BU7245SHFV 데이터 시트보기 (PDF) - ROHM Semiconductor

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BU7245SHFV

Ultra Low Power CMOS Operational Amplifiers

ROHM Semiconductor 

BU7265G,BU7265SG,BU7205HFV,BU7205SHFV,BU7271G,BU7271SG,BU7245HFV,BU7245SHFV,

BU7411G,BU7411SG,BU7421G,BU7421SG,BU7475HFV,BU7475SHFV

●Examples of circuit

○Voltage follower

Technical Note

VDD

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

Vout=Vin

Vin

VSS

Fig.167 voltage follower circuit

○Inverting amplifier

R1

Vin

R2

VDD

R1//R2

VSS

Vout

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.

Fig.168 Inverting amplifier circuit

○Non-inverting amplifier

R1

R2

VDD

Vin

Vout

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

Fig.169 Non-inverting amplifier circuit

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2010.12 - Rev.A

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