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Regarding Analog Input to AD7612


We are using AD7612 16-bit ADC. We are giving Analog Inputs from Signal generator of 1Khz signal with 3V Peak to Peak Amplitude. We are unable to get enough samples. We are using Slave Serial Interface read  after convert mode. Serial Clock(SDCLK) is 20 Mhz while reading. When we try to plot it in Bus Plot we are unable to get Sine wave. I am attaching Schematics of AD7612 in our design and my source code. Please let us know where we are missing.

Thanks and Regards,

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