LME49721MAX Datasheet, PDF (16/29 Pages) Texas Instruments – LME49721 High-Performance, High-Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier

LME49721
SNAS371C – SEPTEMBER 2007 – REVISED APRIL 2013
V_IN ^R1
V_DD
R₃
V_CM
R₄
R₂
V_DD
-
+
V_OUT
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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.
V_IN R₁
R₂
V_DD
-
V_OUT
+
V_SS
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.
V_DD
-
V_IN
+
V_OUT
Figure 72. Buffer
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