2.3 Noninverting PGA Mode

Figure 6 shows the SAC noninverting PGA mode. In this mode, signal can be amplified without inverting. This is useful for single-supply amplifier where negative voltage is not allowed. External feedback is not necessary that the internal configurable resistor ladder determines the amplifier gain. There are 8 different gain settings from 1x to 33x.

Figure 6. Smart Analog Combo Noninverting PGA Mode

As the red highlighted part in Figure 6 shows, the signal input can be selected from the positive port OAx+ or a paired OA. The OA negative port must select PGA input (NSEL = 01b), and the PGA MSEL is set to ground (MSEL = 10b).SAC gain is configured by GAIN bits in SACxPGA control register. Example 3 shows one code sequence of configuring SAC into noninverting PGA mode with driver library API functions.