bu7462snux ROHM Co. Ltd., bu7462snux Datasheet - Page 31

• Manufacturer Part Number: bu7462snux
• Description: Ground Sense Low Voltage Operation Cmos Operational Amplifiers
• Manufacturer: ROHM Co. Ltd.

BU7461/BU7461S family, BU7441/BU7441S family, BU7462/BU7462S family, BU7442/BU7442S family
BU7464/BU7464S family, BU7444/BU7444S family, BU7465/BU7465S family, BU7445/BU7445S family
●Examples of circuit
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Vin2
○Adder circuit
○Differential amplifier
Vin1
Vin2
Vin1
R1
R3
R1
R2
Fig.193 Adder circuit
Fig.194 Differential amplifier
R4
R2
R3
VDD
VDD
VSS
VSS
31/36
Vout
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.
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)
Technical Note
2010.12 - Rev.A