VSUP+

+

VOUT

RF

VIN

RI

VSUP-

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12

TLV369, TLV2369

SBOS757 – MAY 2016

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Copyright © 2016, Texas Instruments Incorporated

8 Application and Implementation

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.

8.1 Application Information

When designing for ultra-low power, choose system components carefully. To minimize current consumption,

select large-value resistors. Any resistors can react with stray capacitance in the circuit and the input capacitance

of the operational amplifier. These parasitic RC combinations can affect the stability of the overall system. Use of

a feedback capacitor assures stability and limits overshoot or gain peaking.

8.2 Typical Application

A typical application for an operational amplifier is an inverting amplifier, as shown in Figure 15. An inverting

amplifier takes a positive voltage on the input and outputs a signal inverted to the input, making a negative

voltage of the same magnitude. In the same manner, the amplifier also makes negative input voltages positive on

the output. In addition, amplification can be added by selecting the input resistor RI and the feedback resistor RF.

Figure 15. Application Schematic

8.2.1 Design Requirements

The supply voltage must be chosen to be larger than the input voltage range and the desired output range. The

limits of the input common-mode range (VCM) and the output voltage swing to the rails (VO) must also be

considered. For instance, this application scales a signal of ±0.5 V (1 V) to ±1.8 V (3.6 V). Setting the supply at

±2.5 V is sufficient to accommodate this application.