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ADS1192IRSMR Datasheet(PDF) 21 Page - Texas Instruments |
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ADS1192IRSMR Datasheet(HTML) 21 Page - Texas Instruments |
21 / 67 page 0 20 40 60 80 100 120 140 - - - - - - - Normalized Frequency (f /f ) IN MOD 0.05 0.1 0 0.5 0.15 0.2 0.25 0.3 0.35 0.4 0.45 DR[0:2] = 000 DR[0:2] = 110 0 20 40 60 80 100 120 140 - - - - - - - Normalized Frequency (f /f ) IN MOD 0.01 0 0.07 0.02 0.03 0.04 0.05 0.06 DR[0:2] = 110 DR[0:2] = 000 0 -20 -40 -60 -80 -100 -120 -140 Normalized Frequency (f /f ) IN DR 1 2 0 3 4 5 0.5 4.5 3.5 2.5 1.5 0 0.5 1 1.5 2 2.5 3 - - - - - - Normalized Frequency (f /f ) IN DR 0.05 0.1 0 0.15 0.35 0.2 0.25 0.3 ADS1191 ADS1192 www.ti.com SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012 The sinc filter has notches (or zeroes) that occur at the output data rate and multiples thereof. At these frequencies, the filter has infinite attenuation. Figure 21 shows the frequency response of the sinc filter and Figure 22 shows the roll-off of the sinc filter. With a step change at input, the filter takes 3 tDR to settle. After a rising edge of the START signal, the filter takes tSETTLE time to give the first data output. The settling time of the filters at various data rates are discussed in the START subsection of the SPI Interface section. Figure 23 and Figure 24 show the filter transfer function until fMOD/2 and fMOD/16, respectively, at different data rates. Figure 25 shows the transfer function extended until 4 fMOD. It can be seen that the passband of the ADS1191/2 repeats itself at every fMOD. The input R-C anti-aliasing filters in the system should be chosen such that any interference in frequencies around multiples of fMOD are attenuated sufficiently. Figure 21. THD vs Frequency Figure 22. INL vs PGA Gain Figure 23. Transfer Function of On-Chip Figure 24. Transfer Function of On-Chip Decimation Filters Until fMOD/2 Decimation Filters Until fMOD/16 Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: ADS1191 ADS1192 |
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