PGA460-Q1: PGA460Q-1

Dixit,
Yes, the PGA460 will work with a 7.5V supply at VPWR, and its UART is compatible with 5V logic levels. By the default, the UART is configured for 3.3V logic levels, so you'll need to place a 100kOhm pull-up resistor to 5V at the TEST pin to enable the 5V logic level.

Here is the excerpt from the datasheet describing this process:

The digital voltage-level selection performed by the TEST pin is executed at device power up. On power-up, the
device checks the level of the TEST pin. If the level is low, the digital output pins operate at 3.3 V. If the TEST
pin is tied high (3.3 V or 5 V are both considered high state), the digital output pins operate at a 5 V. This
condition is latched in the PGA460-Q1 device so that the test mux can further use the TEST pin as previously
described. If the application requires that a 5-V digital output is used and a test mux output must be extracted
from the PGA460-Q1 device, then a weak pullup resistor on the TEST pin can be connected as shown in
Figure 40.
As shown in Figure 40, the resistor (RPU) is connected to a permanent power supply and a current path to
ground is generated through the RPU resistor and the 800-kΩ internal resistance. This configuration is no problem
for the system; however, it might cause a small quiescent-current increase in applications that require the use of
the PGA460-Q1 low-power mode to preserve energy. In this case, the TEST pin can be connected to a GPIO pin
on the external MCU that can output a logic low or high state on the TEST pin to select the voltage level at
device start-up and later disable the GPIO output to preserve energy or reconfigure the GPIO as an input in case
the MCU uses any of the PGA460-Q1 test output signals. The external pullup resistor is only required for CMOS
5-V UART communication and is not required for 3-V communication.