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Data Acqusition using TM4C123GXL launchpad with Energia

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I am developing data acquisition using TM4C123GXL with Energia. I able to acquire signal of 20hz even my ADC has  sampling rate of 1M/s.

 

I need suggestion regarding how to increase acqusition bandwidth(higher range frequency)....

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Also, if you're doing ADC reads and writing that data out to an external serial display or back to the computer, the speed of the link between the TM4C and the display / PC will slow things down. The same applies if you're sampling data and writing to an SD or Flash device: things can only go as fast as the slowest part allows.

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