SGM8531/8532/8534

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Typical Application Circuits

Differential Amplifier

The circuit shown in Figure 4 performs the difference function.

If the resistors ratios are equal ( R4 / R3 = R2 / R1 ), then

Vn

Vp

SGM8531

Vref

R1

R2

R3

R4

Figure 4. Differential Amplifier

Instrumentation Amplifier

The circuit in Figure 5 performs the same function as that in Figure

4 but with the high input impedance.

Vn

Vp

SGM8531

Vref

R1

R2

R3

R4

SGM8531

SGM8531

Figure 5. Instrumentation Amplifier

Low Pass Active Filter

and the –3dB corner frequency is 1/2

within the bandwidth of the amplifier. The Large values of feedback

resistors can couple with parasitic capacitance and cause

undesired effects such as ringing or oscillation in high-speed

amplifiers. Keep resistors value as low as possible and consistent

with output loading consideration.

SGM8531

R1

R2

R3 = R1 // R2

C

Figure 6. Low Pass Active Filter