 English |
|
|
|
|
|
|
|
| SGM321_17 Datasheet, PDF (9/18 Pages) SG Micro Corp – CMOS Operational Amplifiers | |||
| |||
| ◁ |
SGM321/SGM358/SGM324
1MHz, 60μA, 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 to (R4/R3 = R2/R1),
then VOUT = (Vp - Vn) Ã R2 / R1 + VREF.
R2
R1
Vn
Vp
R3
SGM321
R4
VREF
VOUT
Figure 4. Differential Amplifier
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as
that in Figure 4 but with a high input impedance.
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 1/2ÏR2C.
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
SGM321
VOUT
R3 = R1 // R2
SGM321
Vn
R2
R1
SGM321
VOUT
Figure 6. Low-Pass Active Filter
Vp
R3
SGM321
R4
VREF
Figure 5. Instrumentation Amplifier
SG Micro Corp
www.sg-micro.com
MARCH 2017
9
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese