The OPAx323 achieves excellent DC and AC CMRR performance. The device is designed to have a DC CMRR performance at two supply voltages (5.5V and 1.8V) for the entire operating temperature range (–40°C to 125°C). DC CMRR is specified for common-mode beyond rails over a input voltage range of (V–) – 0.2V ≤ V_CM ≤ (V+) + 0.15V for 5.5V operation and (V–) – 0.1V ≤ V_CM ≤ (V+) + 0.05V for 1.8V operation. AC CMRR is shown in Typical Characteristics and is subject to the routing of input traces on the PCB board. For good performance, maintain a short and symmetrical input trace for the two amplifier input terminals.