JAJSF13C March 2018 – January 2019 ADS1260 , ADS1261
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The finite impulse response (FIR) filter is a coefficient based filter architecture that provides an overall low-pass filter response. The filter provides simultaneous attenuation of 50 Hz and 60 Hz and harmonics at data rates of 20 SPS to 2.5 SPS. The conversion latency time of the FIR filter data rates are single-cycle. As shown in Figure 60, the FIR filter receives pre-filtered data from the sinc filter. The FIR filter decimates the data to yield the output data rates of 20 SPS. A variable averager (sinc1) provides data rates of 10 SPS, 5 SPS, and 2.5 SPS. Table 6 lists the bandwidth of the data rates in FIR filter mode.