SPRADA5 April 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
Figure 1-1 shows the block diagram of the PGA module. The active component in the PGA is an embedded op-amp that can be configured as a non-inverting or inverting amplifier with internal feedback resistors. These internal feedback resistor values are paired to produce software-selectable voltage gains. Bringing these gain resistors internal to the device increases matching and temperature drift stability compared to the typical external gain-setting resistors.
Three PGA signals are available at the device pins:
Please note that PGA_OUT_INT is an internal signal at the op-amp output, which is available for sampling and monitoring by the internal ADC and CMPSS modules.
Analog pins and internal connection for the device are given in the Analog Subsystem chapter of the Technical Reference Manual.