BU7461G_10 Datasheet, PDF (31/37 Pages) Rohm – Ground Sense Low Voltage Operation CMOS Operational Amplifiers

BU7461/BU7461S family, BU7441/BU7441S family, BU7462/BU7462S family, BU7442/BU7442S family
BU7464/BU7464S family, BU7444/BU7444S family, BU7465/BU7465S family, BU7445/BU7445S family Technical Note
●Examples of circuit
○Adder circuit
R3
R1
Vin1
Vin2
R2
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.193 Adder circuit
○Differential amplifier
R2
R1
Vin1
R3
Vin2
R4
VDD
VSS
Fig.194 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