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Change ads1298 sampling rate using pc software

Muhammad Abdullah
Prodigy 60 points
Other Parts Discussed in Thread: ADS1298

Hi,

I am using Ads1298pdk and its pc software to obtain EMG signals and process them. I am getting a lot of power noise at 50 Hz and its harmonics and I need to minimize it somehow. Now I know there are notch filters at 50/60 Hz but they don't work to solve the problem. I have two questions, first is can I change the sampling rate of ads1298 from software? If yes how? Second thing is why notch filters implemented in software aren't working on signals.

A screenshot of power noise corrupted signal is attached.

Regards,

Abdullah

  • 0
    Prodigy 150 points

    hi Muhammad

    can you do it from your control panel EVM? the upper Samples/CH box

    I'm evaluating the same board for another application, but I'm currently having issues with the PGA gain, apparently if you control these correctly you can minimize noise ?? 

  • 0 in reply to rafael cruz
    Prodigy 60 points

    Hi rafael,

    I sure can change the number of samples/channel from the upper box but that is not related to noise reduction. It device samples the signals at the same rate but it changes time for reading the data if samples/CH is changed. What I want to do is change sampling rate of device, the box in the upper left corner of GUI. This rate is to be controlled via bits [2:0] of config1 register, how can i write to this register through this GUI?

    Regards,

    Abdullah

  • 0 in reply to Muhammad Abdullah
    Prodigy 150 points

    Hi Abdullah

    If you change it to low power mode and play with the Output data rate (under configuration register 1), it changes the data rate to a minimum of 250SPS, to verify you can look at the registers map for config1, its value should change.  I'm also experiencing a lot of 60Hz noise, the notch enable filters help a little but not totally.  I tried running the device from a battery pack of 6volts and just using my laptop (with it's internal re-chargeable battery).

    Rafael

  • 0 in reply to rafael cruz
    Prodigy 60 points

    Hi Rafael,

    Battery pack doesn't solve the problem. Internal notch filters help a little. My main problem is multiple peaks of power noise in frequency spectrum. I tried using comb filter to filter these peaks, but got no success. Please, some one from TI respond to this post. Tell us the way to minimize the noise interference without employing filters.