SGM8541XC5(2017) データシートの表示（PDF） - Shengbang Microelectronics Co, Ltd

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SGM8541XC5
(Rev.:2017)

1.1MHz, 46μA, Rail-to-Rail I/O CMOS Operational Amplifiers

Shengbang Microelectronics Co, Ltd 

SGM8541/2/4

TYPICAL APPLICATION CIRCUITS

Differential Amplifier

The circuit shown in Figure 4 performs the difference

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

then VOUT = (Vp - Vn) × R2/R1 + VREF.

R2

R1

Vn

Vp

R3

SGM8541

VOUT

R4

VREF

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.

SGM8541

Vn

Vp

SGM8541

R2

R1

SGM8541

R3

R4

VOUT

VREF

Figure 5. Instrumentation Amplifier

1.1MHz, 46μA, Rail-to-Rail I/O

CMOS Operational Amplifiers

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 1/2πR2C.

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.

R1

VIN

C

R2

SGM8541

VOUT

R3 = R1 // R2

Figure 6. Low-Pass Active Filter

SG Micro Corp

www.sg-micro.com

MARCH 2017

9

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