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How to choose the right sampling rate？

ZZZT
Intellectual 340 points

1.I currently want to choose a 16-bit SAR ADC, how should I choose my sampling rate? My input signal frequency is 75khz，Does it only need to be greater than twice the signal rate?

2.If I want to use AMC1306 (Δ-Σ ADC) and C200 (Sigma Delta Filter Module) sinc3. What is the maximum signal frequency?

  • 0
    TI__Guru 55322 points

    Hi,

    1. To satisfy nyquist sampling theorem, the sampling rate must be at least 2x the frequency of the input signal. However, you may want to sample at an even faster rate (4x, 8x, 10x.. etc) it order to produce a more accurate output depending on your system requirements. 

    2. The AMC1306 is an isolated modulator that outputs a digital bitstream that is fed to a sigma delta filter module. This filter has the advantage of being flexible and can be configured in many different ways depending on your system requirements. The bandwidth of the acquisition can increase at the expense of accuracy - typically up to 1MHz. Please see this paper (table 2) for more details: www.ti.com/.../sbaa359a.pdf