TL071_16 Datasheet, PDF (15/51 Pages) Texas Instruments – Low-Noise JFET-Input Operational Amplifiers

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9 Application and Implementation
TL071, TL071A, TL071B
TL072, TL072A, TL072B, TL074, TL074A, TL074B
SLOS080M – SEPTEMBER 1978 – REVISED JUNE 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
A typical application for an operational amplifier is an inverting amplifier. This amplifier takes a positive voltage on
the input, and makes it a negative voltage of the same magnitude. In the same manner, it also makes negative
voltages positive.
9.2 Typical Application
RF
RI
Vsup+
VOUT
+
VIN
Vsup-
Figure 23. Inverting Amplifier
9.2.1 Design Requirements
The supply voltage must be chosen such that it is larger than the input voltage range and output range. For
instance, this application will scale a signal of ±0.5 V to ±1.8 V. Setting the supply at ±12 V is sufficient to
accommodate this application.
9.2.2 Detailed Design Procedure
Determine the gain required by the inverting amplifier:
VOUT
AV =
VIN
(1)
1.8
AV = _-0.5 = -3.6
(2)
Once the desired gain is determined, choose a value for RI or RF. Choosing a value in the kilohm range is
desirable because the amplifier circuit will use currents in the milliamp range. This ensures the part will not draw
too much current. This example will choose 10 kΩ for RI which means 36 kΩ will be used for RF. This was
determined by Equation 3.
AV =
RF
- _RI
(3)
Copyright © 1978–2015, Texas Instruments Incorporated
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