BU7241G_14 Datasheet, PDF (31/48 Pages) Rohm – CMOS Operational Amplifiers

BU7241G BU7241SG BU7242xxx BU7242Sxxx BU7244xx BU7244Sxx ^Datasheet
Examples of Circuit
○Voltage Follower
VDD
OUT
IN
VSS
Figure 75. Voltage Follower Circuit
○Inverting Amplifier
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
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 76. Inverting Amplifier Circuit
○Non-inverting Amplifier
R1
R2
VDD
OUT
IN
VSS
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.
Figure 77. Non-inverting Amplifier Circuit
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03.Dec.2014 Rev.003