Datasheet

+
-
V
IN
V
DD
V
OUT
+
-
R
1
R
2
V
OUT
V
IN
V
DD
V
SS
+
-
V
DD
R
1
R
2
V
OUT
V
IN
V
CM
R
3
R
4
V
DD
LME49721
SNAS371C –SEPTEMBER 2007–REVISED APRIL 2013 www.ti.com
Figure 70. Single-Supply Inverting Op Amp
Figure 71 shows the typical connection for a dual supply inverting amplifier. The output voltage is centered on
zero.
Figure 71. Dual-Supply Inverting Op Amp
Figure 72 shows the typical connection for the Buffer Amplifier or also called a Voltage Follower. A Buffer
Amplifier can be used to solve impedance matching problems, to reduce power consumption in the source, or to
drive heavy loads. The input impedance of the op amp is very high. Therefore, the input of the op amp does not
load down the source. The output impedance on the other hand is very low. It allows the load to either supply or
absorb energy to a circuit while a secondary voltage source dissipates energy from a circuit. The Buffer is a unity
stable amplifier, 1V/V. Although the feedback loop is tied from the output of the amplifier to the inverting input,
the gain is still positive. Note: if a positive feedback is used, the amplifier will most likely drive to either rail at the
output.
Figure 72. Buffer
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