Hello, I am using the ADS1298 to acquire signals, but I am encountering an issue. I am generating a 1 Hz sine wave with a signal generator and feeding it into channel 1 of the ADS1298.
I am using an STM32 to communicate with the ADS1298, and I have set the ADS1298 sampling rate to 500 SPS. I am instructing the ADS1298 to sample 500 points and then stop. However, on my host computer, I see multiple cycles within one second. I have not yet found the reason for this issue. The DRDY pin pulses are displayed on the oscilloscope as shown in the figure.
The raw data received by STM32 during the next acquisition is as follows:
sampleproblem.txt
ch1 value:67.762760 mark 0 second :0.000000 ch1 value:71.670346 mark 1 second :0.002000 ch1 value:76.328091 mark 2 second :0.004000 ch1 value:79.855733 mark 3 second :0.006000 ch1 value:83.216577 mark 4 second :0.008000 ch1 value:86.389738 mark 5 second :0.010000 ch1 value:89.358907 mark 6 second :0.012000 ch1 value:92.126375 mark 7 second :0.014000 ch1 value:94.679552 mark 8 second :0.016000 ch1 value:97.011858 mark 9 second :0.018000 ch1 value:99.125296 mark 10 second :0.020000 ch1 value:101.019293 mark 11 second :0.022000 ch1 value:102.669531 mark 12 second :0.024000 ch1 value:104.399878 mark 13 second :0.026000 ch1 value:105.508238 mark 14 second :0.028000 ch1 value:106.371695 mark 15 second :0.030000 ch1 value:107.001979 mark 16 second :0.032000 ch1 value:107.365901 mark 17 second :0.034000 ch1 value:107.476908 mark 18 second :0.036000 ch1 value:107.349021 mark 19 second :0.038000 ch1 value:106.973368 mark 20 second :0.040000 ch1 value:106.333930 mark 21 second :0.042000 ch1 value:105.208975 mark 22 second :0.044000 ch1 value:104.024226 mark 23 second :0.046000 ch1 value:102.607161 mark 24 second :0.048000 ch1 value:100.938612 mark 25 second :0.050000 ch1 value:99.041754 mark 26 second :0.052000 ch1 value:96.926600 mark 27 second :0.054000 ch1 value:94.571691 mark 28 second :0.056000 ch1 value:92.015081 mark 29 second :0.058000 ch1 value:89.236742 mark 30 second :0.060000 ch1 value:86.258130 mark 31 second :0.062000 ch1 value:82.264428 mark 32 second :0.064000 ch1 value:78.848653 mark 33 second :0.066000 ch1 value:75.263505 mark 34 second :0.068000 ch1 value:71.510701 mark 35 second :0.070000 ch1 value:67.595677 mark 36 second :0.072000 ch1 value:63.538746 mark 37 second :0.074000 ch1 value:59.330181 mark 38 second :0.076000 ch1 value:55.000022 mark 39 second :0.078000 ch1 value:50.546840 mark 40 second :0.080000 ch1 value:45.996383 mark 41 second :0.082000 ch1 value:40.172770 mark 42 second :0.084000 ch1 value:35.421755 mark 43 second :0.086000 ch1 value:30.606939 mark 44 second :0.088000 ch1 value:25.723745 mark 45 second :0.090000 ch1 value:20.803930 mark 46 second :0.092000 ch1 value:15.851785 mark 47 second :0.094000 ch1 value:10.881615 mark 48 second :0.096000 ch1 value:5.910302 mark 49 second :0.098000 ch1 value:0.934410 mark 50 second :0.100000 ch1 value:-4.013443 mark 51 second :0.102000 ch1 value:-10.156346 mark 52 second :0.104000 ch1 value:-15.022946 mark 53 second :0.106000 ch1 value:-19.826032 mark 54 second :0.108000 ch1 value:-24.549009 mark 55 second :0.110000 ch1 value:-29.204466 mark 56 second :0.112000 ch1 value:-33.759787 mark 57 second :0.114000 ch1 value:-38.208105 mark 58 second :0.116000 ch1 value:-42.533400 mark 59 second :0.118000 ch1 value:-46.726230 mark 60 second :0.120000 ch1 value:-50.788596 mark 61 second :0.122000 ch1 value:-55.644611 mark 62 second :0.124000 ch1 value:-59.356788 mark 63 second :0.126000 ch1 value:-62.890724 mark 64 second :0.128000 ch1 value:-66.249851 mark 65 second :0.130000 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second :0.174000 ch1 value:-79.960732 mark 88 second :0.176000 ch1 value:-77.623849 mark 89 second :0.178000 ch1 value:-74.375443 mark 90 second :0.180000 ch1 value:-71.547894 mark 91 second :0.182000 ch1 value:-68.520645 mark 92 second :0.184000 ch1 value:-65.297989 mark 93 second :0.186000 ch1 value:-61.884502 mark 94 second :0.188000 ch1 value:-58.293632 mark 95 second :0.190000 ch1 value:-54.538539 mark 96 second :0.192000 ch1 value:-50.628379 mark 97 second :0.194000 ch1 value:-46.562865 mark 98 second :0.196000 ch1 value:-41.286566 mark 99 second :0.198000 ch1 value:-36.924650 mark 100 second :0.200000 ch1 value:-32.459738 mark 101 second :0.202000 ch1 value:-27.865507 mark 102 second :0.204000 ch1 value:-23.186590 mark 103 second :0.206000 ch1 value:-18.435289 mark 104 second :0.208000 ch1 value:-13.605309 mark 105 second :0.210000 ch1 value:-8.731270 mark 106 second :0.212000 ch1 value:-3.814316 mark 107 second :0.214000 ch1 value:2.375794 mark 108 second :0.216000 ch1 value:7.357407 mark 109 second :0.218000 ch1 value:12.327863 mark 110 second :0.220000 ch1 value:17.289735 mark 111 second :0.222000 ch1 value:22.234727 mark 112 second :0.224000 ch1 value:27.140238 mark 113 second :0.226000 ch1 value:32.010843 mark 114 second :0.228000 ch1 value:36.807921 mark 115 second :0.230000 ch1 value:41.538909 mark 116 second :0.232000 ch1 value:47.329333 mark 117 second :0.234000 ch1 value:51.853183 mark 118 second :0.236000 ch1 value:56.275180 mark 119 second :0.238000 ch1 value:60.563854 mark 120 second :0.240000 ch1 value:64.724354 mark 121 second :0.242000 ch1 value:68.754677 mark 122 second :0.244000 ch1 value:72.623066 mark 123 second :0.246000 ch1 value:76.322942 mark 124 second :0.248000 ch1 value:79.859452 mark 125 second :0.250000 ch1 value:84.025674 mark 126 second :0.252000 ch1 value:87.149053 mark 127 second :0.254000 ch1 value:90.074449 mark 128 second :0.256000 ch1 value:92.779833 mark 129 second :0.258000 ch1 value:95.281797 mark 130 second 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:0.346000 ch1 value:-11.372567 mark 174 second :0.348000 ch1 value:-16.228868 mark 175 second :0.350000 ch1 value:-21.013357 mark 176 second :0.352000 ch1 value:-25.720884 mark 177 second :0.354000 ch1 value:-31.492426 mark 178 second :0.356000 ch1 value:-35.984518 mark 179 second :0.358000 ch1 value:-40.379622 mark 180 second :0.360000 ch1 value:-44.643405 mark 181 second :0.362000 ch1 value:-48.778155 mark 182 second :0.364000 ch1 value:-52.755550 mark 183 second :0.366000 ch1 value:-56.590751 mark 184 second :0.368000 ch1 value:-60.254005 mark 185 second :0.370000 ch1 value:-63.751892 mark 186 second :0.372000 ch1 value:-67.857174 mark 187 second :0.374000 ch1 value:-70.929627 mark 188 second :0.376000 ch1 value:-73.796086 mark 189 second :0.378000 ch1 value:-76.454263 mark 190 second :0.380000 ch1 value:-78.904443 mark 191 second :0.382000 ch1 value:-81.118302 mark 192 second :0.384000 ch1 value:-83.130174 mark 193 second :0.386000 ch1 value:-84.902005 mark 194 second :0.388000 ch1 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second :0.474000 ch1 value:43.861487 mark 238 second :0.476000 ch1 value:48.466590 mark 239 second :0.478000 ch1 value:54.068473 mark 240 second :0.480000 ch1 value:58.427528 mark 241 second :0.482000 ch1 value:62.659840 mark 242 second :0.484000 ch1 value:66.752533 mark 243 second :0.486000 ch1 value:70.701889 mark 244 second :0.488000 ch1 value:74.482731 mark 245 second :0.490000 ch1 value:78.104215 mark 246 second :0.492000 ch1 value:81.549459 mark 247 second :0.494000 ch1 value:84.823327 mark 248 second :0.496000 ch1 value:88.626771 mark 249 second :0.498000 ch1 value:91.441732 mark 250 second :0.500000 ch1 value:94.055563 mark 251 second :0.502000 ch1 value:96.451670 mark 252 second :0.504000 ch1 value:98.616892 mark 253 second :0.506000 ch1 value:100.559527 mark 254 second :0.508000 ch1 value:102.276999 mark 255 second :0.510000 ch1 value:103.750140 mark 256 second :0.512000 ch1 value:104.981810 mark 257 second :0.514000 ch1 value:106.175715 mark 258 second :0.516000 ch1 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second :0.560000 ch1 value:60.398201 mark 281 second :0.562000 ch1 value:56.102088 mark 282 second :0.564000 ch1 value:50.547698 mark 283 second :0.566000 ch1 value:46.001819 mark 284 second :0.568000 ch1 value:41.354086 mark 285 second :0.570000 ch1 value:36.608221 mark 286 second :0.572000 ch1 value:31.826879 mark 287 second :0.574000 ch1 value:26.954271 mark 288 second :0.576000 ch1 value:22.043611 mark 289 second :0.578000 ch1 value:17.104341 mark 290 second :0.580000 ch1 value:12.143040 mark 291 second :0.582000 ch1 value:5.916882 mark 292 second :0.584000 ch1 value:0.943852 mark 293 second :0.586000 ch1 value:-4.003716 mark 294 second :0.588000 ch1 value:-8.926678 mark 295 second :0.590000 ch1 value:-13.799573 mark 296 second :0.592000 ch1 value:-18.622972 mark 297 second :0.594000 ch1 value:-23.370840 mark 298 second :0.596000 ch1 value:-28.037740 mark 299 second :0.598000 ch1 value:-32.624819 mark 300 second :0.600000 ch1 value:-38.194945 mark 301 second :0.602000 ch1 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