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| SGM8651 Datasheet, PDF (9/17 Pages) SG Micro Corp – 50MHz, Rail-to-Rail Output CMOS Operational Amplifier | |||
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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 â Vn ) Ã R2 / R1 + Vref.
R2
R1
Vn
Vp
R3
SGM8651
R4
Vref
VOUT
Figure 4. Differential Amplifier
R1
VIN
C
R2
SGM8651
VOUT
R3 = R1 // R2
Figure 6. Low Pass Active Filter
Driving Video
The SGM865x can be used in video applications like in Figure 7.
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in
Figure 4 but with the high input impedance.
SGM8651
Vn
Vp
SGM8651
R2
R1
SGM8651
R3
R4
VOUT
VIN
SGM8651
RF
RG
75Ω
75Ω
CABLE
VOUT
75Ω
G = 1 + RF / RG
Figure 7. Typical Video Driving
Vref
Figure 5. Instrumentation Amplifier
Low Pass Active Filter
The low pass filter shown in Figure 6 has a DC gain of (-R2/R1)
and the â3dB corner frequency is 1/2ÏR2C. Make sure the filter
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 resistors value as low as possible
and consistent with output loading consideration.
ï¼
SGM8651/2/3/4/5
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