BU7294F Datasheet, PDF (21/30 Pages) Rohm – Input/Output Full Swing High Slew Rate Low Voltage CMOS Operational Amplifiers

BU7291G, BU7291SG, BU7294xx, BU7294Sxx
●Application example
○Voltage follower
Datasheet
VDD
OUT
IN
VSS
Figure 52. Voltage follower
○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
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 53. Inverting amplifier circuit
○Non-inverting amplifier
R1
R2
VDD
OUT
IN
VSS
Figure 54. 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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22.May.2013 Rev.001