Filtering a signal

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Anonymous
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 Project: ADC => DMA => Filter => DMA => DAC

   

The input is provided as a DTMF waveform signal. The amplitude is in range 0.2 ..2.2 V.

   

The problem is with output signal.  The waveform is rectangular(should be as a sine). It looks like the DAC is in saturation mode.

   

Thanks.

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