Many newer systems use a single power supply to improve efficiency and reduce the cost of the extra power supply. The OPA862 can be used with a single supply (negative supply set to ground), as shown in Figure 7-4, 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 single-supply configuration, level shift all the voltages by half the difference between the power-supply rails. In the single-supply configuration, a voltage must be set on the VREF pin, typically midsupply, such that VREF does not violate the common-mode input range (CMIR) specification or the output voltage range of A2. 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.

Figure 7-4 Typical Single-Supply Configuration