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
VCC
R
Vin(+) +
+V2
100k
100k
HA17902
–
R
100k
+V3
R
+V4
100k
Vin(–)
R
100 k
Vout
Figure 2 Summing Amplifier
Rev.1.00 Jun 15, 2005 page 8 of 10