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12

OPA2863

SBOS982A – JUNE 2020 – REVISED JUNE 2020

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Copyright © 2020, Texas Instruments Incorporated

Device Functional Modes (continued)

8.4.3 Single-Supply Operation (2.7 V to 12.6 V)

Many newer systems use a single power supply to improve efficiency and reduce the cost of the extra power

supply. The OPAx863 devices can be used with a single supply (with the negative supply set to ground) with no

change in performance if the input and output are biased within the linear operation of the device. To change the

circuit from split supply to a balanced, single-supply configuration, level shift all voltages by half the difference

between the power-supply rails. An additional advantage of configuring an amplifier for single-supply operation is

that the effects of PSRR are minimized because the low-supply rail is grounded. See the Single-Supply Op Amp

Design Techniques application report for examples of single-supply designs.

9 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.

9.1 Application Information

9.1.1 Amplifier Gain Configurations

The OPAx863 devices are classic voltage-feedback amplifiers with each channel having two high-impedance

inputs and a low-impedance output. Standard application circuits (as shown in Figure 8 and Figure 9) include the

noninverting and inverting gain configurations. The DC operating point for each configuration is level-shifted by

the reference voltage VREF that is typically set to midsupply in single-supply operation. VREF is often connected

to ground in split-supply applications.

Figure 8. Noninverting Amplifier

Figure 9. Inverting Amplifier

Figure 11 shows the closed-loop gain of an amplifier in a noninverting configuration.

shows the closed-loop gain of an amplifier in an inverting configuration.