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| SGM8541_15 Datasheet, PDF (8/17 Pages) SG Micro Corp – CMOS Operational Amplifiers | |||
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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
= (Vp - Vn) Ã R2/R1 + VREF.
VOUT
R2
R1
Vn
Vp
R3
SGM8541
R4
VREF
VOUT
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 1/2ï°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.
R1
VIN
C
R2
SGM8541
VOUT
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.
R2
R1
SGM8541
Vn
SGM8541
VOUT
Vp
R3
R4
SGM8541
VREF
Figure 5. Instrumentation Amplifier
R3 = R1 // R2
Figure 6. Low Pass Active Filter
SG Micro Corp
8
www.sg-micro.com
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