20VS8-202N
P. 2 / 4
EM-4444
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
■
CONNECTION DIAGRAM
3
38
37
20
22
36
1
2
19
18
INPUT V
IN
+
FEEDBACK
COM (–)
NON-INVERTING INPUT
INVERTING INPUT
REFERENCE Volt. SOURCE for INPUT
–
Note. The reference voltage source for input is common to the input COM (–)
+
OUTPUT Vo
+
COM (–)
–
POWER SUPPLY
APPLICATION EXAMPLES
The primary amplifier in this unit is high accurate. Installing external resistors to the inverting input (pin 3) and the feed-
back (pin 4), this unit can be used as a non-inverting or inverting amplifier.
The series resistance of the amplifier, R
1
+ R
2
must be between 10kΩ and 200kΩ.
The output is proportional to the input.
The gain is 1.
E.g. 0 – 5 V DC for 0 – 5 V DC input.
The output is inverted from the input.
The gain is -1.
E.g. 0 V DC for 0 V DC input and -5 V
DC for +5 V DC input.
For a non-inverting amplification, the
output is following.
V
O
= (1 + R
1
/ R
2
)
×
V
IN
When R
1
= 10 kΩ, R
2
= 10 kΩ, then the
output is following. The gain is 2.
V
O
= 2
×
V
IN
38
3
■
2
1
36
37
19
18
15V DC
POWER
20
22
Non-inverting amplifier circuit: Basic example of G = 1
Non-inverting circuit G = 1
REF. Volt. SOURCE for INPUT
INPUT V
IN
OUTPUT Vo
+
–
+
–
+
–
+
–
+
–
38
3
OUTPUT Vo
36
37
19
18
20
22
R
1
R
1
2
1
15V DC
■
Inverting amplifier circuit: Basic example of G = -1 (output is inverted from the input)
Inverting circuit G = -1
REF. Volt. SOURCE for INPUT
INPUT V
IN
+
–
+
–
+
–
+
–
POWER
+
–
–
38
3
OUTPUT Vo
–
−
36
37
18
–
20
22
R
2
R
1
–
2
1
19
15V DC
POWER
■
Non-inverting amplifier circuit: Example of G = 1 + R
1
/ R
2
INPUT V
IN
REF. Volt. SOURCE for INPUT
Non-inverting amplifier circuit G = 1 + R
1
/ R
2
+
+
+
+
+
