SPRUJ53C April 2024 – February 2025 TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1
Gain values of PGA are software-selectable using the PGACTL[GAIN] register field. The gain of the PGA in the subtractor and non-inverting modes is determined by a preset ratio between resistors Ria and Rib.
The target values for the gain resistors for subtractor and non-inverting modes are shown in Table 18-1.
| PGACTL[GAIN] | Non-inverting Gain | Inverting Gain | Ria | Rib |
|---|---|---|---|---|
| 000 | 1 | NA | 256K | 0(1) |
| 001 | 2 | -1 | 16K | 16K |
| 010 | 4 | -3 | 8K | 24K |
| 011 | 8 | -7 | 8K | 56K |
| 100 | 16 | -15 | 8K | 120K |
| 101 | 32 | -31 | 8K | 248K |
| 110 | 64 | -63 | 4K | 252K |