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| SGM8634_15 Datasheet, PDF (11/20 Pages) SG Micro Corp – Rail-to-Rail I/O CMOS Operational Amplifiers | |||
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SGM8631/2/3/4
470μA, 6MHz, Rail-to-Rail I/O
CMOS Operational Amplifiers
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) Ã R2/R1 + VREF.
R2
R1
Vn
Vp
R3
SGM8631
R4
VOUT
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
VREF
Figure 4. Differential Amplifier
SGM8631
VOUT
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that
in Figure 4 but with a high input impedance.
SGM8631
Vn
R2
R1
SGM8631
VOUT
R3 = R1 // R2
Figure 6. Low Pass Active Filter
Vp
R3
R4
SGM8631
VREF
Figure 5. Instrumentation Amplifier
SG Micro Corp
11
www.sg-micro.com
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