The power up for the negative range is similar to the positive range, but the outputs are tied to the VSS voltage during start-up. Figure 4-2 shows the start-up behavior. This means that during start-up there is a period where the outputs are within the on range of the PA. Because the PA can possibly be powered, the PA should be isolated from PAVDD so the PA does not erroneously turn on.

Figure 4-2 AFE20408 Negative Startup