960μA, 6MHz, Rail-to-Rail I/O

SD06

CMOS Operational Amplifier

SG Micro Corp

www.sg-micro.com

9

TYPICAL APPLICATION CIRCUITS

Differential Amplifier

The circuit shown in Figure 4 performs the difference

function. If the resistor ratios are equal (R4/R3 = R2/R1),

then VOUT = (Vp - Vn) × R2/R1 + VREF.

Vn

Vp

VOUT

VREF

R1

R2

R3

R4

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Figure 4. Differential Amplifier

Instrumentation Amplifier

The circuit in Figure 5 performs the same function as

that in Figure 4 but with a high input impedance.

Vn

Vp

VREF

R1

R2

R3

R4

VOUT

SD06

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SD06

1 2

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Figure 5. Instrumentation Amplifier

Low-Pass Active Filter

The low-pass filter shown in Figure 6 has a DC gain of

(-R2/R1) and the -3dB corner frequency is 1/2R2C.

Make sure the filter bandwidth is 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 resistor values as low as

possible

and

consistent

with

output

loading

consideration.

VIN

VOUT

R1

R2

R3 = R1 // R2

C

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Figure 6. Low-Pass Active Filter