When designing the antialiasing filter for the ADS1254, which clk do I take into account for Fsamp/2 (the frequency above which aliasing occurs)?
Is it CLK/6 (the clock that runs the modulator) or SCLK (the data out rate)?
Thanks!
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When designing the antialiasing filter for the ADS1254, which clk do I take into account for Fsamp/2 (the frequency above which aliasing occurs)?
Is it CLK/6 (the clock that runs the modulator) or SCLK (the data out rate)?
Thanks!
If you are designing an antialiasing filter, you want to filter out any input artifacts that are higher than what your input sampling rate is.
In the ADS1254, the input is sampled at CLK/6. With an 8MHz clock, this means the input sampling frequency is 1.33MHz and you want an antialiasing filter that cuts off at half that frequency (or 667kHz).
Joseph Wu