SGM321 SGMICRO [Shengbang Microelectronics Co, Ltd], SGM321 Datasheet - Page 8

• Manufacturer Part Number: SGM321
• Description: 1MHz, 60?A, Rail-to-Rail I/O CMOS Operational Amplifier
• Manufacturer: SGMICRO [Shengbang Microelectronics Co, Ltd]

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
The low pass filter shown in Figure 6 has a DC gain of ( - R
and the –3dB corner frequency is 1/2πR
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.
Vp
Vn
Vp
Vn
OUT
= ( Vp – Vn ) × R
R1
R3
Vref
Figure 5. Instrumentation Amplifier
SGM321
SGM321
Figure 4. Differential Amplifier
R4
SGM321
R2
2
/ R
1
+ Vref.
R1
R3
2
V
C. Make sure the filter is
SGM321
OUT
R2
R4
Vref
V
2
/ R
OUT
1
)
８
V
IN
R1
Figure 6. Low Pass Active Filter
R3 = R1 // R2
R2
SGM321
C
SGM321/358/324
V
OUT