SGM723 Shengbang Microelectronics, SGM723 Datasheet - Page 10

• Manufacturer Part Number: SGM723
• Description: (SGM721 - SGM724) Rail-to-Rail Output CMOS Operational Amplifier
• Manufacturer: Shengbang Microelectronics

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The low pass filter shown in Figure 6 has a DC gain of (-R
and the –3dB corner frequency is 1/2πR
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.
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
V
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in
Figure 4 but with the high input impedance.
Low Pass Active Filter
Vn
Vp
OUT
Vp
Vn
= ( Vp – Vn ) × R
Figure 5. Instrumentation Amplifier
Figure 4. Differential Amplifier
SGM721
SGM721
R1
R3
Vref
R4
2
SGM721
/ R
R2
1
+ Vref.
R1
R3
2
C. Make sure the filter
SGM721
V
OUT
R2
R4
Vref
2
/R
V
1
)
OUT
１０
V
IN
Figure 6. Low Pass Active Filter
R1
R3=R1//R2
R2
SGM721
C
SGM721/2/3/4
V
OUT