Hello,
I am giving a sine wave from a function generator with peak-to peak of 1.8 V where min_voltage = -900mv and max voltage of 900mv. When I pass this signal to FMC 151, I expect ADC values to span almost the full range of ADC with shape of a proper sine wave.
But when I probe the signal in chipscope, I get a graph which is not a sine wave anymore. However, when a offset voltage of +1V is provided, then I get the shape of the sine wave. But the range of the received sine wave do not span the full range of the ADC. The values are only ranged from 2460 to 10111.
Please note that I probe the signal phy_out_data_0 in the reference firmware. Could anyone please explain the reason for this?
Thank you.
Paul