SGM8061 Datasheet, PDF (10/14 Pages) SG Micro Corp – 500MHz, Rail-to-Rail Output CMOS Operational Amplifier

Typical Application Circuits
Differential Amplifier
The circuit shown in Figure 3 performs the difference function.
If the resistors ratios are equal ( R4 / R3 = R2 / R1 ), then
VOUT = ( Vp – Vn ) × R2 / R1 + Vref.
R2
R1
Vn
Vp
R3
SGM8061
R4
Vref
V_OUT
Driving Video
The SGM806x can be used in video applications like in Figure 5.
V_IN
SGM8061
R_F
R_G
75Ω
75Ω
CABLE
V_OUT
75Ω
G = 1 + R_F / R_G
Figure 5. Typical Video Driving
Figure 3. Differential Amplifier
Low Pass Active Filter
The low pass filter shown in Figure 4 has a DC gain of ( - R2 / R1 )
and the –3dB corner frequency is 1/2πR2C. 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.
R1
V_IN
C
R2
SGM8061
V_OUT
R3 = R1 // R2
Figure 4. Low Pass Active Filter
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