Hi Sureshkumarv,
Regarding the two SPI writes for digital reset, if this fixes what you are seeing, then you would either:
- need to identify in your system and fix whatever is interrupting the AD9648 initialization routone, or
- do the digital reset after every power up.
Thank you for sending the waveforms. In general we see some expected behavior (e.g. signal activity moving to lower bits as amplitude is reduced), but there are still some unexpected things, such as Bits[13:7] all toggling the same at -28dBm.
Is it possible for you to send a picture of your output in frequency domain, like in an FFT? How are you processing the data to calculate an SNR number? If you cannot send an FFT, can you send raw sample data? This would be a column of data (32k or 64k values) representing the ADC output values.
Please let me know if you can provide either of these, and if the digital reset makes any difference.
Thank you.
Doug