BA4580RF datasheet(46/49 Pages) ROHM

46 / 49 page

Technical Note

46/48

BA4558F,BA4558R F/FV/FVM,BA4560F,BA4560RF/FV/FVM,BA4564RFVBA4580RF/FVM,BA4584FV,

BA4584RF/FV,BA8522RF/FV/FVM,BA15218F,BA14741F,BA15532F,BA4510F/FV,BA2115F/FVM

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2011.08 - Rev.B

○

Voltage follower

○

Inverting amplifier

○

Non-inverting amplifier

Fig. 323 Voltage follower circuit

Fig. 324 Inverting amplifier circuit

Fig. 325 Non-inverting amplifier circuit

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, Vi(b) Derating curve

voltage gain decided R1 and R2, and phase reversed

voltage is outputted.

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.

VSS

Vout

Vin

VDD

VSS

R1//R2

Vin

Vout

VDD

VSS

VDD

Vin

Vout

BA4580RF Datasheet(PDF) 46 Page - Rohm

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