BU5281G Datasheet, PDF (14/22 Pages) Rohm – Low Input Offset Voltage Ground Sense CMOS Operational Amplifiers

BU5281G BU5281SG
Examples of Circuit
○Voltage Follower
Datasheet
VDD
OUT
IN
VSS
Figure 28. Voltage Follower Circuit
Voltage gain is 0dB.
Using this circuit, the output voltage (OUT) is configured
to be equal to the input voltage (IN). This circuit also
stabilizes the output voltage (OUT) due to high input
impedance and low output impedance. Computation for
output voltage (OUT) is shown below.
OUT=IN
○Inverting Amplifier
R1
IN
R2
VDD
VSS
OUT
For inverting amplifier, input voltage (IN) is amplified by
a voltage gain and depends on the ratio of R1 and R2.
The out-of-phase output voltage is shown in the next
expression
OUT=-(R2/R1)・IN
This circuit has input impedance equal to R1.
Figure 29. Inverting Amplifier Circuit
○Non-inverting Amplifier
R1
R2
VDD
OUT
IN
VSS
Figure 30. Non-inverting Amplifier Circuit
For non-inverting amplifier, input voltage (IN) is amplified
by a voltage gain, which depends on the ratio of R1 and
R2. The output voltage (OUT) is in-phase with the input
voltage (IN) and is shown in the next expression.
OUT=(1 + R2/R1)・IN
Effectively, this circuit has high input impedance since its
input side is the same as that of the operational
amplifier.
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