BU7255HFV-TR Datasheet, PDF (13/22 Pages) Rohm – Input/Output Full Swing Low Voltage Operation High Speed CMOS Operational Amplifiers

BU7255HFV BU7255SHFV
Examples of Circuit
○Voltage Follower
VDD
OUT
IN
VSS
Figure 27. Voltage Follower Circuit
○Inverting Amplifier
R1
IN
R2
VDD
OUT
VSS
Figure 28. Inverting Amplifier Circuit
○Non-inverting Amplifier
R1
R2
VDD
OUT
IN
VSS
Figure 29. Non-inverting Amplifier Circuit
Datasheet
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.
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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