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Antialiasing filter in the ADS1254

DOV M.
Prodigy 200 points
Other Parts Discussed in Thread: ADS1254

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!

  • 0
    TI__Guru* 93435 points

    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