BA2902F datasheet(19/26 Pages) ROHM

19 / 26 page

Technical Note

BA10358F/FV, BA10324AF/FV, BA2904SF/FV/FVM, BA2904F/FV/FVM

BA2902SF/FV/KN, BA2902F/FV/KN, BA3404F/FVM

19/25

www.rohm.com

2011.08 - Rev.B

●

Examples of circuit

○

Voltage follower

○

Inverting amplifier

○

Non-inverting amplifier

Voltage gain is 0 [dB].

This circuit controls output voltage (Vout) equal input

voltage (Vin), and keeps Vout with stable because of

high input impedance and low output impedance.

Vout is shown next formula.

Vout=Vin

For inverting amplifier, Vin is amplified by voltage gain

decided R1 and R2, and phase reversed voltage is

outputed.

Vout is shown next formula.

Vout=-(R2/R1)・Vin

Input impedance is R1.

For non-inverting amplifier, Vin is amplified by voltage

gain decided R1 and R2, and phase is same with Vin.

Vout is shown next formula.

Vout=(1+R2/R1)・Vin

This circuit realizes high input impedance because

Input impedance is operational amplifier’s input

Impedance.

VEE

Vout

Vin

VCC

VEE

R1//R2

Vin

Vout

VCC

VEE

VCC

Vin

Vout

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