BU7294F datasheet(21/30 Pages) ROHM

21 / 30 page

Datasheet

www.rohm.com

TSZ02201-0RAR1G200390-1-2

21/27

22.May.2013 Rev.001

TSZ22111･15･001

BU7291G, BU7291SG, BU7294xx, BU7294Sxx

●Application example

○Voltage follower

○Inverting amplifier

○Non-inverting amplifier

Figure 53. Inverting amplifier circuit

Figure 54. Non-inverting amplifier circuit

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.

Figure 52. Voltage follower

VSS

OUT

VDD

VSS

VDD

OUT

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

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