUT
T2
IN
T2
OUT
T2
IN
T2
T3
T4
OUT
OUT
OUT
TTL/CMOS
INPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
1
RS-232
OUTPUTS
1
T3
IN
T3
T3
T4
R1
R2
T3
IN
OUT
T3
T4
T4
IN
T4
T4
IN
OUT
R1
R1
IN
OUT
OUT
R1
R1
R2
R1
R2
OUT
IN
IN
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R2
R3
R2
IN
2
R2
OUT
RS-232
TTL/CMOS
OUTPUTS
2
INPUTS
R3
IN
R3
OUT
EN
R3
R3
R3
R4
OUT
IN
IN
SD
R4
GND
ADM236L
R4
OUT
GND
ADM238L
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
2
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
2
Figure 23. ADM238L Typical Operating Circuit
Figure 21. ADM236L Typical Operating Circuit
+5V INPUT
V
C1+
C1–
+5V TO +10V
VOLTAGE
DOUBLER
CC
1µF
1µF
+6.3V
1µF
+6.3V
+6.3V
V+
V–
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
1µF
+16V
1µF
+16V
T1
IN
T1
T1
T2
OUT
T2
IN
T2
OUT
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T3
IN
T3
T3
T4
OUT
1
T4
IN
T4
OUT
T5
IN
20
T5
R1
T5
OUT
R1
R1
IN
OUT
OUT
OUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R2
R3
R2
IN
R2
2
R3
IN
R3
GND
ADM237L
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
2
Figure 22. ADM237L Typical Operating Circuit
Rev. C | Page 10 of 20
ROCHESTER [ Rochester Electronics ]
