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| SGM8543 Datasheet, PDF (8/12 Pages) SG Micro Corp – Operational Amplifier with Shutdown | |||
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SGM8543
1.1MHz, 48μA, Rail-to-Rail I/O, CMOS
Operational Amplifier with Shutdown
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) Ã R2 / R1 + VREF.
R2
R1
Vn
Vp
R3
DISABLE
SGM8543
R4
VREF
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.
DISABLE
R1
SGM8543
Vn
DISABLE
Vp
R3
SGM8543
R2
DISABLE
SGM8543
VOUT
R4
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
DISABLE
SGM8543
VOUT
R3 = R1 // R2
Figure 6. Low Pass Active Filter
VREF
Figure 5. Instrumentation Amplifier
SG Micro Corp
8
www.sg-micro.com
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