BU7265G_1012 Datasheet, PDF (24/29 Pages) Rohm – Ultra Low Power CMOS Operational Amplifiers

BU7265G,BU7265SG,BU7205HFV,BU7205SHFV,BU7271G,BU7271SG,BU7245HFV,BU7245SHFV,
BU7411G,BU7411SG,BU7421G,BU7421SG,BU7475HFV,BU7475SHFV
Technical Note
●Examples of circuit
○Adder circuit
R3
R1
Vin1
R2
Vin2
VDD
VSS
Vout
Adder circuit output the voltage that added up Input
voltage. A phase of the output voltage turns orver,
because non-inverting circuit is used.
Vout is shown next formula.
Vout = -R3(Vin1/R1+Vin2/R2)
When three input voltage is as above, it connects
with input through resistance like R1 and R2.
Fig.170 Adder circuit
○Differential amplifier
Vin1
R1
Vin2
R3
R2
VDD
R4
VSS
Fig.171 Differential amplifier
Vout
Differential amplifier output the voltage that amplified
a difference of input voltage.
In the case of R1=R3=Ra、R2=R4=Rb
Vout is shown next formula.
Vout = -Rb/Ra(Vin1-Vin2)
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2010.12 - Rev.A