SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
External signal sources vary in the ability to drive an analog signal quickly and effectively. To achieve rated resolution, the signal source needs to charge the sampling capacitor in the ADC core to within 0.5 LSBs of the signal voltage. The acquisition window is the amount of time the sampling capacitor is allowed to charge and is configurable for SOCx by the ADCSOCxCTL.ACQPS register.
ACQPS is a 9-bit register that can be set to a value between 0 and 511, resulting in an acquisition window duration of:
Acquisition window = (ACQPS + 1) ˟ (System Clock (SYSCLK) cycle time)