JAJSGG2C October 2018 – June 2019 ADS125H02
The digital filter processes the modulator output data to produce the high-resolution conversion result. The digital filter low-pass filters and decimates the data (data rate reduction), yielding the final data output. By adjusting the type of filtering, tradeoffs are made between resolution, data rate, and line cycle rejection.
The digital filter has two operating modes, as shown in Figure 65: sin(x) / x (sinc) mode and finite impulse response (FIR) mode. The sinc mode provides data rates of 2.5 SPS through 40 kSPS with a selectable filter order of sinc1 through sinc5. The FIR filter provides single-cycle settled conversions and simultaneous rejection of 50-Hz and 60-Hz signal interference frequencies with data rates of 2.5 SPS through 20 SPS.