sgm8545 sg-micro, sgm8545 Datasheet - Page 8

• Manufacturer Part Number: sgm8545
• Description: 1.1mhz, 42?a, Rail-to-rail I/o Cmos Operational Amplifier
• Manufacturer: sg-micro

SGM8545
TYPICAL APPLICATION CIRCUITS
Differential Amplifier
The circuit shown in Figure 4 performs the difference function. If
the resistors ratios are equal ( R
V
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in Figure 4
but with the high input impedance.
Vn
Vp
OUT
Vp
Vn
= ( Vp – Vn ) × R
SGM8545
SGM8545
Figure 5. Instrumentation Amplifier
V
R
R
SG Micro Limited
www.sg-micro.com
REF
Figure 4. Differential Amplifier
1
3
2
/ R
R
1
+ V
SGM8545
4
R
R
REF
R
3
1
4
/ R
.
2
3
= R
SGM8545
2
/ R
R
R
2
1
4
), then
V
V
OUT
REF
V
OUT
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.
V
IN
CMOS Operational Amplifier
1.1MHz, 42µA, Rail-to-Rail I/O
Figure 6. Low Pass Active Filter
R
1
R
SGM8545
3
R
= R
2
1
C
// R
2
C. Make sure the filter is
2
V
OUT
2
/ R
1
8
)