HA17902 Datasheet, PDF (11/14 Pages) Hitachi Semiconductor – Quad Operational Amplifier

HA17902 Series
HA17902 Application Examples
The HA17902 is a quad operational amplifier, and consists of four operational amplifier circuits and one
bias current circuit. It features single-voltage power supply operation, internal phase compensation, a wide
zero-cross bandwidth, a low input bias current, and a high open-loop gain. Thus the HA17902 can be used
in a wide range of applications. This section describes several applications using the HA17902.
1. Noninverting Amplifier
Figure 1 shows the circuit diagram for a noninverting amplifier. The voltage gain of this amplifier is
given by the following formula.
Vout _{= 1 +} R2
Vin
R1
+Vin
10k
+
–
R₂
1M
10k R₁
Vout
Figure 1 Noninverting Amplifier
2. Summing Amplifier
Since the circuit shown in figure 2 applies +V₁ and +V₂ to the noninverting input and +V₃ and +V₄ to
the inverting input, the total output will be Vout = V₁ + V₂ – V₃ – V₄.
R
100k
+V₁
V_CC
R
Vin(+) ₊
+V₂
100k
100k
HA17902
–
R
100k
+V₃
R
+V₄
100k
Vin(–)
R
100 k
Vout
Figure 2 Summing Amplifier
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