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 9-1 and Figure 9-2) 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.
Equation 1 shows the closed-loop gain of an amplifier in a noninverting configuration.
Equation 1 shows the closed-loop gain of an amplifier in an inverting configuration.