05-15-2019 08:20 PM
I got the result for XADC , I applied a continuous sine wave signal to the dedicated pin Vp and Vn. I have debugged the value.
I noticed the result is from 0000h to 7fffh only, but my input signal is from 0 to 1V , with 500 mv Vn offset
I have attached the ILA window also, what could be the reason for my output only from 0 to 0.5V
Fig: 1 ---Interface, channel, timing mode and DCLK freq
Fig: 2 ---Bipolar Enabling
Fig: 3 ---- ILA Window
05-24-2019 03:12 PM
Would you please repost the images from your previous post? None of them have been correclt uploaded so we can't see it. That would greatly help us in understanding and debugging the issue.
05-25-2019 05:15 AM
Sorry for the error in images.I will upload again
I have attached my unipolar xadc output signal. Kindly check it off, the same deformation of voltage is there.
1) UNIPOLAR MODE : Vp sinput signal is 0 to 1V, with offset of 500mV.
Vn is from DAC B, default value is 0V.
Freq from generator is 10Khz
I don't understand why there is only 0.93V max and 0.3V minimum.
2) If I reduce the frequency , the ADC code gets increases like this. But its really look no meaning how it happens, why there is a indirect proportional to frequency and voltage. It may be due to any anti aliasing filter effects. I don't know exactly.
If it is due to the low pass filter, how to reduce it. At final stage my input to the ADC will be a high frequency signal. So it is neccessary to reduce the effect.
I ahve atatched the XADC output for various input frequency.