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| SGM8624_15 Datasheet, PDF (10/19 Pages) SG Micro Corp – Rail-to-Rail I/O CMOS Operational Amplifiers | |||
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SGM8621/2/3/4
250μA, 3MHz, 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 resistors ratios are equal (R4/R3 = R2/R1),
then VOUT = (Vp - Vn) Ã R2/R1 + VREF.
R2
R1
Vn
Vp
R3
SGM8621
R4
VREF
VOUT
Figure 4. Differential 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 1/2ï°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
SGM8621
VOUT
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in
Figure 4 but with a high input impedance.
R3=R1//R2
Figure 6. Low Pass Active Filter
SGM8621
Vn
Vp
SGM8621
R2
R1
SGM8621
R3
R4
VOUT
VREF
Figure 5. Instrumentation Amplifier
SG Micro Corp
10
www.sg-micro.com
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